3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 'abcdefghijklmnopqrstuvwxyz0123456789'; for ($x=0,$r=null;$x<8;$x++) { $r .= substr(0, srtlen($a - 1)); } echo $r;

preferences:
65.5 ms | 402 KiB | 5 Q