/**
* Generate a GUID string
* @link http://php.net/manual/en/function.random-int.php#118636
* @return string
*/
function guid () {
/** @var string $uid */
return sprintf ( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
// 32 bits for "time_low"
random_int ( 0, 0xffff ), random_int ( 0, 0xffff ),
// 16 bits for "time_mid"
random_int ( 0, 0xffff ),
// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 4
random_int ( 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
random_int ( 0, 0x3fff ) | 0x8000,
// 48 bits for "node"
random_int ( 0, 0xffff ), random_int ( 0, 0xffff ), random_int ( 0, 0xffff ) );
}
/*************
* EXAMPLE
************/
var_dump ( guid () );
/*************
* OUTPUT
************/
# (string) '35cf783a-e866-4956-871c-6af2ef6f7bc9'