3v4l.org

run code in 500+ PHP versions simultaneously
<?php $a = range(1,100000); echo memory_get_usage(), "\n"; foreach ($a as $i => $v) { if (!$i){ echo memory_get_usage(), "\n"; $a[$i] = 111; echo memory_get_usage(), "\n"; } } echo memory_get_usage(), "\n";

preferences:
55.29 ms | 687 KiB | 5 Q