Online PHP editor | refs for kXrgS

<?php function uuid($c = 4) { $x = function($c) { for ($n = ''; strlen($n) < $c + 1; $n = $n.base_convert(mt_rand(), 10, 16)); return substr($n, -$c); }; return (microtime(true) * 10000).'-'.$x($c).'-'.$x($c).'-'.$x($c).'-'.$x($c).'-'.$x($c).'-'.$x($c) ; return sprintf( '%x-%s-%s-%s-%s%s%s', microtime(true) * 10000, $x($c), $x($c), $x($c), $x($c), $x($c), $x($c) ); } $time = microtime(); $uuids = array(); for ($i = 0; $i < 100; $i++) { $uuids[] = uuid(); } if (count(array_unique($uuids)) != count($uuids)) { echo 'DUPLICATED'; } else { echo 'No duplicate'; print_r($uuids); }