3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "abcdefghijklmn"; $print = strrev($str); $st=""; for($i = 0;$i<$print.length;$i=$i+2) { $st .= substr($print,$i,$i+1); echo $st; }

preferences:
30.61 ms | 402 KiB | 5 Q