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']!="")