3v4l.org

run code in 300+ PHP versions simultaneously
<?php function randomString($length, $chars="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") { $length = min($length, 255); $string = ''; while (strlen($string) < $length) { $string .= $chars[mt_rand(0, strlen($chars)-1)]; } return $string; } echo randomString(10);

preferences:
26.31 ms | 402 KiB | 5 Q