39 lines
768 B
PHP
39 lines
768 B
PHP
<?php
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namespace Khofmann\GUID;
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/**
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* Facade for GUID generators
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*/
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class GUID
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{
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/**
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* Private since facade.
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*/
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private function __construct()
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{
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}
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/**
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* Generate a UUID v4.
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*
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* @param mixed $data Optional data
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*
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* @return string UUID v4
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*/
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public static function v4($data = null): string
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{
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// Generate 16 bytes (128 bits) of random data or use the data passed into the function.
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$data = $data ?? random_bytes(16);
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assert(strlen($data) == 16);
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// Set version to 0100
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$data[6] = chr(ord($data[6]) & 0x0f | 0x40);
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// Set bits 6-7 to 10
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$data[8] = chr(ord($data[8]) & 0x3f | 0x80);
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// Output the 36 character UUID.
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return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
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}
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}
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