php redirect does not change URL

ghz 8months ago ⋅ 67 views

Hello I have a weird Problem with PHP and HTML. I made a Page with a contact form that contains a Buttons that redirects to a workings space that is only accessable when you are loged in. Else you are redirected to the login page. First my back button in under contact is defined like this:

<a href="https://myhompage.com/admin/index.php" data-role="button" data-icon="arrow-l" style="width: 60px;">Back</a>

Then in the index.php is a file called with require_once that checks if the session is valid or not. If valid do nothing if not reirect to login.php

header("Location: https://lmyhomepage.com/login.php", true, 302);
        exit;

I Tryed just ../login.php with and without the 2 variables. I Change code 302 to 303. I changed exit to die and nothing works right.

On Top of my index.php file is short entry:

<?php
require_once("check_session.php");
?>

Below that is only HTML and javascript The check_session.php looks like tihs:

    <?php
// Start or resume session
$a = session_id();
if ($a == '') session_start();
$key = "";
// Check if session ID is not present or valid
if (isset($_SESSION['sessionid']) && isset($_SESSION["key"])) {


    if ($_SESSION['sessionid'] != session_id()) {
        // Redirect to login page
        header("Location: https://myhomepage.com/login.php");
        exit;
    } else {
        require_once("includes/create-connection.php");
        $sqlAbfrage = "select id from rechte where schluessel = ?;";
        if ($sqlAbfrage = mysqli_prepare($verbindung, $sqlAbfrage)) {
    
            // UserID als Parameter für Abfrage übergeben ("i" bedeutet Integer)
            mysqli_stmt_bind_param($sqlAbfrage, "s", $_SESSION["key"]);
    
            // Abfrage ausführen
            mysqli_stmt_execute($sqlAbfrage);
    
            // Gespeicherten Startcode in Variable $ergebnisStartcode ablegen
            mysqli_stmt_bind_result($sqlAbfrage, $key);
    
            // Wert zuweisen
            mysqli_stmt_fetch($sqlAbfrage);
    
            // Abfrage schließen
            mysqli_stmt_close($sqlAbfrage);
    
        }
        if ($key == 2) {
            header("Location: ../user/index.php", true, 303);
            exit;
        }   else if ($key != 1) {
            header("Location: https://myhomepage.com/login.php");
            exit;
        }
    }
} else {
    // Redirect to login page
        header("Location: https://myhomepage.com/login.php");
        exit;
    }
?>

The URL in my browser says https://myhompage.com/admin/index.php while login.php is mostly loaded exept for js code and an image. The JS code is directly in the login.php implemented but does not work. If I press F5 or just normaly reload the page the URL Changes to https://myhompage.com/login.php like it is supposed to and then everything works fine. Through more testing I realized that my Homepage still believes it is in the /admin area and tries to load the image and the JS/CSS files from that folder into the login.php which in a folder on top. Project directory: HTML -> web (here is my login.php with css and js files) -> admin (hier is the index.php and the check_session.php and additional js and css files) Does anyone now where I go wrong?

Answers

It seems like your issue stems from how you handle redirects and URLs in your application. Let's break down the potential problems and suggest solutions:

  1. Redirect Loop or Incorrect Redirects:

    • Ensure that your redirection logic is correct and doesn't create a loop. Check if there are any conditions that could lead to multiple redirects.
    • Verify that the URLs in your header("Location: ...") calls are correct and point to the intended pages. Make sure you're using absolute URLs when redirecting across different directories.

  2. Session Handling:

    • Double-check your session management code (session_start(), checking session IDs, etc.) to ensure that sessions are started and maintained correctly across your pages.
    • Confirm that session variables are set and accessed accurately throughout your application.

  3. Relative URLs and File Paths:

    • When linking to resources like images, JavaScript, or CSS files, ensure that you're using correct relative paths or absolute URLs. In your case, if login.php is in a different directory from index.php, make sure the paths to your resources are adjusted accordingly.
    • For example, if your login.php file is located in a directory above your CSS and JavaScript files, you might need to adjust the paths in your HTML to navigate up one directory before accessing those resources.

  4. Headers and Output Buffering:

    • Ensure that no output is sent to the browser before calling header() for redirection. Output sent before headers will cause PHP to throw an error.
    • You might want to check for any whitespace or unintended characters before the <?php opening tag in your files, as these can cause output to be sent prematurely.

  5. Testing Environment:

    • Test your application thoroughly in different environments (local, staging, production) to ensure consistent behavior.
    • Use browser developer tools to inspect network requests, redirects, and errors. This can help identify any incorrect URLs or missing resources.

By carefully reviewing and debugging your code for these potential issues, you should be able to resolve the redirection problem and ensure that your application functions correctly.

#php