3v4l.org

run code in 300+ PHP versions simultaneously
<?php $pass = str_repeat('a', 1024 * 512); echo strlen($pass . $pass), "\n"; echo memory_get_peak_usage(), "\n", memory_get_peak_usage()/(1024*1024) . 'MB';

preferences:
36.79 ms | 402 KiB | 5 Q