#random char generator !
function mbs_rand( $charLength="20" ){
$key = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
$chLn = strlen($key);
$randKey='';
for ($i = 0; $i < $charLength; $i++) {
$randKey = $randKey."".$key[rand(0, $chLn - 1)];
};
return $randKey;
}

#kullanımı
echo mbs_rand(5)