diff --git a/.gitignore b/.gitignore
index f8a16bc..bc62b68 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+/.phpcs-cache
 /clover.xml
 /coveralls-upload.json
 /phpunit.xml
diff --git a/composer.json b/composer.json
index 3e40031..55b8f18 100644
--- a/composer.json
+++ b/composer.json
@@ -17,6 +17,9 @@
         "forum": "https://discourse.laminas.dev"
     },
     "config": {
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true
+        },
         "sort-packages": true,
         "platform": {
             "php": "7.4.99"
@@ -39,7 +42,7 @@
         "symfony/var-dumper": "^5.0.1 || ^6.0"
     },
     "require-dev": {
-        "laminas/laminas-coding-standard": "~1.0.0",
+        "laminas/laminas-coding-standard": "~2.4.0",
         "phpunit/phpunit": "^9.3"
     },
     "suggest": {
diff --git a/composer.lock b/composer.lock
index ffd29b4..cbd438d 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "75ac174304e9420f758a70adb4b31362",
+    "content-hash": "c5f65de09d8a241704f618732917eef1",
     "packages": [
         {
             "name": "brick/varexporter",
@@ -1481,6 +1481,81 @@
         }
     ],
     "packages-dev": [
+        {
+            "name": "dealerdirect/phpcodesniffer-composer-installer",
+            "version": "v0.7.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/Dealerdirect/phpcodesniffer-composer-installer.git",
+                "reference": "1c968e542d8843d7cd71de3c5c9c3ff3ad71a1db"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/Dealerdirect/phpcodesniffer-composer-installer/zipball/1c968e542d8843d7cd71de3c5c9c3ff3ad71a1db",
+                "reference": "1c968e542d8843d7cd71de3c5c9c3ff3ad71a1db",
+                "shasum": ""
+            },
+            "require": {
+                "composer-plugin-api": "^1.0 || ^2.0",
+                "php": ">=5.3",
+                "squizlabs/php_codesniffer": "^2.0 || ^3.1.0 || ^4.0"
+            },
+            "require-dev": {
+                "composer/composer": "*",
+                "php-parallel-lint/php-parallel-lint": "^1.3.1",
+                "phpcompatibility/php-compatibility": "^9.0"
+            },
+            "type": "composer-plugin",
+            "extra": {
+                "class": "Dealerdirect\\Composer\\Plugin\\Installers\\PHPCodeSniffer\\Plugin"
+            },
+            "autoload": {
+                "psr-4": {
+                    "Dealerdirect\\Composer\\Plugin\\Installers\\PHPCodeSniffer\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Franck Nijhof",
+                    "email": "franck.nijhof@dealerdirect.com",
+                    "homepage": "http://www.frenck.nl",
+                    "role": "Developer / IT Manager"
+                },
+                {
+                    "name": "Contributors",
+                    "homepage": "https://github.com/Dealerdirect/phpcodesniffer-composer-installer/graphs/contributors"
+                }
+            ],
+            "description": "PHP_CodeSniffer Standards Composer Installer Plugin",
+            "homepage": "http://www.dealerdirect.com",
+            "keywords": [
+                "PHPCodeSniffer",
+                "PHP_CodeSniffer",
+                "code quality",
+                "codesniffer",
+                "composer",
+                "installer",
+                "phpcbf",
+                "phpcs",
+                "plugin",
+                "qa",
+                "quality",
+                "standard",
+                "standards",
+                "style guide",
+                "stylecheck",
+                "tests"
+            ],
+            "support": {
+                "issues": "https://github.com/dealerdirect/phpcodesniffer-composer-installer/issues",
+                "source": "https://github.com/dealerdirect/phpcodesniffer-composer-installer"
+            },
+            "time": "2022-02-04T12:51:07+00:00"
+        },
         {
             "name": "doctrine/instantiator",
             "version": "1.4.1",
@@ -1553,31 +1628,39 @@
         },
         {
             "name": "laminas/laminas-coding-standard",
-            "version": "1.0.0",
+            "version": "2.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/laminas/laminas-coding-standard.git",
-                "reference": "08880ce2fbfe62d471cd3cb766a91da630b32539"
+                "reference": "eb076dd86aa93dd424856b150c9b6f76c1fdfabc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laminas/laminas-coding-standard/zipball/08880ce2fbfe62d471cd3cb766a91da630b32539",
-                "reference": "08880ce2fbfe62d471cd3cb766a91da630b32539",
+                "url": "https://api.github.com/repos/laminas/laminas-coding-standard/zipball/eb076dd86aa93dd424856b150c9b6f76c1fdfabc",
+                "reference": "eb076dd86aa93dd424856b150c9b6f76c1fdfabc",
                 "shasum": ""
             },
             "require": {
-                "laminas/laminas-zendframework-bridge": "^1.0",
-                "squizlabs/php_codesniffer": "^2.7"
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.7",
+                "php": "^7.4 || ^8.0",
+                "slevomat/coding-standard": "^7.0",
+                "squizlabs/php_codesniffer": "^3.6",
+                "webimpress/coding-standard": "^1.2"
             },
-            "replace": {
-                "zendframework/zend-coding-standard": "self.version"
+            "conflict": {
+                "phpstan/phpdoc-parser": ">=1.6.0"
+            },
+            "type": "phpcodesniffer-standard",
+            "autoload": {
+                "psr-4": {
+                    "LaminasCodingStandard\\": "src/LaminasCodingStandard/"
+                }
             },
-            "type": "library",
             "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "BSD-3-Clause"
             ],
-            "description": "Laminas coding standard",
+            "description": "Laminas Coding Standard",
             "homepage": "https://laminas.dev",
             "keywords": [
                 "Coding Standard",
@@ -1591,69 +1674,13 @@
                 "rss": "https://github.com/laminas/laminas-coding-standard/releases.atom",
                 "source": "https://github.com/laminas/laminas-coding-standard"
             },
-            "time": "2019-12-31T16:28:26+00:00"
-        },
-        {
-            "name": "laminas/laminas-zendframework-bridge",
-            "version": "1.6.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/laminas/laminas-zendframework-bridge.git",
-                "reference": "e112dd2c099f4f6142c16fc65fda89a638e06885"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/laminas/laminas-zendframework-bridge/zipball/e112dd2c099f4f6142c16fc65fda89a638e06885",
-                "reference": "e112dd2c099f4f6142c16fc65fda89a638e06885",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.4, <8.2"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^9.5.14",
-                "psalm/plugin-phpunit": "^0.15.2",
-                "squizlabs/php_codesniffer": "^3.6.2",
-                "vimeo/psalm": "^4.21.0"
-            },
-            "type": "library",
-            "extra": {
-                "laminas": {
-                    "module": "Laminas\\ZendFrameworkBridge"
-                }
-            },
-            "autoload": {
-                "files": [
-                    "src/autoload.php"
-                ],
-                "psr-4": {
-                    "Laminas\\ZendFrameworkBridge\\": "src//"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "description": "Alias legacy ZF class names to Laminas Project equivalents.",
-            "keywords": [
-                "ZendFramework",
-                "autoloading",
-                "laminas",
-                "zf"
-            ],
-            "support": {
-                "forum": "https://discourse.laminas.dev/",
-                "issues": "https://github.com/laminas/laminas-zendframework-bridge/issues",
-                "rss": "https://github.com/laminas/laminas-zendframework-bridge/releases.atom",
-                "source": "https://github.com/laminas/laminas-zendframework-bridge"
-            },
             "funding": [
                 {
                     "url": "https://funding.communitybridge.org/projects/laminas-project",
                     "type": "community_bridge"
                 }
             ],
-            "time": "2022-07-29T13:28:29+00:00"
+            "time": "2022-08-24T17:45:47+00:00"
         },
         {
             "name": "myclabs/deep-copy",
@@ -1825,6 +1852,50 @@
             },
             "time": "2022-02-21T01:04:05+00:00"
         },
+        {
+            "name": "phpstan/phpdoc-parser",
+            "version": "1.5.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpdoc-parser.git",
+                "reference": "981cc368a216c988e862a75e526b6076987d1b50"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpdoc-parser/zipball/981cc368a216c988e862a75e526b6076987d1b50",
+                "reference": "981cc368a216c988e862a75e526b6076987d1b50",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "require-dev": {
+                "php-parallel-lint/php-parallel-lint": "^1.2",
+                "phpstan/extension-installer": "^1.0",
+                "phpstan/phpstan": "^1.5",
+                "phpstan/phpstan-strict-rules": "^1.0",
+                "phpunit/phpunit": "^9.5",
+                "symfony/process": "^5.2"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "PHPStan\\PhpDocParser\\": [
+                        "src/"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPDoc parser with support for nullable, intersection and generic types",
+            "support": {
+                "issues": "https://github.com/phpstan/phpdoc-parser/issues",
+                "source": "https://github.com/phpstan/phpdoc-parser/tree/1.5.1"
+            },
+            "time": "2022-05-05T11:32:40+00:00"
+        },
         {
             "name": "phpunit/php-code-coverage",
             "version": "9.2.17",
@@ -3205,66 +3276,100 @@
             ],
             "time": "2020-09-28T06:39:44+00:00"
         },
+        {
+            "name": "slevomat/coding-standard",
+            "version": "7.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/slevomat/coding-standard.git",
+                "reference": "aff06ae7a84e4534bf6f821dc982a93a5d477c90"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/slevomat/coding-standard/zipball/aff06ae7a84e4534bf6f821dc982a93a5d477c90",
+                "reference": "aff06ae7a84e4534bf6f821dc982a93a5d477c90",
+                "shasum": ""
+            },
+            "require": {
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.6.2 || ^0.7",
+                "php": "^7.2 || ^8.0",
+                "phpstan/phpdoc-parser": "^1.5.1",
+                "squizlabs/php_codesniffer": "^3.6.2"
+            },
+            "require-dev": {
+                "phing/phing": "2.17.3",
+                "php-parallel-lint/php-parallel-lint": "1.3.2",
+                "phpstan/phpstan": "1.4.10|1.7.1",
+                "phpstan/phpstan-deprecation-rules": "1.0.0",
+                "phpstan/phpstan-phpunit": "1.0.0|1.1.1",
+                "phpstan/phpstan-strict-rules": "1.2.3",
+                "phpunit/phpunit": "7.5.20|8.5.21|9.5.20"
+            },
+            "type": "phpcodesniffer-standard",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "7.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "SlevomatCodingStandard\\": "SlevomatCodingStandard"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Slevomat Coding Standard for PHP_CodeSniffer complements Consistence Coding Standard by providing sniffs with additional checks.",
+            "support": {
+                "issues": "https://github.com/slevomat/coding-standard/issues",
+                "source": "https://github.com/slevomat/coding-standard/tree/7.2.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/kukulich",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/slevomat/coding-standard",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-05-25T10:58:12+00:00"
+        },
         {
             "name": "squizlabs/php_codesniffer",
-            "version": "2.9.2",
+            "version": "3.7.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
-                "reference": "2acf168de78487db620ab4bc524135a13cfe6745"
+                "reference": "1359e176e9307e906dc3d890bcc9603ff6d90619"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/2acf168de78487db620ab4bc524135a13cfe6745",
-                "reference": "2acf168de78487db620ab4bc524135a13cfe6745",
+                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/1359e176e9307e906dc3d890bcc9603ff6d90619",
+                "reference": "1359e176e9307e906dc3d890bcc9603ff6d90619",
                 "shasum": ""
             },
             "require": {
                 "ext-simplexml": "*",
                 "ext-tokenizer": "*",
                 "ext-xmlwriter": "*",
-                "php": ">=5.1.2"
+                "php": ">=5.4.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.0"
+                "phpunit/phpunit": "^4.0 || ^5.0 || ^6.0 || ^7.0"
             },
             "bin": [
-                "scripts/phpcs",
-                "scripts/phpcbf"
+                "bin/phpcs",
+                "bin/phpcbf"
             ],
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.x-dev"
+                    "dev-master": "3.x-dev"
                 }
             },
-            "autoload": {
-                "classmap": [
-                    "CodeSniffer.php",
-                    "CodeSniffer/CLI.php",
-                    "CodeSniffer/Exception.php",
-                    "CodeSniffer/File.php",
-                    "CodeSniffer/Fixer.php",
-                    "CodeSniffer/Report.php",
-                    "CodeSniffer/Reporting.php",
-                    "CodeSniffer/Sniff.php",
-                    "CodeSniffer/Tokens.php",
-                    "CodeSniffer/Reports/",
-                    "CodeSniffer/Tokenizers/",
-                    "CodeSniffer/DocGenerators/",
-                    "CodeSniffer/Standards/AbstractPatternSniff.php",
-                    "CodeSniffer/Standards/AbstractScopeSniff.php",
-                    "CodeSniffer/Standards/AbstractVariableSniff.php",
-                    "CodeSniffer/Standards/IncorrectPatternException.php",
-                    "CodeSniffer/Standards/Generic/Sniffs/",
-                    "CodeSniffer/Standards/MySource/Sniffs/",
-                    "CodeSniffer/Standards/PEAR/Sniffs/",
-                    "CodeSniffer/Standards/PSR1/Sniffs/",
-                    "CodeSniffer/Standards/PSR2/Sniffs/",
-                    "CodeSniffer/Standards/Squiz/Sniffs/",
-                    "CodeSniffer/Standards/Zend/Sniffs/"
-                ]
-            },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "BSD-3-Clause"
@@ -3276,7 +3381,7 @@
                 }
             ],
             "description": "PHP_CodeSniffer tokenizes PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.",
-            "homepage": "http://www.squizlabs.com/php-codesniffer",
+            "homepage": "https://github.com/squizlabs/PHP_CodeSniffer",
             "keywords": [
                 "phpcs",
                 "standards"
@@ -3286,7 +3391,7 @@
                 "source": "https://github.com/squizlabs/PHP_CodeSniffer",
                 "wiki": "https://github.com/squizlabs/PHP_CodeSniffer/wiki"
             },
-            "time": "2018-11-07T22:31:41+00:00"
+            "time": "2022-06-18T07:21:10+00:00"
         },
         {
             "name": "theseer/tokenizer",
@@ -3337,6 +3442,61 @@
                 }
             ],
             "time": "2021-07-28T10:34:58+00:00"
+        },
+        {
+            "name": "webimpress/coding-standard",
+            "version": "1.2.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webimpress/coding-standard.git",
+                "reference": "cd0c4b0b97440c337c1f7da17b524674ca2f9ca9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webimpress/coding-standard/zipball/cd0c4b0b97440c337c1f7da17b524674ca2f9ca9",
+                "reference": "cd0c4b0b97440c337c1f7da17b524674ca2f9ca9",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.3 || ^8.0",
+                "squizlabs/php_codesniffer": "^3.6.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.5.13"
+            },
+            "type": "phpcodesniffer-standard",
+            "extra": {
+                "dev-master": "1.2.x-dev",
+                "dev-develop": "1.3.x-dev"
+            },
+            "autoload": {
+                "psr-4": {
+                    "WebimpressCodingStandard\\": "src/WebimpressCodingStandard/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-2-Clause"
+            ],
+            "description": "Webimpress Coding Standard",
+            "keywords": [
+                "Coding Standard",
+                "PSR-2",
+                "phpcs",
+                "psr-12",
+                "webimpress"
+            ],
+            "support": {
+                "issues": "https://github.com/webimpress/coding-standard/issues",
+                "source": "https://github.com/webimpress/coding-standard/tree/1.2.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/michalbundyra",
+                    "type": "github"
+                }
+            ],
+            "time": "2022-02-15T19:52:12+00:00"
         }
     ],
     "aliases": [],
diff --git a/config/module.config.php b/config/module.config.php
index 6a0b8b1..37ce6b1 100644
--- a/config/module.config.php
+++ b/config/module.config.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 return [
     'view_manager' => [
         'template_path_stack' => [
diff --git a/phpcs.xml b/phpcs.xml
index 0310a7b..0f279ea 100644
--- a/phpcs.xml
+++ b/phpcs.xml
@@ -1,10 +1,22 @@
 <?xml version="1.0"?>
-<ruleset name="Laminas coding standard">
-    <rule ref="./vendor/laminas/laminas-coding-standard/ruleset.xml"/>
+<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="vendor/squizlabs/php_codesniffer/phpcs.xsd">
+
+    <arg name="basepath" value="."/>
+    <arg name="cache" value=".phpcs-cache"/>
+    <arg name="colors"/>
+    <arg name="extensions" value="php"/>
+    <arg name="parallel" value="80"/>
+
+    <!-- Show progress -->
+    <arg value="p"/>
 
