login/signup 'too many redirects' error

Question

I'm getting this annoying error which I can't seem to get rid of.

Relevant snippets:

index.php:

if(isset($_SESSION['isLoggedIn']) && $_SESSION['isLoggedIn']===true){
    $isLoggedIn = true;
}else{
    $_SESSION['isLoggedIn'] = false;
    header('Location: /signup');
}

signup.php:

if(isset($_SESSION['isLoggedIn']) && $_SESSION['isLoggedIn']===true){
    header('Location: /');
} else {
    $_SESSION['isLoggedIn'] = false;
}

I get redirected to signup.php page, but after that get too many redirects error. In server logs, there are just 302 redirects to signup.php page. I'm not redirecting anywhere else in signup.php .

Where could this error come from?

Answer 1

Your header('Location: /signup'); is failing because the file is actually called signup.php and /signup is a folder.

and is interpreted as: /go_to_root/signup/index.php

Since that folder doesn't exist, it's looping over from a most likely 404 and to an index file.

Therefore, you need to make it read as

header('Location: /signup.php');

and add exit; after each header, otherwise, your code will continue to execute.