ruleset.xml

<?xml version="1.0"?>
<ruleset name="PHP Coding Standards">
    <description>Custom Ruleset</description>

    <!-- Extend the PSR-12 standard -->
    <rule ref="PSR12">
        <!-- Disable some rules that are too strict -->
        <exclude name="PSR12.Properties.ConstantVisibility.NotFound"/>
        <exclude name="PSR12.Traits.UseDeclaration.NamespaceNotValid"/>
    </rule>

    <!-- Require modern PHP versions -->
    <config name="testVersion" value="7.4-"/>

    <!-- Require LF line endings -->
    <rule ref="Generic.Files.LineEndings">
        <properties>
            <property name="eolChar" value="\n"/>
        </properties>
    </rule>

    <!-- Require UTF-8 encoding -->
    <rule ref="Generic.Files.ByteOrderMark"/>

    <!-- Require PHPDoc for all classes, functions and properties -->
    <rule ref="Squiz.Commenting.ClassComment"/>
    <rule ref="Squiz.Commenting.FunctionComment"/>
    <rule ref="Squiz.Commenting.VariableComment"/>

    <!-- Enforce camelCase for function and variable names -->
    <rule ref="Squiz.NamingConventions.ValidFunctionName"/>
    <rule ref="Squiz.NamingConventions.ValidVariableName"/>

    <!-- Disallow unnecessary code -->
    <rule ref="Generic.CodeAnalysis.UnusedFunctionParameter"/>
    <rule ref="Generic.CodeAnalysis.EmptyStatement"/>

    <!-- Additional rules -->
    <rule ref="Generic.Files.LineLength">
        <properties>
            <property name="lineLimit" value="120"/>
            <property name="absoluteLineLimit" value="150"/>
        </properties>
    </rule>
    <rule ref="Squiz.WhiteSpace.SuperfluousWhitespace"/>
    <rule ref="Squiz.WhiteSpace.LanguageConstructSpacing"/>
    <rule ref="Squiz.WhiteSpace.LogicalOperatorSpacing"/>
</ruleset>