3v4l.org

run code in 300+ PHP versions simultaneously
<?php for ($i = 0; $i < 10; $i++) { eval('return function() {};'); gc_collect_cycles(); $new = memory_get_usage(); if (isset($old)) { echo ($new - $old) . "\n"; } $old = $new; }

preferences:
24.78 ms | 402 KiB | 5 Q