     <!-- Paths to check -->
-    <file>src</file>
-    <file>test</file>
     <file>config/module.config.php</file>
     <file>config/laminas-developer-tools.local.php.dist</file>
+    <file>src</file>
+    <file>test</file>
+
+    <!-- Include all rules from the Laminas Coding Standard -->
+    <rule ref="LaminasCodingStandard"/>
 </ruleset>
diff --git a/src/Collector/AbstractCollector.php b/src/Collector/AbstractCollector.php
index 39728b5..0883f75 100644
--- a/src/Collector/AbstractCollector.php
+++ b/src/Collector/AbstractCollector.php
@@ -1,12 +1,16 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Collector;
 
 use Serializable;
 
+use function serialize;
+use function unserialize;
+
 /**
  * Serializable Collector base class.
- *
  */
 abstract class AbstractCollector implements CollectorInterface, Serializable
 {
@@ -17,6 +21,9 @@ abstract class AbstractCollector implements CollectorInterface, Serializable
      */
     protected $data;
 
+    /**
+     * @return string
+     */
     public function __serialize()
     {
         return serialize($this->data);
@@ -25,12 +32,18 @@ public function __serialize()
     /**
      * @deprecated since 2.3.0, this method will be removed in version 3.0.0 of this component.
      *             {@see Serializable} as alternative
+     *
+     * @inheritDoc
      */
     public function serialize()
     {
         return $this->__serialize();
     }
 
+    /**
+     * @param string $data
+     * @return void
+     */
     public function __unserialize($data)
     {
         $this->data = unserialize($data);
@@ -39,6 +52,8 @@ public function __unserialize($data)
     /**
      * @deprecated since 2.3.0, this method will be removed in version 3.0.0 of this component.
      *             {@see Serializable} as alternative
+     *
+     * @inheritDoc
      */
     public function unserialize($data)
     {
diff --git a/src/Collector/AutoHideInterface.php b/src/Collector/AutoHideInterface.php
index 08185fe..210fddb 100644
--- a/src/Collector/AutoHideInterface.php
+++ b/src/Collector/AutoHideInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Collector;
 
 /**
diff --git a/src/Collector/CollectorInterface.php b/src/Collector/CollectorInterface.php
index 4090f74..8f9e9ea 100644
--- a/src/Collector/CollectorInterface.php
+++ b/src/Collector/CollectorInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Collector;
 
 use Laminas\Mvc\MvcEvent;
@@ -25,8 +27,6 @@ public function getPriority();
 
     /**
      * Collects data.
-     *
-     * @param MvcEvent $mvcEvent
      */
     public function collect(MvcEvent $mvcEvent);
 }
diff --git a/src/Collector/ConfigCollector.php b/src/Collector/ConfigCollector.php
index c9c9709..5c5e33f 100644
--- a/src/Collector/ConfigCollector.php
+++ b/src/Collector/ConfigCollector.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Collector;
 
 use Closure;
@@ -9,26 +11,26 @@
 use Serializable;
 use Traversable;
 
+use function is_array;
+use function serialize;
+use function unserialize;
+
 /**
  * Config data collector - dumps the contents of the `Config` and `ApplicationConfig` services
  */
 class ConfigCollector implements CollectorInterface, Serializable
 {
-    const NAME     = 'config';
-    const PRIORITY = 100;
+    public const NAME     = 'config';
+    public const PRIORITY = 100;
 
-    /**
-     * @var array|null
-     */
+    /** @var array|null */
     protected $config;
 
-    /**
-     * @var array|null
-     */
+    /** @var array|null */
     protected $applicationConfig;
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getName()
     {
@@ -36,7 +38,7 @@ public function getName()
     }
 
     /**
-     * {@inheritDoc}
+     * @inheritDoc
      */
     public function getPriority()
     {
@@ -44,7 +46,7 @@ public function getPriority()
     }
 
     /**
-     * {@inheritDoc}
+     * @inheritDoc
      */
     public function collect(MvcEvent $mvcEvent)
     {
@@ -79,6 +81,9 @@ public function getApplicationConfig()
         return isset($this->applicationConfig) ? $this->unserializeArray($this->applicationConfig) : null;
     }
 
+    /**
+     * @return string
+     */
     public function __serialize()
     {
         return serialize(['config' => $this->config, 'applicationConfig' => $this->applicationConfig]);
@@ -87,12 +92,18 @@ public function __serialize()
     /**
      * @deprecated since 2.3.0, this method will be removed in version 3.0.0 of this component.
      *             {@see Serializable} as alternative
+     *
+     * @inheritDoc
      */
     public function serialize()
     {
         return $this->__serialize();
     }
 
+    /**
+     * @param string $serialized
+     * @return void
+     */
     public function __unserialize($serialized)
     {
         $data                    = unserialize($serialized);
@@ -103,6 +114,8 @@ public function __unserialize($serialized)
     /**
      * @deprecated since 2.3.0, this method will be removed in version 3.0.0 of this component.
      *             {@see Serializable} as alternative
+     *
+     * @inheritDoc
      */
     public function unserialize($serialized)
     {
@@ -112,7 +125,7 @@ public function unserialize($serialized)
     /**
      * Replaces the un-serializable items in an array with stubs
      *
-     * @param array|\Traversable $data
+     * @param array|Traversable $data
      * @return array
      */
     private function makeArraySerializable($data)
diff --git a/src/Collector/DbCollector.php b/src/Collector/DbCollector.php
index 71a287f..7c0e8c4 100644
--- a/src/Collector/DbCollector.php
+++ b/src/Collector/DbCollector.php
@@ -1,23 +1,27 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Collector;
 
 use BjyProfiler\Db\Profiler\Profiler;
 use Laminas\Mvc\MvcEvent;
 use Serializable;
 
