Dieser Codeschipsel hilft dabei, ein Zufalls-Passwort aus vorgegebenem String zu erzeugen.
function random_password($length, $characters='abcdefgh1234567890'){
if ($characters == ''){ return ''; }
$chars_length = strlen($characters)-1;
mt_srand((double)microtime()*1000000);
$pwd = '';
while(strlen($pwd) < $length){
$rand_char = mt_rand(0, $chars_length);
$pwd .= $characters[$rand_char];
}
return $pwd;
}