$key = key($_GET);

print_r($key);

$len = 6;

if($key == ""){

$chars='ABDEFGHJKLMNPQRSTVWXYabdefghijkmnpqrstvwxy0123456789#%*'; // characters to build the password from
mt_srand((double)microtime()*1000000*getmypid()); // seed the random number generater (must be done)
$password='';
while(strlen($password) $password.=substr($chars,(mt_rand()%strlen($chars)),1);

$key = $password;
$md5key = md5($key);