3v4l.org

run code in 300+ PHP versions simultaneously
<?php function randomReceipt(){ $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; return substr(str_shuffle(str_repeat($pool, 5)), 0, 8); } echo randomReceipt();

preferences:
36.6 ms | 402 KiB | 5 Q