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<?php
namespace GeniBase\Util;
/**
* UUID class
*
* The following class generates VALID RFC 4122 COMPLIANT
* Universally Unique IDentifiers (UUID) version 3, 4 and 5.
*
* UUIDs generated validates using OSSP UUID Tool, and output
* for named-based UUIDs are exactly the same. This is a pure
* PHP implementation.
*
* @author Andrew Moore
* @link http://www.php.net/manual/en/function.uniqid.php#94959
*/
class UUID
{
const NIL = '00000000-0000-0000-0000-000000000000';
const NAMESPACE_DNS = '6ba7b810-9dad-11d1-80b4-00c04fd430c8';
const NAMESPACE_URL = '6ba7b811-9dad-11d1-80b4-00c04fd430c8';
const NAMESPACE_OID = '6ba7b812-9dad-11d1-80b4-00c04fd430c8';
const NAMESPACE_X500 = '6ba7b814-9dad-11d1-80b4-00c04fd430c8';
/**
* Generate v3 UUID
*
* Version 3 UUIDs are named based. They require a namespace (another
* valid UUID) and a value (the name). Given the same namespace and
* name, the output is always the same.
*
* @param uuid $namespace
* @param string $name
*/
public static function v3($namespace, $name)
{
if (!self::isValid($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 . $name);
return sprintf(
'%08s-%04s-%04x-%04x-%12s',
// 32 bits for "time_low"
substr($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)
);
}
/**
* Generate v4 UUID
*
* Version 4 UUIDs are pseudo-random.
*/
public static function v4()
{
return sprintf(
'%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
// 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)
);
}
/**
* Generate v5 UUID
*
* Version 5 UUIDs are named based. They require a namespace (another
* valid UUID) and a value (the name). Given the same namespace and
* name, the output is always the same.
*
* @param uuid $namespace
* @param string $name
*/
public static function v5($namespace, $name)
{
if (!self::isValid($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 . $name);
return sprintf(
'%08s-%04s-%04x-%04x-%12s',
// 32 bits for "time_low"
substr($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 isValid($uuid)
{
return preg_match(
'/^\{?[0-9a-f]{8}\-?[0-9a-f]{4}\-?[0-9a-f]{4}\-?'.
'[0-9a-f]{4}\-?[0-9a-f]{12}\}?$/i',
$uuid
) === 1;
}
}