- substr: documentation ( source)
- str_shuffle: documentation ( source)
<?php
function rand_string( $length ) {
$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
return substr(str_shuffle($chars),0,$length);
}
echo rand_string(8);