155 lines
3.7 KiB
PHP
155 lines
3.7 KiB
PHP
<?php
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/**
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* UUID class
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*
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* The following class generates VALID RFC 4211 COMPLIANT
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* Universally Unique IDentifiers (UUID) version 3, 4 and 5.
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*
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* UUIDs generated validates using OSSP UUID Tool, and output
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* for named-based UUIDs are exactly the same. This is a pure
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* PHP implementation.
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*
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* @author Andrew Moore
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* @link http://www.php.net/manual/en/function.uniqid.php#94959
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*/
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class UUID
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{
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/**
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* Generate v3 UUID
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*
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* Version 3 UUIDs are named based. They require a namespace (another
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* valid UUID) and a value (the name). Given the same namespace and
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* name, the output is always the same.
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*
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* @param uuid $namespace
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* @param string $name
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*/
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public static function v3($namespace, $name)
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{
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if(!self::is_valid($namespace)) return false;
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// Get hexadecimal components of namespace
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$nhex = str_replace(array('-','{','}'), '', $namespace);
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// Binary Value
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$nstr = '';
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// Convert Namespace UUID to bits
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for($i = 0; $i < strlen($nhex); $i+=2)
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{
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$nstr .= chr(hexdec($nhex[$i].$nhex[$i+1]));
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}
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// Calculate hash value
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$hash = md5($nstr . $name);
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return sprintf('%08s-%04s-%04x-%04x-%12s',
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// 32 bits for "time_low"
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substr($hash, 0, 8),
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// 16 bits for "time_mid"
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substr($hash, 8, 4),
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// 16 bits for "time_hi_and_version",
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// four most significant bits holds version number 3
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(hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x3000,
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// 16 bits, 8 bits for "clk_seq_hi_res",
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// 8 bits for "clk_seq_low",
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// two most significant bits holds zero and one for variant DCE1.1
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(hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
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// 48 bits for "node"
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substr($hash, 20, 12)
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);
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}
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/**
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*
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* Generate v4 UUID
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*
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* Version 4 UUIDs are pseudo-random.
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*/
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public static function v4()
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{
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return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
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// 32 bits for "time_low"
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mt_rand(0, 0xffff), mt_rand(0, 0xffff),
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// 16 bits for "time_mid"
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mt_rand(0, 0xffff),
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// 16 bits for "time_hi_and_version",
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// four most significant bits holds version number 4
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mt_rand(0, 0x0fff) | 0x4000,
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// 16 bits, 8 bits for "clk_seq_hi_res",
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// 8 bits for "clk_seq_low",
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// two most significant bits holds zero and one for variant DCE1.1
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mt_rand(0, 0x3fff) | 0x8000,
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// 48 bits for "node"
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mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
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);
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}
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/**
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* Generate v5 UUID
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*
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* Version 5 UUIDs are named based. They require a namespace (another
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* valid UUID) and a value (the name). Given the same namespace and
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* name, the output is always the same.
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*
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* @param uuid $namespace
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* @param string $name
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*/
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public static function v5($namespace, $name)
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{
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if(!self::is_valid($namespace)) return false;
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// Get hexadecimal components of namespace
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$nhex = str_replace(array('-','{','}'), '', $namespace);
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// Binary Value
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$nstr = '';
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// Convert Namespace UUID to bits
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for($i = 0; $i < strlen($nhex); $i+=2)
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{
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$nstr .= chr(hexdec($nhex[$i].$nhex[$i+1]));
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}
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// Calculate hash value
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$hash = sha1($nstr . $name);
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return sprintf('%08s-%04s-%04x-%04x-%12s',
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// 32 bits for "time_low"
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substr($hash, 0, 8),
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// 16 bits for "time_mid"
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substr($hash, 8, 4),
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// 16 bits for "time_hi_and_version",
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// four most significant bits holds version number 5
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(hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x5000,
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// 16 bits, 8 bits for "clk_seq_hi_res",
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// 8 bits for "clk_seq_low",
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// two most significant bits holds zero and one for variant DCE1.1
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(hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
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// 48 bits for "node"
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substr($hash, 20, 12)
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);
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}
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public static function is_valid($uuid) {
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return preg_match('/^\{?[0-9a-f]{8}\-?[0-9a-f]{4}\-?[0-9a-f]{4}\-?'.
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'[0-9a-f]{4}\-?[0-9a-f]{12}\}?$/i', $uuid) === 1;
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}
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}
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?>
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