+use function count;
+use function serialize;
+use function unserialize;
+
 /**
  * Database (Laminas\Db) Data Collector.
  */
 class DbCollector implements CollectorInterface, AutoHideInterface, Serializable
 {
-    /**
-     * @var Profiler
-     */
+    /** @var Profiler */
     protected $profiler;
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getName()
     {
@@ -25,7 +29,7 @@ public function getName()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getPriority()
     {
@@ -33,14 +37,14 @@ public function getPriority()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function collect(MvcEvent $mvcEvent)
     {
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function canHide()
     {
@@ -78,7 +82,6 @@ public function getProfiler()
     /**
      * Sets Bjy's Db Profiler
      *
-     * @param  Profiler $profiler
      * @return self
      */
     public function setProfiler(Profiler $profiler)
@@ -121,6 +124,9 @@ public function getQueryTime($mode = null)
         return $time;
     }
 
+    /**
+     * @return string
+     */
     public function __serialize()
     {
         return serialize($this->profiler);
@@ -129,12 +135,18 @@ public function __serialize()
     /**
      * @deprecated since 2.3.0, this method will be removed in version 3.0.0 of this component.
      *             {@see Serializable} as alternative
+     *
+     * @inheritDoc
      */
     public function serialize()
     {
         return $this->__serialize();
     }
 
+    /**
+     * @param string $profiler
+     * @return void
+     */
     public function __unserialize($profiler)
     {
         $this->profiler = unserialize($profiler);
@@ -143,6 +155,8 @@ public function __unserialize($profiler)
     /**
      * @deprecated since 2.3.0, this method will be removed in version 3.0.0 of this component.
      *             {@see Serializable} as alternative
+     *
+     * @inheritDoc
      */
     public function unserialize($profiler)
     {
diff --git a/src/Collector/EventCollectorInterface.php b/src/Collector/EventCollectorInterface.php
index 3ba060b..7d8cd06 100644
--- a/src/Collector/EventCollectorInterface.php
+++ b/src/Collector/EventCollectorInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Collector;
 
 use Laminas\EventManager\EventInterface;
@@ -13,7 +15,6 @@ interface EventCollectorInterface
      * Collects event-level information
      *
      * @param string         $id
-     * @param EventInterface $event
      */
     public function collectEvent($id, EventInterface $event);
 }
diff --git a/src/Collector/ExceptionCollector.php b/src/Collector/ExceptionCollector.php
index d2520be..e2cb577 100644
--- a/src/Collector/ExceptionCollector.php
+++ b/src/Collector/ExceptionCollector.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Collector;
 
 use Laminas\DeveloperTools\Exception\SerializableException;
@@ -12,7 +14,7 @@
 class ExceptionCollector extends AbstractCollector
 {
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getName()
     {
@@ -20,7 +22,7 @@ public function getName()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getPriority()
     {
@@ -28,13 +30,13 @@ public function getPriority()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function collect(MvcEvent $mvcEvent)
     {
         if ($mvcEvent->getError() === Application::ERROR_EXCEPTION) {
             $this->data = [
-                'exception' => new SerializableException($mvcEvent->getParam('exception'))
+                'exception' => new SerializableException($mvcEvent->getParam('exception')),
             ];
         }
     }
@@ -56,7 +58,7 @@ public function hasException()
      */
     public function hasPreviousException()
     {
-        return (isset($this->data['exception']) && $this->data['exception']->getPrevious() !== null);
+        return isset($this->data['exception']) && $this->data['exception']->getPrevious() !== null;
     }
 
     /**
diff --git a/src/Collector/MailCollector.php b/src/Collector/MailCollector.php
index da66819..ceaa1e7 100644
--- a/src/Collector/MailCollector.php
+++ b/src/Collector/MailCollector.php
@@ -1,17 +1,18 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Collector;
 
 use Laminas\Mvc\MvcEvent;
 
 /**
  * Mail Data Collector.
- *
  */
 class MailCollector extends AbstractCollector implements AutoHideInterface
 {
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getName()
     {
@@ -19,7 +20,7 @@ public function getName()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getPriority()
     {
@@ -27,7 +28,7 @@ public function getPriority()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function collect(MvcEvent $mvcEvent)
     {
@@ -35,7 +36,7 @@ public function collect(MvcEvent $mvcEvent)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function canHide()
     {
diff --git a/src/Collector/MemoryCollector.php b/src/Collector/MemoryCollector.php
index 55e4494..e57f317 100644
--- a/src/Collector/MemoryCollector.php
+++ b/src/Collector/MemoryCollector.php
@@ -1,18 +1,27 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Collector;
 
 use Laminas\DeveloperTools\EventLogging\EventContextProvider;
 use Laminas\EventManager\EventInterface;
 use Laminas\Mvc\MvcEvent;
 
+use function memory_get_peak_usage;
+use function memory_get_usage;
+use function next;
+use function prev;
+
+use const PHP_INT_MAX;
+
 /**
  * Memory Data Collector.
  */
 class MemoryCollector extends AbstractCollector implements EventCollectorInterface
 {
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getName()
     {
@@ -20,7 +29,7 @@ public function getName()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getPriority()
     {
@@ -28,7 +37,7 @@ public function getPriority()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function collect(MvcEvent $mvcEvent)
     {
@@ -37,14 +46,13 @@ public function collect(MvcEvent $mvcEvent)
         }
 
         $this->data['memory'] = memory_get_peak_usage(true);
-        $this->data['end'] = memory_get_usage(true);
+        $this->data['end']    = memory_get_usage(true);
     }
 
     /**
      * Saves the current memory usage.
      *
      * @param string         $id
-     * @param EventInterface $event
      */
     public function collectEvent($id, EventInterface $event)
     {
@@ -99,11 +107,11 @@ public function getApplicationEventMemory()
 
         $previous = null;
         foreach ($app as $name => $context) {
-            $result[$name] = $context;
-            $result[$name]['difference'] = ($previous)
-                ? ($context['memory'] - $previous['memory'])
-                : ($context['memory']);
-            $previous = prev($app);
+            $result[$name]               = $context;
+            $result[$name]['difference'] = $previous
+                ? $context['memory'] - $previous['memory']
+                : $context['memory'];
+            $previous                    = prev($app);
             next($app);
         }
 
diff --git a/src/Collector/RequestCollector.php b/src/Collector/RequestCollector.php
index c72852d..6ba6400 100644
--- a/src/Collector/RequestCollector.php
+++ b/src/Collector/RequestCollector.php
@@ -1,18 +1,32 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Collector;
 
 use Laminas\Mvc\MvcEvent;
 use Laminas\View\Model\ModelInterface;
 use Laminas\View\Variables;
 
+use function array_filter;
+use function array_pop;
+use function explode;
+use function get_class;
+use function gettype;
+use function in_array;
+use function is_object;
+use function sort;
+use function sprintf;
+
+use const ARRAY_FILTER_USE_KEY;
+
 /**
  * Request Data Collector.
  */
 class RequestCollector extends AbstractCollector
 {
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getName()
     {
@@ -20,7 +34,7 @@ public function getName()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getPriority()
     {
@@ -28,12 +42,12 @@ public function getPriority()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function collect(MvcEvent $mvcEvent)
     {
-        $views = [];
-        $match = $mvcEvent->getRouteMatch();
+        $views     = [];
+        $match     = $mvcEvent->getRouteMatch();
         $viewModel = $mvcEvent->getViewModel();
 
         $addToViewFromModel = function (ModelInterface $child) use (&$views) {
@@ -51,7 +65,7 @@ public function collect(MvcEvent $mvcEvent)
 
             $views[] = [
                 'template' => $child->getTemplate(),
-                'vars' => $vars,
+                'vars'     => $vars,
             ];
         };
 
@@ -59,20 +73,19 @@ public function collect(MvcEvent $mvcEvent)
         $this->addChildrenToView($viewModel, $addToViewFromModel);
 
         $this->data = [
-            'views'      => $views,
-            'method'     => $mvcEvent->getRequest()->getMethod(),
-            'status'     => $mvcEvent->getResponse()->getStatusCode(),
-            'route'      => ($match === null) ? 'N/A' : $match->getMatchedRouteName(),
-            'action'     => ($match === null) ? 'N/A' : $match->getParam('action', 'N/A'),
-            'controller' => ($match === null) ? 'N/A' : $match->getParam('controller', 'N/A'),
-            'other_route_parameters' => ($match === null) ? 'N/A' : array_filter($match->getParams(), function ($key) {
+            'views'                  => $views,
+            'method'                 => $mvcEvent->getRequest()->getMethod(),
+            'status'                 => $mvcEvent->getResponse()->getStatusCode(),
+            'route'                  => $match === null ? 'N/A' : $match->getMatchedRouteName(),
+            'action'                 => $match === null ? 'N/A' : $match->getParam('action', 'N/A'),
+            'controller'             => $match === null ? 'N/A' : $match->getParam('controller', 'N/A'),
+            'other_route_parameters' => $match === null ? 'N/A' : array_filter($match->getParams(), function ($key) {
                 return ! in_array($key, ['action', 'controller']);
             }, ARRAY_FILTER_USE_KEY),
         ];
     }
 
     /**
-     * @param ModelInterface $viewModel
      * @param callable $addToViewFromModel
      */
     protected function addChildrenToView(ModelInterface $viewModel, $addToViewFromModel)
@@ -139,6 +152,7 @@ public function getControllerName()
 
     /**
      * Returns parameters except controller and actions
+     *
      * @return array
      */
     public function getOtherParameters()
diff --git a/src/Collector/TimeCollector.php b/src/Collector/TimeCollector.php
index 8a40739..6747957 100644
--- a/src/Collector/TimeCollector.php
+++ b/src/Collector/TimeCollector.php
@@ -1,18 +1,28 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Collector;
 
 use Laminas\DeveloperTools\EventLogging\EventContextProvider;
 use Laminas\EventManager\EventInterface;
 use Laminas\Mvc\MvcEvent;
 
+use function defined;
+use function microtime;
+use function next;
+use function prev;
+
+use const PHP_INT_MAX;
+use const PHP_VERSION_ID;
+
 /**
  * Time Data Collector.
  */
 class TimeCollector extends AbstractCollector implements EventCollectorInterface
 {
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getName()
     {
@@ -20,7 +30,7 @@ public function getName()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getPriority()
     {
@@ -28,7 +38,7 @@ public function getPriority()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function collect(MvcEvent $mvcEvent)
     {
@@ -46,7 +56,6 @@ public function collect(MvcEvent $mvcEvent)
      * Saves the current time in microseconds for a specific event.
      *
      * @param string         $id
-     * @param EventInterface $event
      */
     public function collectEvent($id, EventInterface $event)
     {
@@ -111,11 +120,11 @@ public function getApplicationEventTimes()
 
         $previous = null;
         foreach ($app as $index => $context) {
-            $result[$index] = $context;
-            $result[$index]['elapsed'] = ($previous)
-                ? ($context['time'] - $previous['time'])
-                : ($context['time'] - $this->data['start']);
-            $previous = prev($app);
+            $result[$index]            = $context;
+            $result[$index]['elapsed'] = $previous
+                ? $context['time'] - $previous['time']
+                : $context['time'] - $this->data['start'];
+            $previous                  = prev($app);
             next($app);
         }
 
