3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php class Uuid { const MD5 = 3; const SHA1 = 5; /** * 00001111 Clears all bits of version byte with AND * @var int */ const CLEAR_VER = 15; /** * 00111111 Clears all relevant bits of variant byte with AND * @var int */ const CLEAR_VAR = 63; /** * 11100000 Variant reserved for future use * @var int */ const VAR_RES = 224; /** * 11000000 Microsoft UUID variant * @var int */ const VAR_MS = 192; /** * 10000000 The RFC 4122 variant (this variant) * @var int */ const VAR_RFC = 128; /** * 00000000 The NCS compatibility variant * @var int */ const VAR_NCS = 0; /** * 00010000 * @var int */ const VERSION_1 = 16; /** * 00110000 * @var int */ const VERSION_3 = 48; /** * 01000000 * @var int */ const VERSION_4 = 64; /** * 01010000 * @var int */ const VERSION_5 = 80; /** * Time (in 100ns steps) between the start of the UTC and Unix epochs * @var int */ const INTERVAL = 0x01b21dd213814000; /** * @var string */ const NS_DNS = '6ba7b810-9dad-11d1-80b4-00c04fd430c8'; /** * @var string */ const NS_URL = '6ba7b811-9dad-11d1-80b4-00c04fd430c8'; /** * @var string */ const NS_OID = '6ba7b812-9dad-11d1-80b4-00c04fd430c8'; /** * @var string */ const NS_X500 = '6ba7b814-9dad-11d1-80b4-00c04fd430c8'; /** * @var string */ protected static $randomFunc = 'randomMcrypt'; protected $bytes; protected $hex; protected $string; protected $urn; protected $version; protected $variant; protected $node; protected $time; /** * @param string $uuid * @throws Exception */ protected function __construct($uuid) { if (!empty($uuid) && strlen($uuid) !== 16) { throw new Exception('Input must be a 128-bit integer.'); } $this->bytes = $uuid; // Optimize the most common use $this->string = bin2hex(substr($uuid, 0, 4)) . "-" . bin2hex(substr($uuid, 4, 2)) . "-" . bin2hex(substr($uuid, 6, 2)) . "-" . bin2hex(substr($uuid, 8, 2)) . "-" . bin2hex(substr($uuid, 10, 6)); } /** * @param int $ver * @param string $node * @param string $ns * @return Uuid * @throws Exception */ public static function generate($ver = 1, $node = null, $ns = null) { /* Create a new UUID based on provided data. */ switch ((int)$ver) { case 1: return new static(static::mintTime($node)); case 2: // Version 2 is not supported throw new \Exception('Version 2 is unsupported.'); case 3: return new static(static::mintName(static::MD5, $node, $ns)); case 4: return new static(static::mintRand()); case 5: return new static(static::mintName(static::SHA1, $node, $ns)); default: throw new \Exception('Selected version is invalid or unsupported.'); } } /** * Generates a Version 1 UUID. * These are derived from the time at which they were generated. * * @param string $node * @return string */ protected static function mintTime($node = null) { /** Get time since Gregorian calendar reform in 100ns intervals * This is exceedingly difficult because of PHP's (and pack()'s) * integer size limits. * Note that this will never be more accurate than to the microsecond. */ $time = microtime(1) * 10000000 + static::INTERVAL; // Convert to a string representation $time = sprintf("%F", $time); //strip decimal point preg_match("/^\d+/", $time, $time); // And now to a 64-bit binary representation $time = base_convert($time[0], 10, 16); $time = pack("H*", str_pad($time, 16, "0", STR_PAD_LEFT)); // Reorder bytes to their proper locations in the UUID // $uuid = $time[4] . $time[5] . $time[6] . $time[7] . $time[2] . $time[3] . $time[0] . $time[1]; $uuid = $time[0] . $time[1] . $time[2] . $time[3] . $time[4] . $time[5] . $time[6] . $time[7]; // Generate a random clock sequence $uuid .= static::randomBytes(2); // set variant $uuid[8] = chr(ord($uuid[8]) & static::CLEAR_VAR | static::VAR_RFC); // set version $uuid[6] = chr(ord($uuid[6]) & static::CLEAR_VER | static::VERSION_1); // Set the final 'node' parameter, a MAC address /* if (!is_null($node)) { $node = static::makeBin($node, 6); } //If no node was provided or if the node was invalid, generate a random MAC address and set the multicast bit if (is_null($node)) { $node = static::randomBytes(6); $node[0] = pack("C", ord($node[0]) | 1); } $uuid .= $node; */ return bindec($uuid); } /** * Randomness is returned as a string of bytes * * @param $bytes * @return string */ public static function randomBytes($bytes) { return call_user_func(array('static', static::initRandom()), $bytes); } /** * Trying for openSSL and Mcrypt random generators. Fallback to mt_rand * Since laravel 4.