3v4l.org

run code in 300+ PHP versions simultaneously
<?php function uuid($c = 4) { $x = function($c) { for ($n = ''; strlen($n) < $c + 1; $n = $n.mt_rand()); return substr($n, -$c); }; return sprintf( '%s-%04d-%04d-%04d-%04d%04d', microtime(), $x($c), $x($c), $x($c), $x($c), $x($c), $x($c) ); } $time = microtime(); $uuids = array(); for ($i = 0; $i < 10000; $i++) { $uuids[] = uuid(); } if (count(array_unique($uuids)) != count($uuids)) { echo 'DUPLICATE'; } else { echo 'No duplicate'; print_r($uuids); }

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

VersionSystem time (s)User time (s)Memory (MiB)
7.2.00.0030.04322.98
7.1.70.0240.03720.76
7.1.60.0070.05821.53
7.1.50.0070.05420.93
7.0.200.0140.03520.72
preferences:
29.68 ms | 400 KiB | 5 Q