[Solved] Submit returning a blank page

by


try

if($_SERVER['REQUEST_METHOD']=="POST"){

or

if(isset($_POST['update'])){

instead of

 if (isset($_POST['Submit'])) {

the name of the submit button is update not Submit on your form

also stop using mysql_* functions. If you have to use them for now, at least escape the inputs properly before inserting them to database.

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solved Submit returning a blank page