@@ -125,7 +134,6 @@ public function getApplicationEventTimes()
     /**
      * Determine the start time
      *
-     * @param MvcEvent $mvcEvent
      * @return float
      */
     private function marshalStartTime(MvcEvent $mvcEvent)
diff --git a/src/Controller/IndexController.php b/src/Controller/IndexController.php
index c77c34f..00a7e1f 100644
--- a/src/Controller/IndexController.php
+++ b/src/Controller/IndexController.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Controller;
 
 use Laminas\Mvc\Controller\AbstractActionController;
@@ -7,6 +9,9 @@
 
 class IndexController extends AbstractActionController
 {
+    /**
+     * @inheritDoc
+     */
     public function indexAction()
     {
         return new ViewModel();
diff --git a/src/EventLogging/EventContextInterface.php b/src/EventLogging/EventContextInterface.php
index d2e81ec..951409b 100644
--- a/src/EventLogging/EventContextInterface.php
+++ b/src/EventLogging/EventContextInterface.php
@@ -1,20 +1,19 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\EventLogging;
 
 use Laminas\EventManager\EventInterface;
 
 /**
  * Interface for classes that want to provide event context in the event-level collectors.
- *
- * @author Mark Garrett <mark.garrett@allcarepharmacy.com>
  */
 interface EventContextInterface
 {
     /**
      * Sets the event.
      *
-     * @param EventInterface $event
      * @return void
      */
     public function setEvent(EventInterface $event);
diff --git a/src/EventLogging/EventContextProvider.php b/src/EventLogging/EventContextProvider.php
index a34ff99..cc15e05 100644
--- a/src/EventLogging/EventContextProvider.php
+++ b/src/EventLogging/EventContextProvider.php
@@ -1,33 +1,41 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\EventLogging;
 
 use InvalidArgumentException;
 use Laminas\EventManager\EventInterface;
 
+use function array_splice;
+use function basename;
+use function debug_backtrace;
+use function dirname;
+use function file_exists;
+use function get_class;
+use function get_resource_type;
+use function gettype;
+use function is_object;
+use function is_resource;
+use function is_scalar;
+use function sprintf;
+
 /**
  * Class to provide context information for a passed event.
- *
- * @author Mark Garrett <mark.garrett@allcarepharmacy.com>
  */
 class EventContextProvider implements EventContextInterface
 {
-    /**
-     * @var EventInterface
-     */
+    /** @var EventInterface */
     protected $event;
 
-    /**
-     *
-     * @var array
-     */
+    /** @var array */
     private $debugBacktrace = [];
 
     /**
      * @param EventInterface|null $event (Optional) The event to provide context to.
      * The event must be set either here or with {@see setEvent()} before any other methods can be used.
      */
-    public function __construct(EventInterface $event = null)
+    public function __construct(?EventInterface $event = null)
     {
         if ($event) {
             $this->setEvent($event);
@@ -36,6 +44,7 @@ public function __construct(EventInterface $event = null)
 
     /**
      * @see \Laminas\DeveloperTools\EventLogging\EventContextInterface::setEvent()
+     *
      * @param  EventInterface $event The event to add context to.
      * @return void
      */
@@ -46,6 +55,7 @@ public function setEvent(EventInterface $event)
 
     /**
      * @see \Laminas\DeveloperTools\EventLogging\EventContextInterface::getEvent()
+     *
      * @return EventInterface
      */
     public function getEvent()
@@ -105,7 +115,7 @@ private function getDebugBacktrace()
     {
         if (! $this->debugBacktrace) {
             //Remove the levels this method introduces
-            $trace = debug_backtrace();
+            $trace                = debug_backtrace();
             $this->debugBacktrace = array_splice($trace, 2);
         }
 
diff --git a/src/Exception/CollectorException.php b/src/Exception/CollectorException.php
index 1db5f73..c47b93a 100644
--- a/src/Exception/CollectorException.php
+++ b/src/Exception/CollectorException.php
@@ -1,7 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Exception;
 
-class CollectorException extends \Exception implements ExceptionInterface
+use Exception;
+
+class CollectorException extends Exception implements ExceptionInterface
 {
 }
diff --git a/src/Exception/ExceptionInterface.php b/src/Exception/ExceptionInterface.php
index 57432fa..8fcefe5 100644
--- a/src/Exception/ExceptionInterface.php
+++ b/src/Exception/ExceptionInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Exception;
 
 interface ExceptionInterface
diff --git a/src/Exception/InvalidOptionException.php b/src/Exception/InvalidOptionException.php
index f49562e..4c73729 100644
--- a/src/Exception/InvalidOptionException.php
+++ b/src/Exception/InvalidOptionException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Exception;
 
 use InvalidArgumentException;
diff --git a/src/Exception/ParameterMissingException.php b/src/Exception/ParameterMissingException.php
index 5fbaba2..8484f4c 100644
--- a/src/Exception/ParameterMissingException.php
+++ b/src/Exception/ParameterMissingException.php
@@ -1,7 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Exception;
 
-class ParameterMissingException extends \Exception implements ExceptionInterface
+use Exception;
+
+class ParameterMissingException extends Exception implements ExceptionInterface
 {
 }
diff --git a/src/Exception/ProfilerException.php b/src/Exception/ProfilerException.php
index 91f22a7..ac854fd 100644
--- a/src/Exception/ProfilerException.php
+++ b/src/Exception/ProfilerException.php
@@ -1,7 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Exception;
 
-class ProfilerException extends \Exception implements ExceptionInterface
+use Exception;
+
+class ProfilerException extends Exception implements ExceptionInterface
 {
 }
diff --git a/src/Exception/SerializableException.php b/src/Exception/SerializableException.php
index 7c34334..812d85f 100644
--- a/src/Exception/SerializableException.php
+++ b/src/Exception/SerializableException.php
@@ -1,8 +1,23 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Exception;
 
 use Serializable;
+use Throwable;
+
+use function array_pop;
+use function explode;
+use function get_class;
+use function get_resource_type;
+use function implode;
+use function is_array;
+use function is_bool;
+use function is_object;
+use function is_resource;
+use function serialize;
+use function unserialize;
 
 class SerializableException implements Serializable
 {
@@ -16,7 +31,7 @@ class SerializableException implements Serializable
     /**
      * Saves the exception data in an array.
      *
-     * @param \Exception|\Throwable $exception
+     * @param Exception|Throwable $exception
      */
     public function __construct($exception)
     {
@@ -94,9 +109,6 @@ public function getPrevious()
     /**
      * This function uses code coming from Symfony 2.
      *
-     * @copyright Copyright (c) Fabien Potencier <fabien@symfony.com> (http://symfony.com/)
-     * @license   http://symfony.com/doc/current/contributing/code/license.html  MIT license
-     *
      * @param  array   $trace
      * @param  string  $file
      * @param  integer $line
@@ -118,23 +130,23 @@ protected function filterTrace($trace, $file, $line)
         ];
 
         foreach ($trace as $entry) {
-            $class = '';
+            $class     = '';
             $namespace = '';
 
             if (isset($entry['class'])) {
-                $parts = explode('\\', $entry['class']);
-                $class = array_pop($parts);
+                $parts     = explode('\\', $entry['class']);
+                $class     = array_pop($parts);
                 $namespace = implode('\\', $parts);
             }
 
             $filteredTrace[] = [
                 'namespace'   => $namespace,
                 'short_class' => $class,
-                'class'       => isset($entry['class']) ? $entry['class'] : '',
-                'type'        => isset($entry['type']) ? $entry['type'] : '',
+                'class'       => $entry['class'] ?? '',
+                'type'        => $entry['type'] ?? '',
                 'function'    => $entry['function'],
-                'file'        => isset($entry['file']) ? $entry['file'] : null,
-                'line'        => isset($entry['line']) ? $entry['line'] : null,
+                'file'        => $entry['file'] ?? null,
+                'line'        => $entry['line'] ?? null,
                 'args'        => isset($entry['args']) ? $this->filterArgs($entry['args']) : [],
             ];
         }
@@ -145,9 +157,6 @@ protected function filterTrace($trace, $file, $line)
     /**
      * This function uses code coming from Symfony 2.
      *
-     * @copyright Copyright (c) Fabien Potencier <fabien@symfony.com> (http://symfony.com/)
-     * @license   http://symfony.com/doc/current/contributing/code/license.html  MIT license
-     *
      * @param  array   $args
      * @param  integer $level
      * @return array
@@ -192,6 +201,9 @@ protected function filterArgs($args, $level = 0)
         return $result;
     }
 
+    /**
+     * @return string
+     */
     public function __serialize()
     {
         return serialize($this->data);
@@ -200,12 +212,18 @@ public function __serialize()
     /**
      * @deprecated since 2.3.0, this method will be removed in version 3.0.0 of this component.
      *             {@see Serializable} as alternative
+     *
+     * @inheritDoc
      */
     public function serialize()
     {
         return $this->__serialize();
     }
 
+    /**
+     * @param string $data
+     * @return void
+     */
     public function __unserialize($data)
     {
         $this->data = unserialize($data);
@@ -214,6 +232,8 @@ public function __unserialize($data)
     /**
      * @deprecated since 2.3.0, this method will be removed in version 3.0.0 of this component.
      *             {@see Serializable} as alternative
+     *
+     * @inheritDoc
      */
     public function unserialize($data)
     {
diff --git a/src/Listener/EventLoggingListenerAggregate.php b/src/Listener/EventLoggingListenerAggregate.php
index c50a10e..88d1265 100644
--- a/src/Listener/EventLoggingListenerAggregate.php
+++ b/src/Listener/EventLoggingListenerAggregate.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Listener;
 
 use Laminas\DeveloperTools\Collector\CollectorInterface;
@@ -9,33 +11,29 @@
 use Laminas\EventManager\SharedEventManagerInterface;
 use Laminas\ServiceManager\Exception\ServiceNotFoundException;
 
+use function array_map;
+use function array_values;
+
 /**
  * Listens to defined events to allow event-level collection of statistics.
  *
- * @author Mark Garrett <mark@moderndeveloperllc.com>
  * @since 0.0.3
  */
 class EventLoggingListenerAggregate
 {
-    /**
-     * @var EventCollectorInterface[]
-     */
+    /** @var EventCollectorInterface[] */
     protected $collectors;
 
-    /**
-     * @var string[] The event identifiers to collect
-     */
+    /** @var string[] The event identifiers to collect */
     protected $identifiers;
 
     /**
-     * Constructor.
-     *
      * @param EventCollectorInterface[] $collectors
      * @param string[]                                                $identifiers
      */
     public function __construct(array $collectors, array $identifiers)
     {
-        $this->collectors = array_map(
+        $this->collectors  = array_map(
             function (CollectorInterface $collector) {
                 return $collector;
             },
@@ -50,7 +48,9 @@ function ($identifier) {
     }
 
     /**
-     * {@inheritdoc}
+     * Attach events to a shared event manager
+     *
+     * @return void
      */
     public function attachShared(SharedEventManagerInterface $events)
     {
@@ -60,7 +60,9 @@ public function attachShared(SharedEventManagerInterface $events)
     }
 
     /**
-     * {@inheritdoc}
+     * Detach events from a shared event manager
+     *
+     * @return void
      */
     public function detachShared(SharedEventManagerInterface $events)
     {
@@ -70,8 +72,7 @@ public function detachShared(SharedEventManagerInterface $events)
     /**
      * Callback to process events
      *
-     * @param EventInterface $event
-     * @return bool
+     * @return void
      * @throws ServiceNotFoundException
      */
     public function onCollectEvent(EventInterface $event)
diff --git a/src/Listener/FirePhpListener.php b/src/Listener/FirePhpListener.php
index 0486d72..87d1e92 100644
--- a/src/Listener/FirePhpListener.php
+++ b/src/Listener/FirePhpListener.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Listener;
 
 use Laminas\DeveloperTools\Profiler;
@@ -16,23 +18,16 @@ class FirePhpListener implements ListenerAggregateInterface
 {
     use ListenerAggregateTrait;
 
