3v4l.org

run code in 300+ PHP versions simultaneously
<?php $time = microtime(true); $memo = memory_get_usage(true); // BEGIN $x = str_repeat('0', 1024*1024); $y = $x; // END $memo = memory_get_usage(true) - $memo; $time = microtime(true) - $time; echo sprintf("%dms - %.2fmo", $time*1000, $memo/1024/1024);

preferences:
31.91 ms | 402 KiB | 5 Q