3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = 0; $y = 0; $x = memory_get_usage(); $s = str_repeat('c', 1200); $y = memory_get_usage(); echo $y - $x, PHP_EOL; $s1 = (string)$s; $x = memory_get_usage(); echo $x - $y, PHP_EOL;

preferences:
30.52 ms | 402 KiB | 5 Q