* and 5.0 requires Mcrypt and 5.1 requires OpenSSL the fallback should never be used. * * @throws Exception * @return string */ public static function initRandom() { if (function_exists('openssl_random_pseudo_bytes')) { return 'randomOpenSSL'; } elseif (function_exists('mcrypt_encrypt')) { return 'randomMcrypt'; } // This is not the best randomizer (using mt_rand)... return 'randomTwister'; } /** * Insure that an input string is either binary or hexadecimal. * Returns binary representation, or false on failure. * * @param string $str * @param integer $len * @return string|null */ protected static function makeBin($str, $len) { if ($str instanceof self) { return $str->bytes; } if (strlen($str) === $len) { return $str; } else { // strip URN scheme and namespace $str = preg_replace('/^urn:uuid:/is', '', $str); } // strip non-hex characters $str = preg_replace('/[^a-f0-9]/is', '', $str); if (strlen($str) !== ($len * 2)) { return null; } else { return pack("H*", $str); } } /** * Generates a Version 3 or Version 5 UUID. * These are derived from a hash of a name and its namespace, in binary form. * * @param string $ver * @param string $node * @param string $ns * @return string * @throws Exception */ protected static function mintName($ver, $node, $ns) { if (empty($node)) { throw new Exception('A name-string is required for Version 3 or 5 UUIDs.'); } // if the namespace UUID isn't binary, make it so $ns = static::makeBin($ns, 16); if (is_null($ns)) { throw new Exception('A binary namespace is required for Version 3 or 5 UUIDs.'); } $version = null; $uuid = null; switch ($ver) { case static::MD5: $version = static::VERSION_3; $uuid = md5($ns . $node, 1); break; case static::SHA1: $version = static::VERSION_5; $uuid = substr(sha1($ns . $node, 1), 0, 16); break; default: // no default really required here } // set variant $uuid[8] = chr(ord($uuid[8]) & static::CLEAR_VAR | static::VAR_RFC); // set version $uuid[6] = chr(ord($uuid[6]) & static::CLEAR_VER | $version); return ($uuid); } /** * Generate a Version 4 UUID. * These are derived solely from random numbers. * generate random fields * * @return string */ protected static function mintRand() { $uuid = static::randomBytes(16); // set variant $uuid[8] = chr(ord($uuid[8]) & static::CLEAR_VAR | static::VAR_RFC); // set version $uuid[6] = chr(ord($uuid[6]) & static::CLEAR_VER | static::VERSION_4); return $uuid; } /** * Import an existing UUID * * @param string $uuid * @return Uuid */ public static function import($uuid) { return new static(static::makeBin($uuid, 16)); } /** * Compares the binary representations of two UUIDs. * The comparison will return true if they are bit-exact, * or if neither is valid. * * @param string $a * @param string $b * @return string|string */ public static function compare($a, $b) { if (static::makeBin($a, 16) == static::makeBin($b, 16)) { return true; } else { return false; } } /** * Get the specified number of random bytes, using openssl_random_pseudo_bytes(). * Randomness is returned as a string of bytes. * * @param $bytes * @return mixed */ protected static function randomOpenSSL($bytes) { return openssl_random_pseudo_bytes($bytes); } /** * Get the specified number of random bytes, using mcrypt_create_iv(). * Randomness is returned as a string of bytes. * * @param $bytes * @return string */ protected static function randomMcrypt($bytes) { return mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM); } /** * Get the specified number of random bytes, using mt_rand(). * Randomness is returned as a string of bytes. * * @param integer $bytes * @return string */ protected static function randomTwister($bytes) { $rand = ""; for ($a = 0; $a < $bytes; $a++) { $rand .= chr(mt_rand(0, 255)); } return $rand; } /** * @param string $var * @return string|string|number|number|number|number|number|NULL|number|NULL|NULL */ public function __get($var) { switch ($var) { case "bytes": return $this->bytes; // no break case "hex": return bin2hex($this->bytes); // no break case "string": return $this->__toString(); // no break case "urn": return "urn:uuid:" . $this->__toString(); // no break case "version": return ord($this->bytes[6]) >> 4; // no break case "variant": $byte = ord($this->bytes[8]); if ($byte >= static::VAR_RES) { return 3; } elseif ($byte >= static::VAR_MS) { return 2; } elseif ($byte >= static::VAR_RFC) { return 1; } else { return 0; } // no break case "node": if (ord($this->bytes[6]) >> 4 == 1) { return bin2hex(substr($this->bytes, 10)); } else { return null; } // no break case "time": if (ord($this->bytes[6]) >> 4 == 1) { // Restore contiguous big-endian byte order $time = bin2hex($this->bytes[6] . $this->bytes[7] . $this->bytes[4] . $this->bytes[5] . $this->bytes[0] . $this->bytes[1] . $this->bytes[2] . $this->bytes[3]); // Clear version flag $time[0] = "0"; // Do some reverse arithmetic to get a Unix timestamp return (hexdec($time) - static::INTERVAL) / 10000000; } else { return null; } // no break default: return null; // no break } } /** * Return the UUID * * @return string */ public function __toString() { return $this->string; } } $uuid = Uuid::generate(); echo($uuid);
based on BgfYp
Output for 5.4.0 - 7.2.0
30----