3v4l.org

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

preferences:
33.11 ms | 402 KiB | 5 Q