-    /**
-     * @var ServiceLocatorInterface
-     */
+    /** @var ServiceLocatorInterface */
     protected $serviceLocator;
 
-    /**
-     * Constructor.
-     *
-     * @param ServiceLocatorInterface $serviceLocator
-     */
     public function __construct(ServiceLocatorInterface $serviceLocator)
     {
         $this->serviceLocator = $serviceLocator;
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function attach(EventManagerInterface $events, $priority = 1)
     {
@@ -45,8 +40,6 @@ public function attach(EventManagerInterface $events, $priority = 1)
 
     /**
      * ProfilerEvent::EVENT_COLLECTED event callback.
-     *
-     * @param ProfilerEvent $event
      */
     public function onCollected(ProfilerEvent $event)
     {
diff --git a/src/Listener/FlushListener.php b/src/Listener/FlushListener.php
index 748452a..fe9a0e6 100644
--- a/src/Listener/FlushListener.php
+++ b/src/Listener/FlushListener.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Listener;
 
 use Laminas\DeveloperTools\Profiler;
@@ -9,6 +11,8 @@
 use Laminas\Mvc\MvcEvent;
 use Laminas\Stdlib\ResponseInterface;
 
+use function is_callable;
+
 /**
  * Flush Listener
  *
@@ -19,7 +23,7 @@ class FlushListener implements ListenerAggregateInterface
     use ListenerAggregateTrait;
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function attach(EventManagerInterface $events, $priority = 1)
     {
@@ -32,8 +36,6 @@ public function attach(EventManagerInterface $events, $priority = 1)
 
     /**
      * MvcEvent::EVENT_FINISH event callback
-     *
-     * @param MvcEvent $event
      */
     public function onFinish(MvcEvent $event)
     {
diff --git a/src/Listener/ProfilerListener.php b/src/Listener/ProfilerListener.php
index 9d9c3e0..bb6113d 100644
--- a/src/Listener/ProfilerListener.php
+++ b/src/Listener/ProfilerListener.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Listener;
 
 use Laminas\DeveloperTools\Options;
@@ -12,6 +14,8 @@
 use Laminas\ServiceManager\Exception\ServiceNotFoundException;
 use Laminas\ServiceManager\ServiceLocatorInterface;
 
+use function sprintf;
+
 /**
  * Profiler Listener
  *
@@ -21,22 +25,12 @@ class ProfilerListener implements ListenerAggregateInterface
 {
     use ListenerAggregateTrait;
 
-    /**
-     * @var ServiceLocatorInterface
-     */
+    /** @var ServiceLocatorInterface */
     protected $serviceLocator;
 
-    /**
-     * @var Options
-     */
+    /** @var Options */
     protected $options;
 
-    /**
-     * Constructor.
-     *
-     * @param ServiceLocatorInterface $serviceLocator
-     * @param Options                 $options
-     */
     public function __construct(ServiceLocatorInterface $serviceLocator, Options $options)
     {
         $this->options        = $options;
@@ -44,7 +38,7 @@ public function __construct(ServiceLocatorInterface $serviceLocator, Options $op
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function attach(EventManagerInterface $events, $priority = 1)
     {
@@ -58,7 +52,6 @@ public function attach(EventManagerInterface $events, $priority = 1)
     /**
      * MvcEvent::EVENT_FINISH event callback
      *
-     * @param  MvcEvent $event
      * @throws ServiceNotFoundException
      */
     public function onFinish(MvcEvent $event)
diff --git a/src/Listener/StorageListener.php b/src/Listener/StorageListener.php
index f92fdd9..596032d 100644
--- a/src/Listener/StorageListener.php
+++ b/src/Listener/StorageListener.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Listener;
 
 use Laminas\DeveloperTools\Profiler;
@@ -16,23 +18,16 @@ class StorageListener implements ListenerAggregateInterface
 {
     use ListenerAggregateTrait;
 
-    /**
-     * @var ServiceLocatorInterface
-     */
+    /** @var ServiceLocatorInterface */
     protected $serviceLocator;
 
-    /**
-     * Constructor.
-     *
-     * @param ServiceLocatorInterface $serviceLocator
-     */
     public function __construct(ServiceLocatorInterface $serviceLocator)
     {
         $this->serviceLocator = $serviceLocator;
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function attach(EventManagerInterface $events, $priority = 1)
     {
@@ -45,8 +40,6 @@ public function attach(EventManagerInterface $events, $priority = 1)
 
     /**
      * ProfilerEvent::EVENT_COLLECTED event callback.
-     *
-     * @param ProfilerEvent $event
      */
     public function onCollected(ProfilerEvent $event)
     {
diff --git a/src/Listener/ToolbarListener.php b/src/Listener/ToolbarListener.php
index 1f16e18..4ec8523 100644
--- a/src/Listener/ToolbarListener.php
+++ b/src/Listener/ToolbarListener.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Listener;
 
 use Laminas\DeveloperTools\Collector\AutoHideInterface;
@@ -13,6 +15,23 @@
 use Laminas\View\Exception\RuntimeException;
 use Laminas\View\Model\ViewModel;
 
+use function array_keys;
+use function explode;
+use function extension_loaded;
+use function file_exists;
+use function file_get_contents;
+use function file_put_contents;
+use function implode;
+use function is_dir;
+use function phpversion;
+use function preg_match;
+use function preg_replace;
+use function sprintf;
+use function str_replace;
+use function stripos;
+use function strpos;
+use function time;
+
 /**
  * Developer Toolbar Listener
  */
@@ -25,30 +44,23 @@ class ToolbarListener implements ListenerAggregateInterface
      *
      * @var integer
      */
-    const VERSION_CACHE_TTL = 3600;
+    public const VERSION_CACHE_TTL = 3600;
 
     /**
      * Documentation URI pattern.
      *
      * @var string
      */
-    const DOC_URI = 'https://docs.laminas.dev/';
+    public const DOC_URI = 'https://docs.laminas.dev/';
 
-    /**
-     * @var object
-     */
+    /** @var object */
     protected $renderer;
 
-    /**
-     * @var Options
-     */
+    /** @var Options */
     protected $options;
 
     /**
-     * Constructor.
-     *
      * @param object  $viewRenderer
-     * @param Options $options
      */
     public function __construct($viewRenderer, Options $options)
     {
@@ -57,7 +69,7 @@ public function __construct($viewRenderer, Options $options)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function attach(EventManagerInterface $events, $priority = 1)
     {
@@ -71,8 +83,6 @@ public function attach(EventManagerInterface $events, $priority = 1)
 
     /**
      * ProfilerEvent::EVENT_COLLECTED event callback.
-     *
-     * @param ProfilerEvent $event
      */
     public function onCollected(ProfilerEvent $event)
     {
@@ -84,8 +94,9 @@ public function onCollected(ProfilerEvent $event)
         }
 
         $response = $application->getResponse();
-        $headers = $response->getHeaders();
-        if ($headers->has('Content-Type')
+        $headers  = $response->getHeaders();
+        if (
+            $headers->has('Content-Type')
             && false === strpos($headers->get('Content-Type')->getFieldValue(), 'html')
         ) {
             return;
@@ -100,32 +111,30 @@ public function onCollected(ProfilerEvent $event)
     /**
      * Tries to injects the toolbar into the view. The toolbar is only injected in well
      * formed HTML by replacing the closing body tag, leaving ESI untouched.
-     *
-     * @param ProfilerEvent $event
      */
     protected function injectToolbar(ProfilerEvent $event)
     {
-        $entries     = $this->renderEntries($event);
-        $response    = $event->getApplication()->getResponse();
+        $entries  = $this->renderEntries($event);
+        $response = $event->getApplication()->getResponse();
 
         $toolbarView = new ViewModel(['entries' => $entries]);
         $toolbarView->setTemplate('laminas-developer-tools/toolbar/toolbar');
-        $toolbar     = $this->renderer->render($toolbarView);
+        $toolbar = $this->renderer->render($toolbarView);
 
-        $toolbarCss  = new ViewModel([
+        $toolbarCss = new ViewModel([
             'position' => $this->options->getToolbarPosition(),
         ]);
         $toolbarCss->setTemplate('laminas-developer-tools/toolbar/style');
-        $style       = $this->renderer->render($toolbarCss);
+        $style = $this->renderer->render($toolbarCss);
 
-        $toolbarJs   = new ViewModel();
+        $toolbarJs = new ViewModel();
         $toolbarJs->setTemplate('laminas-developer-tools/toolbar/script');
-        $script      = $this->renderer->render($toolbarJs);
+        $script = $this->renderer->render($toolbarJs);
 
-        $toolbar  = str_replace(['$', '\\\\'], ['\$', '\\\\\\'], $toolbar);
+        $toolbar = str_replace(['$', '\\\\'], ['\$', '\\\\\\'], $toolbar);
 
         $content = $response->getBody();
-        $isHTML5 = stripos($content, '<!doctype html>') === 0;
+        $isHtml5 = stripos($content, '<!doctype html>') === 0;
 
         if (preg_match('/<\/body>(?![\s\S]*<\/body>)/i', $content)) {
             $injected = preg_replace(
@@ -135,16 +144,16 @@ protected function injectToolbar(ProfilerEvent $event)
                 1
             );
 
-            $prepend = $isHTML5
+            $prepend = $isHtml5
                 ? (preg_match('/<\/head>/i', $injected) ? 'head' : 'body')
                 : 'body';
 
             $injected = preg_replace('/<\/' . $prepend . '>/i', $style . "\n</$prepend>", $injected, 1);
         } else {
-            $injected = $isHTML5
+            $injected = $isHtml5
                 ? (stripos($content, '</html>') !== false
                     ? preg_replace('/<\/html>/i', $style . $toolbar . $script . "\n</html>", $content, 1)
-                    : '<!doctype html>' . $content . $style. $toolbar . $script)
+                    : '<!doctype html>' . $content . $style . $toolbar . $script)
                 : $content;
         }
 
@@ -154,14 +163,13 @@ protected function injectToolbar(ProfilerEvent $event)
     /**
      * Renders all toolbar entries.
      *
-     * @param  ProfilerEvent $event
      * @return array
      * @throws InvalidOptionException
      */
     protected function renderEntries(ProfilerEvent $event)
     {
-        $entries = [];
-        $report  = $event->getReport();
+        $entries      = [];
+        $report       = $event->getReport();
         $laminasEntry = new ViewModel([
             'php_version' => phpversion(),
             'has_intl'    => extension_loaded('intl'),
@@ -180,7 +188,8 @@ protected function renderEntries(ProfilerEvent $event)
                 try {
                     $collectorInstance = $report->getCollector($name);
 
