3v4l.org

run code in 300+ PHP versions simultaneously
<?php $cases = array(false, 0, 1, 2, 3, 4, 5, true, null); $cnt = count($cases); $ln = 111111; $s = microtime(true); for ($i = 0; $i < $ln; $i++) { foreach ($cases as $c) { $c = !!$c; } } echo 'ok';

preferences:
29.63 ms | 402 KiB | 5 Q