3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string1 = 'abcdefghijklmonpqrst'; for($i = 1; $i <= 200000; $i++) { $x=$i * 5; $x=$x + $x; $x=$x/10; $string3 = $string1 . strrev($string1); $string2 = substr($string1, 9, 1) . substr($string1, 0, 9); $string1 = $string2; } ?>

preferences:
43.58 ms | 402 KiB | 5 Q