-                    if ($this->options->getToolbarAutoHide()
+                    if (
+                        $this->options->getToolbarAutoHide()
                         && $collectorInstance instanceof AutoHideInterface
                         && $collectorInstance->canHide()
                     ) {
@@ -213,7 +222,7 @@ protected function renderEntries(ProfilerEvent $event)
         }
 
         if ($report->hasErrors()) {
-            $errorTpl  = new ViewModel(['errors' => $report->getErrors()]);
+            $errorTpl = new ViewModel(['errors' => $report->getErrors()]);
             $errorTpl->setTemplate('laminas-developer-tools/toolbar/error');
             $entries[] = $this->renderer->render($errorTpl);
         }
@@ -253,8 +262,8 @@ protected function getLatestVersion($currentVersion)
                 }
 
                 return [
-                    ($cache[1] === 'yes') ? true : false,
-                    $cache[2]
+                    $cache[1] === 'yes' ? true : false,
+                    $cache[2],
                 ];
             }
         }
@@ -267,8 +276,8 @@ protected function getLatestVersion($currentVersion)
             sprintf(
                 '%d|%s|%s',
                 time(),
-                ($isLatest) ? 'yes' : 'no',
-                ($latest === null) ? 'N/A' : $latest
+                $isLatest ? 'yes' : 'no',
+                $latest ?? 'N/A'
             )
         );
 
diff --git a/src/MatchInterface.php b/src/MatchInterface.php
index bba6f86..d993a3d 100644
--- a/src/MatchInterface.php
+++ b/src/MatchInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools;
 
 interface MatchInterface
diff --git a/src/Module.php b/src/Module.php
index 38c35fc..9692f63 100644
--- a/src/Module.php
+++ b/src/Module.php
@@ -1,8 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools;
 
 use BjyProfiler\Db\Adapter\ProfilingAdapter;
+use Laminas\DeveloperTools\ReportInterface;
 use Laminas\EventManager\EventInterface;
 use Laminas\ModuleManager\Feature\BootstrapListenerInterface;
 use Laminas\ModuleManager\Feature\ConfigProviderInterface;
@@ -11,6 +14,17 @@
 use Laminas\ModuleManager\Feature\ViewHelperProviderInterface;
 use Laminas\ModuleManager\ModuleEvent;
 use Laminas\ModuleManager\ModuleManagerInterface;
+use ZendDeveloperTools\Listener\EventLoggingListenerAggregate;
+use ZendDeveloperTools\Listener\ProfilerListener;
+use ZendDeveloperTools\Listener\ToolbarListener;
+
+use function array_map;
+use function define;
+use function defined;
+use function implode;
+use function microtime;
+
+use const PHP_SAPI;
 
 class Module implements
     InitProviderInterface,
@@ -21,8 +35,6 @@ class Module implements
 {
     /**
      * Initialize workflow
-     *
-     * @param  ModuleManagerInterface $manager
      */
     public function init(ModuleManagerInterface $manager)
     {
@@ -50,7 +62,8 @@ public function onLoadModulesPost($event)
         $eventManager  = $event->getTarget()->getEventManager();
         $configuration = $event->getConfigListener()->getMergedConfig(false);
 
-        if (isset($configuration['laminas-developer-tools']['profiler']['enabled'])
+        if (
+            isset($configuration['laminas-developer-tools']['profiler']['enabled'])
             && $configuration['laminas-developer-tools']['profiler']['enabled'] === true
         ) {
             $eventManager->trigger(ProfilerEvent::EVENT_PROFILER_INIT, $event);
@@ -60,7 +73,6 @@ public function onLoadModulesPost($event)
     /**
      * Laminas\Mvc\MvcEvent::EVENT_BOOTSTRAP event callback
      *
-     * @param  EventInterface $event
      * @throws Exception\InvalidOptionException
      * @throws Exception\ProfilerException
      */
@@ -79,7 +91,7 @@ public function onBootstrap(EventInterface $event)
             return;
         }
 
-        $em  = $app->getEventManager();
+        $em     = $app->getEventManager();
         $report = $sm->get(Report::class);
 
         if ($options->canFlushEarly()) {
@@ -92,7 +104,7 @@ public function onBootstrap(EventInterface $event)
         }
 
         if ($options->eventCollectionEnabled()) {
-            $sem = $em->getSharedManager();
+            $sem                  = $em->getSharedManager();
             $eventLoggingListener = $sm->get(Listener\EventLoggingListenerAggregate::class);
             $eventLoggingListener->attachShared($sem);
         }
@@ -111,20 +123,23 @@ public function onBootstrap(EventInterface $event)
     }
 
     /**
-     * @inheritdoc
+     * @inheritDoc
      */
     public function getConfig()
     {
         return include __DIR__ . '/../config/module.config.php';
     }
 
+    /**
+     * @inheritDoc
+     */
     public function getViewHelperConfig()
     {
         return [
             // Legacy Zend Framework aliases
-            'aliases' => [
-                'ZendDeveloperToolsTime' => 'LaminasDeveloperToolsTime',
-                'ZendDeveloperToolsMemory' => 'LaminasDeveloperToolsMemory',
+            'aliases'    => [
+                'ZendDeveloperToolsTime'        => 'LaminasDeveloperToolsTime',
+                'ZendDeveloperToolsMemory'      => 'LaminasDeveloperToolsMemory',
                 'ZendDeveloperToolsDetailArray' => 'LaminasDeveloperToolsDetailArray',
             ],
             'invokables' => [
@@ -136,31 +151,31 @@ public function getViewHelperConfig()
     }
 
     /**
-     * @inheritdoc
+     * @inheritDoc
      */
     public function getServiceConfig()
     {
         return [
-            'aliases' => [
-                'Laminas\DeveloperTools\ReportInterface' => Report::class,
+            'aliases'    => [
+                ReportInterface::class => Report::class,
 
                 // Legacy Zend Framework aliases
-                'ZendDeveloperTools\ReportInterface' => 'Laminas\DeveloperTools\ReportInterface',
-                \ZendDeveloperTools\Report::class => Report::class,
+                'ZendDeveloperTools\ReportInterface'    => ReportInterface::class,
+                \ZendDeveloperTools\Report::class       => Report::class,
                 'ZendDeveloperTools\ExceptionCollector' => 'Laminas\DeveloperTools\ExceptionCollector',
-                'ZendDeveloperTools\RequestCollector' => 'Laminas\DeveloperTools\RequestCollector',
-                'ZendDeveloperTools\ConfigCollector' => 'Laminas\DeveloperTools\ConfigCollector',
-                'ZendDeveloperTools\MailCollector' => 'Laminas\DeveloperTools\MailCollector',
-                'ZendDeveloperTools\MemoryCollector' => 'Laminas\DeveloperTools\MemoryCollector',
-                'ZendDeveloperTools\TimeCollector' => 'Laminas\DeveloperTools\TimeCollector',
-                'ZendDeveloperTools\FlushListener' => 'Laminas\DeveloperTools\FlushListener',
-                \ZendDeveloperTools\Profiler::class => Profiler::class,
-                'ZendDeveloperTools\Config' => 'Laminas\DeveloperTools\Config',
-                'ZendDeveloperTools\Event' => 'Laminas\DeveloperTools\Event',
-                'ZendDeveloperTools\StorageListener' => 'Laminas\DeveloperTools\StorageListener',
-                \ZendDeveloperTools\Listener\ToolbarListener::class => Listener\ToolbarListener::class,
-                \ZendDeveloperTools\Listener\ProfilerListener::class => Listener\ProfilerListener::class,
-                \ZendDeveloperTools\Listener\EventLoggingListenerAggregate::class
+                'ZendDeveloperTools\RequestCollector'   => 'Laminas\DeveloperTools\RequestCollector',
+                'ZendDeveloperTools\ConfigCollector'    => 'Laminas\DeveloperTools\ConfigCollector',
+                'ZendDeveloperTools\MailCollector'      => 'Laminas\DeveloperTools\MailCollector',
+                'ZendDeveloperTools\MemoryCollector'    => 'Laminas\DeveloperTools\MemoryCollector',
+                'ZendDeveloperTools\TimeCollector'      => 'Laminas\DeveloperTools\TimeCollector',
+                'ZendDeveloperTools\FlushListener'      => 'Laminas\DeveloperTools\FlushListener',
+                \ZendDeveloperTools\Profiler::class     => Profiler::class,
+                'ZendDeveloperTools\Config'             => 'Laminas\DeveloperTools\Config',
+                'ZendDeveloperTools\Event'              => 'Laminas\DeveloperTools\Event',
+                'ZendDeveloperTools\StorageListener'    => 'Laminas\DeveloperTools\StorageListener',
+                ToolbarListener::class                  => Listener\ToolbarListener::class,
+                ProfilerListener::class                 => Listener\ProfilerListener::class,
+                EventLoggingListenerAggregate::class
                     => Listener\EventLoggingListenerAggregate::class,
                 'ZendDeveloperTools\DbCollector' => 'Laminas\DeveloperTools\DbCollector',
             ],
@@ -174,35 +189,35 @@ public function getServiceConfig()
                 'Laminas\DeveloperTools\TimeCollector'      => Collector\TimeCollector::class,
                 'Laminas\DeveloperTools\FlushListener'      => Listener\FlushListener::class,
             ],
-            'factories' => [
-                Profiler::class => function ($sm) {
+            'factories'  => [
+                Profiler::class                               => function ($sm) {
                     $a = new Profiler($sm->get(Report::class));
                     $a->setEvent($sm->get('Laminas\DeveloperTools\Event'));
                     return $a;
                 },
-                'Laminas\DeveloperTools\Config' => function ($sm) {
+                'Laminas\DeveloperTools\Config'               => function ($sm) {
                     $config = $sm->get('Configuration');
-                    $config = isset($config['laminas-developer-tools']) ? $config['laminas-developer-tools'] : null;
+                    $config = $config['laminas-developer-tools'] ?? null;
 
                     return new Options($config, $sm->get(Report::class));
                 },
-                'Laminas\DeveloperTools\Event' => function ($sm) {
+                'Laminas\DeveloperTools\Event'                => function ($sm) {
                     $event = new ProfilerEvent();
                     $event->setReport($sm->get(Report::class));
                     $event->setApplication($sm->get('Application'));
 
                     return $event;
                 },
-                'Laminas\DeveloperTools\StorageListener' => function ($sm) {
+                'Laminas\DeveloperTools\StorageListener'      => function ($sm) {
                     return new Listener\StorageListener($sm);
                 },
-                Listener\ToolbarListener::class => function ($sm) {
+                Listener\ToolbarListener::class               => function ($sm) {
                     return new Listener\ToolbarListener(
                         $sm->get('ViewRenderer'),
                         $sm->get('Laminas\DeveloperTools\Config')
                     );
                 },
-                Listener\ProfilerListener::class => function ($sm) {
+                Listener\ProfilerListener::class              => function ($sm) {
                     return new Listener\ProfilerListener($sm, $sm->get('Laminas\DeveloperTools\Config'));
                 },
                 Listener\EventLoggingListenerAggregate::class => function ($sm) {
@@ -213,7 +228,7 @@ public function getServiceConfig()
                         $config->getEventIdentifiers()
                     );
                 },
-                'Laminas\DeveloperTools\DbCollector' => function ($sm) {
+                'Laminas\DeveloperTools\DbCollector'          => function ($sm) {
                     $p  = false;
                     $db = new Collector\DbCollector();
 
diff --git a/src/Options.php b/src/Options.php
index a04a3be..ea98059 100644
--- a/src/Options.php
+++ b/src/Options.php
@@ -1,29 +1,32 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools;
 
 use Laminas\Stdlib\AbstractOptions;
+use Laminas\Stdlib\Exception\InvalidArgumentException;
+
+use function gettype;
+use function is_array;
+use function sprintf;
 
