PHP Session problem

Question

Hi I'm learning PHP. Using xampp i'm testing codes, and register_globals is ON. Just wrote a simple code to test session, but it doesn't work i don't know why !? Admin with pass 123 logs in correctly but when i click to go to admin area, it returns me to the login page, because the session doesn't seem to be set:

This is the check.php page:

<?php
session_start();
    $u = $_POST['tfUser'];
    $p = $_POST['tfPass'];
    if (($u == "admin") && ($p == "123"))
    {
        print ("Okay! Go to Admin area "."<a href='admin.php'>Click Here</a>");
        $_SESSION["testSession"] = $mySession;  
    }
    else
    {
        print ("Nope !");
    }
?>

This is the admin.php page:

<?php
    session_start();
    if (isset($_SESSION["testSession"]))
    {
        echo "Hello !";
    }
    else
    {
        echo '<script language="javascript">
        window.location.href="login.php";
        </script>';
        return;
    }
?>

Answer 1

Check that $mySession is defined and isn't null. isset will return false if the variable is set to null

Answer 2

use this

<?php
session_start();
    $u = $_POST['tfUser'];
    $p = $_POST['tfPass'];
    if (($u == "admin") && ($p == "123"))
    {
        print ("Okay! Go to Admin area "."<a href='admin.php'>Click Here</a>");
        $_SESSION["testSession"] = $u;  // or something else (string, or any other var which must be having some values) 
    }
    else
    {
        print ("Nope !");
    }

You are using $mysession which is not initialized, so it will be set to null.

Answer 3

Set your error reporting on:

error_reporting(E_ALL);
ini_set('display_errors', '1');

You get a similar error as your mySession var isn't defined.

Notice: Undefined variable: hey in /test.php on line 8

Oh, and as long as you are leaning PHP, get rid of the JavaScript and go with:

header('Location: login.php');

It will have the same result, even if someone has JavaScript turned off.