Xammp/php: cant find file path

I use brackets for editing and live previewing my code, but when I change the names of my folders live preview doesn't work. Here is the error message:

Warning: require(header.php): failed to open stream: No such file or directory in D:\Programmering\Xammp\Files\htdocs\webside1\pages\index.php on line 13 Fatal error: require(): Failed opening required 'header.php'

(include_path='D:\Programmering\Xammp\Files\htdocs\webside1\pages/../') in D:\Programmering\Xammp\Files\htdocs\webside1\pages\index.php on line 13

Here is my index.php code:

<!DOCTYPE html>
<html>
    <title>Home - Awt-technologies</title>
    <link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap-theme.min.css">
    <link rel="stylesheet" href="style.css">
    <script src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.js"></script>

    <body id="indexbody">
        <?php //include_once('D:\Programmering\Xammp\Files\htdocs\webside1\pages\header.php');
        set_include_path(dirname(__FILE__)."/../");
        require 'header.php';
        //Checks if user is logged in
        if(isset($_SESSION['name'])) {
            include_once "templates\loggedin.php";
        }
        ?>

    </body>
</html>

I checked the path and it should work but doesn't. Here is a picture of my files in brackets:

Solution

Your index.php is in a different folder than your header.php file.

You'll need to change the require path to ../templates/header.php.