When I try to execute auth_user.php, code of Chapter 11, after click on Login button, I can see the same page with the blank field.

This topic is valid for Chapter 11 of PHP5 GUIDA PER LO SVILUPPATORE,language italian, but the code is the same. Please help me to resolve this topic.

This is a relatively old post, but I just recently started to use this book and found the same errors listed here. Is there anyone out there who can help?

I suspect part of the problem is in the Code:


if(!isset($userid)) {
   login_form();
   exit;


I think the $userid should be $_POST['userid']


Also there is a problem in the SQL statement for:

$query = "SELECT username FROM $user_tablename
                             WHERE userid = '$userid'
                             AND userpassword = password('$userpassword')";

This SQL statement is not even valid by itself.

Does anyone have any tips? Thanks