UUID工具类

<?php

class UUID
{

public static function v3($namespace, $name)
{
if(!self::is_valid($namespace)) return false;

// Get hexadecimal components of namespace
$nhex = str_replace(array('-','{','}'), '', $namespace);

// Binary Value
$nstr = '';

// Convert Namespace UUID to bits
for($i = 0; $i < strlen($nhex); $i+=2)
{
$nstr .= chr(hexdec($nhex[$i].$nhex[$i+1]));
}

// Calculate hash value
$hash = md5($nstr . $name);

return sprintf('s-s-x-x-s',

// 32 bits for "time_low"
substr($hash, 0, 8),

// 16 bits for "time_mid"
substr($hash, 8, 4),

// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 3
(hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x3000,

// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one for variant DCE1.1
(hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,

// 48 bits for "node"
substr($hash, 20, 12)
);
}

public static function v4()
{
return sprintf('xx-x-x-x-xxx',

// 32 bits for "time_low"
mt_rand(0, 0xffff), mt_rand(0, 0xffff),

// 16 bits for "time_mid"
mt_rand(0, 0xffff),

// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 4
mt_rand(0, 0x0fff) | 0x4000,

// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one for variant DCE1.1
mt_rand(0, 0x3fff) | 0x8000,

// 48 bits for "node"
mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
);
}

public static function v5($namespace, $name)
{
if(!self::is_valid($namespace)) return false;

// Get hexadecimal components of namespace
$nhex = str_replace(array('-','{','}'), '', $namespace);

// Binary Value
$nstr = '';

// Convert Namespace UUID to bits
for($i = 0; $i < strlen($nhex); $i+=2)
{
$nstr .= chr(hexdec($nhex[$i].$nhex[$i+1]));
}

// Calculate hash value
$hash = sha1($nstr . $name);

return sprintf('s-s-x-x-s',

// 32 bits for "time_low"
substr($hash, 0, 8),

// 16 bits for "time_mid"
substr($hash, 8, 4),

// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 5
(hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x5000,

// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one for variant DCE1.1
(hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,

// 48 bits for "node"
substr($hash, 20, 12)
);
}

public static function is_valid($uuid) {
return preg_match('/^\{?[0-9a-f]{8}\-?[0-9a-f]{4}\-?[0-9a-f]{4}\-?'.
'[0-9a-f]{4}\-?[0-9a-f]{12}\}?$/i', $uuid) === 1;
}
}
?>