if(isset($_POST['submit']) && $_POST['firstname']!="" && $_POST['lastname']!="" 
                           && $_POST['mnumber']!="" && $_POST['email']!="" && $_POST['password']!="")
 
 if(isset($_POST['submit']) && $_POST['firstname']!="" && $_POST['lastname']!="" 
                           && $_POST['mnumber']!="" && $_POST['email']!="" && $_POST['password']!="")