Salve ho il seguente code per efffetuare un login:
<?
require_once('conf.inc.php');
require_once('functions.php');
$tipo="";
// ---
// login, check user
// ---
function login($username,$pass)


{
GLOBAL $db,$table,$table1,$tipo;

$query = mysql_query("SELECT * FROM $table tutorial_user_auth WHERE userName = '$username' AND userPassword = '$pass'");

if (mysql_num_rows($query)== " ")
{
$query = mysql_query("SELECT * FROM $table1 admin_user_auth WHERE userAdmin = '$username' AND passAdmin = '$pass'");
$tipo="ADMIN";

}
else $tipo="USER";

return mysql_num_rows($query);


}


// decisional switch
// ---
if(isset($HTTP_POST_VARS["action"]))
{
switch($HTTP_POST_VARS["action"])
{

case "login":
$result = login($HTTP_POST_VARS['username'],$HTTP_POST_VARS['pass']);

//$result = login($HTTP_GET_VARS['username'],$HTTP_GET_VARS['pass']);
print "user=$result&tipo=$tipo";
break;


}
}
?>
va tutto ok solo vorrei aggiungere un controllo nel caso nelle query non trova niente,ed associarlo ad un valore,grazieeeeee