3v4l.org

run code in 300+ PHP versions simultaneously
<?php $n = 38; $c = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890-_'; for ($x=0; $x<$n; $x++) { $r .= substr($c, mt_rand(0, strlen($c) - 1), 1); } echo $r;

preferences:
31.04 ms | 402 KiB | 5 Q