Ignoring if statement

Question

I have a facebook login system that seems to work fine, but I want to redirect to the home page if the user is logged in. SO this is the top of my page

<?php
session_start();

if(!empty($_SESSION)){
 header("Location: home.php");
}

But that gets ignored and it runs the login script as if $_SESSION is empty, even tho I print the Session array on the home page and it always shows it has values, plus the rest of the script assigns session values anyway. Even if I change it to if (empty($_SESSION)) or add a else { die()} after it, it just completely ignores it.

Now if I add anything to print the session either using print_r($_SESSION) or echo'ing a particular value, even if I place this out side of the if statement, it seems to realise that the $_SESSION has a value and does the redirect. I could just put that there permanently as it would never appear...but I would rather figure out why it isn't working now.

Answer 1

You should add die() or exit() in the if block or the rest of the script will continue executing.

Answer 2

if(!empty($_SESSION['loggedIn']){ header("Location: home.php"); die(); }

Answer 3

If you don't interrupt the script it will, well, run until the end:

<?php
session_start();

if(!empty($_SESSION)){
    header("Location: home.php");
    exit;
}

Answer 4

You've got it pretty much right, it should look like this:

<?php
    session_start();

    if(isset($_SESSION)){
        header("Location: home.php");
        exit;
     }

Use isset() instead of empty(). Also, shouldn't the session var looks something like this?

$_SESSION['logged_on'];