Initial implementation

.gitignore

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+.idea
+composer.lock
+vendor

README.md

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 # php-uuid-v6
-UUID v6 implementation
+
+UUID v6 implementation as proposed at https://bradleypeabody.github.io/uuidv6/
+
+## Example usage
+
+    for ($i = 0; $i < 10; $i++) {
+        echo \mikemix\Uuid::uuid6() , PHP_EOL;
+    }
+
+    > 1e859157-d7dc-6078-b7b8-02421fa799ff
+    > 1e859157-d7e3-64d6-9819-02421fa799ff
+    > 1e859157-d7e3-6602-8ecf-02421fa799ff
+    > 1e859157-d7e3-66fc-9898-02421fa799ff
+    > 1e859157-d7e3-67ec-ae4c-02421fa799ff
+    > 1e859157-d7e3-68d2-810a-02421fa799ff
+    > 1e859157-d7e3-69c2-b7cc-02421fa799ff
+    > 1e859157-d7e3-6aa8-871b-02421fa799ff
+    > 1e859157-d7e3-6b98-85c3-02421fa799ff
+    > 1e859157-d7e3-6c7e-a2c7-02421fa799ff

composer.json

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+{
+  "name": "mikemix/php-uuid-v6",
+  "description": "Version 6 UUID https://bradleypeabody.github.io/uuidv6/",
+  "type": "library",
+  "keywords": ["uuid", "identifier", "guid"],
+  "homepage": "https://github.com/mikemix/php-uuid-v6",
+  "license": "MIT",
+  "authors": [
+    {
+      "name": "Michal Zukowski",
+      "homepage": "https://dotcom.software"
+    }
+  ],
+  "require": {
+    "php": "^7.0",
+    "ramsey/uuid": "^3.7"
+  },
+  "autoload": {
+    "psr-4": {"mikemix\\": "src/"}
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^6.5"
+  }
+}

src/Uuid.php

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+<?php
+
+namespace mikemix;
+
+class Uuid extends \Ramsey\Uuid\Uuid
+{
+    /**
+     * @param int|string $node A 48-bit number representing the hardware address
+     *     This number may be represented as an integer or a hexadecimal string.
+     * @param int $clockSeq A 14-bit number used to help avoid duplicates that
+     *     could arise when the clock is set backwards in time or if the node ID
+     *     changes.
+     * @return string
+     */
+    public static function uuid6($node = null, $clockSeq = null)
+    {
+        return self::uuid1ToUuid6(parent::uuid1($node, $clockSeq)->toString());
+    }
+
+    /**
+     * Convert UUID v1 to UUID v6.
+     *
+     * @see https://bradleypeabody.github.io/uuidv6/
+     *
+     * @param string $uuidString
+     *
+     * @return string
+     */
+    public static function uuid1ToUuid6($uuidString)
+    {
+        $uuidString = str_replace('-', '', $uuidString);
+        $timeLow1 = substr($uuidString, 0, 5);
+        $timeLow2 = substr($uuidString, 5, 3);
+        $timeMid = substr($uuidString, 8, 4);
+        $timeHigh = substr($uuidString, 13, 3);
+        $rest = substr($uuidString, 16);
+
+        return
+            $timeHigh.$timeMid.$timeLow1[0].'-'.
+            substr($timeLow1, 1).'-'.
+            '6'.$timeLow2.'-'.
+            substr($rest, 0, 4).'-'.
+            substr($rest, 4);
+    }
+}

tests/run.php

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+<?php
+require __DIR__.'/../vendor/autoload.php';
+
+define('UUID_V1', 'ea6974c6-590f-11e8-b0f9-02421fa799ff');
+define('UUID_V6', '1e8590fe-a697-64c6-b0f9-02421fa799ff');
+
+if (($uuid6 = \mikemix\Uuid::uuid1ToUuid6(UUID_V1)) !== UUID_V6) {
+    throw new LogicException(sprintf('Test failed. "%s" given, but "%s" was expected', $uuid6, UUID_V6));
+}