 /**
  * @todo storage and firephp options
  */
 class Options extends AbstractOptions
 {
-    /**
-     * @var ReportInterface
-     */
+    /** @var ReportInterface */
     protected $report;
 
-    /**
-     * @var array
-     */
+    /** @var array */
     protected $profiler = [
         'enabled'     => false,
         'strict'      => true,
         'flush_early' => false,
         'cache_dir'   => 'data/cache',
         'matcher'     => [],
-        'collectors' => [
+        'collectors'  => [
             'db'        => DbCollector::class,
             'exception' => ExceptionCollector::class,
             'request'   => RequestCollector::class,
@@ -35,22 +38,21 @@ class Options extends AbstractOptions
 
     /**
      * Defaults for event-level logging
+     *
      * @var array
      */
     protected $events = [
-        'enabled'    => false,
-        'collectors' => [
+        'enabled'     => false,
+        'collectors'  => [
             'memory' => MemoryCollector::class,
             'time'   => TimeCollector::class,
         ],
         'identifiers' => [
-            'all' => '*'
-        ]
+            'all' => '*',
+        ],
     ];
 
-    /**
-     * @var array
-     */
+    /** @var array */
     protected $toolbar = [
         'enabled'       => false,
         'auto_hide'     => false,
@@ -66,11 +68,8 @@ class Options extends AbstractOptions
     ];
 
     /**
-     * Overloading Constructor.
-     *
      * @param  array|Traversable|null $options
-     * @param  ReportInterface        $report
-     * @throws \Laminas\Stdlib\Exception\InvalidArgumentException
+     * @throws InvalidArgumentException
      */
     public function __construct($options, ReportInterface $report)
     {
@@ -131,7 +130,6 @@ public function setEvents(array $options)
         }
     }
 
-
     /**
      * Sets Profiler matcher options.
      *
@@ -166,7 +164,7 @@ protected function setCollectors($options)
         }
 
         foreach ($options as $name => $collector) {
-            if (($collector === false || $collector === null)) {
+            if ($collector === false || $collector === null) {
                 unset($this->profiler['collectors'][$name]);
                 continue;
             }
@@ -201,7 +199,7 @@ public function setEventCollectors(array $options)
         }
 
         foreach ($options as $name => $collector) {
-            if (($collector === false || $collector === null)) {
+            if ($collector === false || $collector === null) {
                 unset($this->events['collectors'][$name]);
                 continue;
             }
@@ -227,7 +225,7 @@ public function setEventIdentifiers(array $options)
         }
 
         foreach ($options as $name => $identifier) {
-            if (($identifier === false || $identifier === null)) {
+            if ($identifier === false || $identifier === null) {
                 unset($this->events['identifiers'][$name]);
                 continue;
             }
@@ -266,9 +264,9 @@ public function isStrict()
      */
     public function canFlushEarly()
     {
-        return ($this->profiler['flush_early']
+        return $this->profiler['flush_early']
             && ! $this->profiler['strict']
-            && ! $this->toolbar['enabled']);
+            && ! $this->toolbar['enabled'];
     }
 
     /**
@@ -314,7 +312,6 @@ public function getEventIdentifiers()
         return $this->events['identifiers'];
     }
 
-
     /**
      * Sets Toolbar options.
      *
diff --git a/src/Profiler.php b/src/Profiler.php
index ac8758a..d616c28 100644
--- a/src/Profiler.php
+++ b/src/Profiler.php
@@ -1,15 +1,23 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools;
 
 use DateTime;
-use DateTimezone;
+use DateTimeZone;
 use Laminas\EventManager\EventInterface;
 use Laminas\EventManager\EventManagerAwareInterface;
 use Laminas\EventManager\EventManagerInterface;
 use Laminas\Mvc\MvcEvent;
 use Laminas\Stdlib\PriorityQueue;
 
+use function get_class;
+use function sprintf;
+use function uniqid;
+
+use const PHP_INT_MAX;
+
 class Profiler implements EventManagerAwareInterface
 {
     /**
@@ -17,14 +25,14 @@ class Profiler implements EventManagerAwareInterface
      *
      * @var int
      */
-    const PRIORITY_EVENT_COLLECTOR = PHP_INT_MAX;
+    public const PRIORITY_EVENT_COLLECTOR = PHP_INT_MAX;
 
     /**
      * FirePHP listener priority.
      *
      * @var int
      */
-    const PRIORITY_FIREPHP = 500;
+    public const PRIORITY_FIREPHP = 500;
 
     /**
      * Flush listener priority.
@@ -32,59 +40,44 @@ class Profiler implements EventManagerAwareInterface
      *
      * @var int
      */
-    const PRIORITY_FLUSH = -9400;
+    public const PRIORITY_FLUSH = -9400;
 
     /**
      * Profiler listener priority.
      *
      * @var int
      */
-    const PRIORITY_PROFILER = -9500;
+    public const PRIORITY_PROFILER = -9500;
 
     /**
      * Storage listener priority.
      *
      * @var int
      */
-    const PRIORITY_STORAGE = 100;
+    public const PRIORITY_STORAGE = 100;
 
     /**
      * Toolbar listener priority.
      *
      * @var int
      */
-    const PRIORITY_TOOLBAR = 500;
+    public const PRIORITY_TOOLBAR = 500;
 
-    /**
-     * @var bool
-     */
+    /** @var bool */
     protected $strict;
 
-    /**
-     * @var ProfilerEvent
-     */
+    /** @var ProfilerEvent */
     protected $event;
 
-    /**
-     * @var ReportInterface
-     */
+    /** @var ReportInterface */
     protected $report;
 
-    /**
-     * @var PriorityQueue
-     */
+    /** @var PriorityQueue */
     protected $collectors;
 
-    /**
-     * @var EventManagerInterface
-     */
+    /** @var EventManagerInterface */
     protected $eventManager;
 
-    /**
-     * Constructor.
-     *
-     * @param ReportInterface $report
-     */
     public function __construct(ReportInterface $report)
     {
         $this->report = $report;
@@ -105,7 +98,6 @@ public function setErrorMode($mode)
     /**
      * Set the profiler event object.
      *
-     * @param  EventInterface $event
      * @return self
      */
     public function setEvent(EventInterface $event)
@@ -133,12 +125,11 @@ public function getEvent()
     /**
      * Set the event manager instance
      *
-     * @param  EventManagerInterface $eventManager
      * @return self
      */
     public function setEventManager(EventManagerInterface $eventManager)
     {
-        $eventManager->addIdentifiers([__CLASS__, get_called_class(), 'profiler']);
+        $eventManager->addIdentifiers([self::class, static::class, 'profiler']);
         $this->eventManager = $eventManager;
 
         return $this;
@@ -185,7 +176,6 @@ public function addCollector($collector)
      * Runs all collectors.
      *
      * @triggers ProfilerEvent::EVENT_COLLECTED
-     * @param    MvcEvent $mvcEvent
      * @return   Profiler
      * @throws   Exception\ProfilerException
      */
diff --git a/src/ProfilerEvent.php b/src/ProfilerEvent.php
index a79211c..ce91685 100644
--- a/src/ProfilerEvent.php
+++ b/src/ProfilerEvent.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools;
 
 use Laminas\EventManager\Event;
@@ -14,7 +16,7 @@ class ProfilerEvent extends Event
      *
      * @var string
      */
-    const EVENT_PROFILER_INIT = 'profiler_init';
+    public const EVENT_PROFILER_INIT = 'profiler_init';
 
     /**
      * The EVENT_COLLECTED occurs after all data was collected.
@@ -23,7 +25,7 @@ class ProfilerEvent extends Event
      *
      * @var string
      */
-    const EVENT_COLLECTED = 'collected';
+    public const EVENT_COLLECTED = 'collected';
 
     /**
      * Set Application
@@ -38,7 +40,6 @@ public function getApplication()
     /**
      * Set Application
      *
-     * @param  ApplicationInterface $application
      * @return self
      */
     public function setApplication(ApplicationInterface $application)
@@ -60,7 +61,6 @@ public function getProfiler()
     /**
      * Set profiler
      *
-     * @param  Profiler $profiler
      * @return self
      */
     public function setProfiler(Profiler $profiler)
@@ -82,7 +82,6 @@ public function getReport()
     /**
      * Set report
      *
-     * @param  ReportInterface $report
      * @return self
      */
     public function setReport(ReportInterface $report)
diff --git a/src/Report.php b/src/Report.php
index c3b675b..6990d07 100644
--- a/src/Report.php
+++ b/src/Report.php
@@ -1,46 +1,38 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools;
 
+use DateTime;
+
+use function array_keys;
+
 class Report implements ReportInterface
 {
-    /**
-     * @var string
-     */
+    /** @var string */
     protected $ip;
 
-    /**
-     * @var string
-     */
+    /** @var string */
     protected $uri;
 
-    /**
-     * @var \DateTime
-     */
+    /** @var DateTime */
     protected $time;
 
-    /**
-     * @var string
-     */
+    /** @var string */
     protected $token;
 
-    /**
-     * @var array
-     */
+    /** @var array */
     protected $errors;
 
-    /**
-     * @var string
-     */
+    /** @var string */
     protected $method;
 
-    /**
-     * @var array
-     */
+    /** @var array */
     protected $collectors = [];
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function setIp($ip)
     {
@@ -49,7 +41,7 @@ public function setIp($ip)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getIp()
     {
@@ -57,7 +49,7 @@ public function getIp()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function setUri($uri)
     {
@@ -66,7 +58,7 @@ public function setUri($uri)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getUri()
     {
@@ -74,7 +66,7 @@ public function getUri()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function setTime($time)
     {
@@ -83,7 +75,7 @@ public function setTime($time)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getTime()
     {
@@ -91,7 +83,7 @@ public function getTime()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function setToken($token)
     {
@@ -100,7 +92,7 @@ public function setToken($token)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getToken()
     {
@@ -108,7 +100,7 @@ public function getToken()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function addError($error)
     {
@@ -121,7 +113,7 @@ public function addError($error)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getErrors()
     {
@@ -129,7 +121,7 @@ public function getErrors()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function hasErrors()
     {
@@ -137,7 +129,7 @@ public function hasErrors()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function setMethod($method)
     {
@@ -146,7 +138,7 @@ public function setMethod($method)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getMethod()
     {
@@ -154,7 +146,7 @@ public function getMethod()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function hasCollector($name)
     {
@@ -162,7 +154,7 @@ public function hasCollector($name)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getCollector($name)
     {
@@ -174,7 +166,7 @@ public function getCollector($name)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getCollectors()
     {
@@ -182,7 +174,7 @@ public function getCollectors()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function getCollectorNames()
     {
@@ -190,7 +182,7 @@ public function getCollectorNames()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function setCollectors(array $collectors)
     {
@@ -202,7 +194,7 @@ public function setCollectors(array $collectors)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritDoc
      */
     public function addCollector(Collector\CollectorInterface $collector)
     {
diff --git a/src/ReportInterface.php b/src/ReportInterface.php
index 5576fc8..caccfc3 100644
--- a/src/ReportInterface.php
+++ b/src/ReportInterface.php
@@ -1,7 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools;
 
+use DateTime;
+
 interface ReportInterface
 {
     /**
@@ -27,13 +31,13 @@ public function setUri($uri);
     public function getUri();
 
     /**
-     * @param  \DateTime $time
+     * @param DateTime $time
      * @return self
      */
     public function setTime($time);
 
     /**
-     * @return \DateTime
+     * @return DateTime
      */
     public function getTime();
 
@@ -104,7 +108,6 @@ public function getCollectorNames();
     public function setCollectors(array $collectors);
 
     /**
-     * @param  Collector\CollectorInterface $collector
      * @return self
      */
     public function addCollector(Collector\CollectorInterface $collector);
diff --git a/src/Storage/StorageInterface.php b/src/Storage/StorageInterface.php
index 0103941..47bdfcd 100644
--- a/src/Storage/StorageInterface.php
+++ b/src/Storage/StorageInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Storage;
 
 interface StorageInterface
diff --git a/src/Stub/ClosureStub.php b/src/Stub/ClosureStub.php
index 75681cc..8e5ae6a 100644
--- a/src/Stub/ClosureStub.php
+++ b/src/Stub/ClosureStub.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\Stub;
 
 /**
diff --git a/src/View/Helper/DetailArray.php b/src/View/Helper/DetailArray.php
index 2c4cae6..56992a4 100644
--- a/src/View/Helper/DetailArray.php
+++ b/src/View/Helper/DetailArray.php
@@ -1,9 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\View\Helper;
 
 use Laminas\View\Helper\AbstractHelper;
 
+use function implode;
+use function sprintf;
+
 class DetailArray extends AbstractHelper
 {
     /**
@@ -16,24 +21,23 @@ class DetailArray extends AbstractHelper
      */
     public function __invoke($label, array $details, $redundant = false)
     {
-        $r   = [];
+        $r = [];
 
         $r[] = '<span class="laminas-toolbar-info';
-        $r[] = ($redundant) ? ' laminas-toolbar-info-redundant' : '';
+        $r[] = $redundant ? ' laminas-toolbar-info-redundant' : '';
         $r[] = '">';
 
         $r[] = '<span class="laminas-detail-label">';
         $r[] = $label;
         $r[] = '</span>';
 
-
         $extraCss = '';
         $newLine  = false;
 
         foreach ($details as $entry) {
             if ($newLine === true) {
                 $r[] = '</span><span class="laminas-toolbar-info';
-                $r[] = ($redundant) ? ' laminas-toolbar-info-redundant' : '';
+                $r[] = $redundant ? ' laminas-toolbar-info-redundant' : '';
                 $r[] = '">';
             }
 
diff --git a/src/View/Helper/Memory.php b/src/View/Helper/Memory.php
index c845912..086a416 100644
--- a/src/View/Helper/Memory.php
+++ b/src/View/Helper/Memory.php
@@ -1,9 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\View\Helper;
 
 use Laminas\View\Helper\AbstractHelper;
 
+use function sprintf;
+
 class Memory extends AbstractHelper
 {
     /**
diff --git a/src/View/Helper/Time.php b/src/View/Helper/Time.php
index 07d3eb7..b4c74a6 100644
--- a/src/View/Helper/Time.php
+++ b/src/View/Helper/Time.php
@@ -1,9 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Laminas\DeveloperTools\View\Helper;
 
 use Laminas\View\Helper\AbstractHelper;
 
+use function sprintf;
+
 class Time extends AbstractHelper
 {
     /**
diff --git a/test/Collector/ConfigCollectorTest.php b/test/Collector/ConfigCollectorTest.php
index cbb4fe1..fdf8a11 100644
--- a/test/Collector/ConfigCollectorTest.php
+++ b/test/Collector/ConfigCollectorTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace LaminasTest\DeveloperTools\Collector;
 
 use Laminas\DeveloperTools\Collector\ConfigCollector;
@@ -9,11 +11,11 @@
 
 class ConfigCollectorTest extends TestCase
 {
-    public function testCollect()
+    public function testCollect(): void
     {
         $collector = new ConfigCollector();
 
-        $application = $this->getMockBuilder(Mvc\Application::class)
+        $application    = $this->getMockBuilder(Mvc\Application::class)
             ->disableOriginalConstructor()
             ->getMock();
         $serviceManager = $this->getMockBuilder(ServiceManager\ServiceManager::class)
diff --git a/test/Collector/MemoryCollectorTest.php b/test/Collector/MemoryCollectorTest.php
index 01df9b0..fd88c76 100644
--- a/test/Collector/MemoryCollectorTest.php
+++ b/test/Collector/MemoryCollectorTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace LaminasTest\DeveloperTools\Collector;
 
 use Laminas\DeveloperTools\Collector\MemoryCollector;
@@ -8,7 +10,7 @@
 
 class MemoryCollectorTest extends TestCase
 {
-    public function testCollector()
+    public function testCollector(): void
     {
         $collector = new MemoryCollector();
 
diff --git a/test/Exception/SerializableExceptionTest.php b/test/Exception/SerializableExceptionTest.php
index e4262d3..f063ece 100644
--- a/test/Exception/SerializableExceptionTest.php
+++ b/test/Exception/SerializableExceptionTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace LaminasTest\DeveloperTools\Exception;
 
 use Exception;
@@ -10,9 +12,9 @@
 
 class SerializableExceptionTest extends TestCase
 {
-    public function testSerializableExceptionUsesPreviousExceptionMessage()
+    public function testSerializableExceptionUsesPreviousExceptionMessage(): void
     {
-        $original = new Exception('foo');
+        $original     = new Exception('foo');
         $serializable = new SerializableException($original);
         $this->assertEquals($original->getMessage(), $serializable->getMessage());
     }
@@ -20,10 +22,10 @@ public function testSerializableExceptionUsesPreviousExceptionMessage()
     /**
      * @requires PHP 7
      */
-    public function testSerializableExceptionReportsCallToUndefinedMethod()
+    public function testSerializableExceptionReportsCallToUndefinedMethod(): void
     {
         try {
-            (new stdClass)->iDoNotExist();
+            (new stdClass())->iDoNotExist();
         } catch (Throwable $exception) {
             $serializable = new SerializableException($exception);
             $this->assertEquals('Call to undefined method stdClass::iDoNotExist()', $serializable->getMessage());
diff --git a/test/Listener/ToolbarListenerTest.php b/test/Listener/ToolbarListenerTest.php
index 1aee55f..94e830d 100644
--- a/test/Listener/ToolbarListenerTest.php
+++ b/test/Listener/ToolbarListenerTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace LaminasTest\DeveloperTools\Listener;
 
 use Laminas\DeveloperTools\Listener\ToolbarListener;
@@ -16,22 +18,26 @@
 
 class ToolbarListenerTest extends TestCase
 {
-    public function provideHTMLBodyWithInjectedFlag()
+    /**
+     * @return array<non-empty-string, array{0: non-empty-string, 1: bool}>
+     */
+    public function provideHTMLBodyWithInjectedFlag(): array
     {
         return [
             'not HTML5 has head and body' => ['<html><head></head><body></body></html>', true],
-            'not HTML5 has body' => ['<html><body></body></html>', true],
-            'not HTML5 not has body' => ['<html></html>', false],
-            'HTML5 with head' => ['<!doctype html><head></head><body></body>', true],
-            'HTML5 without head' => ['<!doctype html><body></body>', true],
-            'HTML5 without body' => ['<!doctype html>test', true],
+            'not HTML5 has body'          => ['<html><body></body></html>', true],
+            'not HTML5 not has body'      => ['<html></html>', false],
+            'HTML5 with head'             => ['<!doctype html><head></head><body></body>', true],
+            'HTML5 without head'          => ['<!doctype html><body></body>', true],
+            'HTML5 without body'          => ['<!doctype html>test', true],
         ];
     }
 
     /**
      * @dataProvider provideHTMLBodyWithInjectedFlag
+     * @param non-empty-string $htmlBody
      */
-    public function testOnCollected($htmlBody, $injected)
+    public function testOnCollected(string $htmlBody, bool $injected): void
     {
         $viewRenderer = $this->createMock(PhpRenderer::class);
         $viewRenderer->expects($this->any())
@@ -39,8 +45,8 @@ public function testOnCollected($htmlBody, $injected)
                      ->willReturn('script');
 
         $profilerEvent = $this->createMock(ProfilerEvent::class);
-        $application = $this->createMock(Application::class);
-        $request = $this->createMock(Request::class);
+        $application   = $this->createMock(Application::class);
+        $request       = $this->createMock(Request::class);
         $application->expects($this->once())
                     ->method('getRequest')
                     ->willReturn($request);
diff --git a/test/ModuleTest.php b/test/ModuleTest.php
index 3299cff..a8a3397 100644
--- a/test/ModuleTest.php
+++ b/test/ModuleTest.php
@@ -1,13 +1,18 @@
 <?php
 
+declare(strict_types=1);
+
 namespace LaminasTest\DeveloperTools;
 
 use Laminas\DeveloperTools\Module;
 use PHPUnit\Framework\TestCase;
 
+use function serialize;
+use function unserialize;
+
 class ModuleTest extends TestCase
 {
-    public function testGetConfig()
+    public function testGetConfig(): void
     {
         $module = new Module();
         $config = $module->getConfig();
@@ -15,7 +20,7 @@ public function testGetConfig()
         $this->assertIsArray($config);
     }
 
-    public function testConfigSerialization()
+    public function testConfigSerialization(): void
     {
         $module = new Module();
         $config = $module->getConfig();
diff --git a/test/OptionsTest.php b/test/OptionsTest.php
index 28e44ab..df9bd7d 100644
--- a/test/OptionsTest.php
+++ b/test/OptionsTest.php
@@ -1,24 +1,30 @@
 <?php
 
+declare(strict_types=1);
+
 namespace LaminasTest\DeveloperTools;
 
+use Generator;
 use Laminas\DeveloperTools\Options;
 use Laminas\DeveloperTools\ReportInterface;
 use PHPUnit\Framework\TestCase;
 
 class OptionsTest extends TestCase
 {
-    public function testStatusOfDefaultConfiguration()
+    public function testStatusOfDefaultConfiguration(): void
     {
         $dist = require __DIR__ . '/../config/laminas-developer-tools.local.php.dist';
         /** @var ReportInterface $reportMock */
         $reportMock = $this->createMock(ReportInterface::class);
-        $options = new Options($dist['laminas-developer-tools'], $reportMock);
+        $options    = new Options($dist['laminas-developer-tools'], $reportMock);
         $this->assertTrue($options->isEnabled());
         $this->assertTrue($options->isToolbarEnabled());
     }
 
-    public function blacklistFlags()
+    /**
+     * @return Generator<non-empty-string, list<scalar>>
+     */
+    public function blacklistFlags(): Generator
     {
         yield 'null' => [null];
         yield 'false' => [false];
@@ -26,12 +32,12 @@ public function blacklistFlags()
 
     /**
      * @see https://framework.zend.com/security/advisory/ZF2019-01
+     *
      * @dataProvider blacklistFlags
-     * @param null|bool $flagValue
      */
-    public function testOnlyWhitelistedToolbarEntriesShouldBeEnabled(?bool $flagValue)
+    public function testOnlyWhitelistedToolbarEntriesShouldBeEnabled(?bool $flagValue): void
     {
-        $reportMock     = $this->createMock(ReportInterface::class);
+        $reportMock = $this->createMock(ReportInterface::class);
         /** @var ReportInterface $reportMock */
         $options        = new Options([], $reportMock);
         $toolbarOptions = [