Why Am I Redirected to index.php After Logging In Instead of My Previous Page?

Redirecting to Previous Page After Login

When logging into a website, it's often convenient to be redirected back to the page the user was viewing before they logged in. This question explores a code issue where users are redirected to index.php instead of the intended page.

In the sample code provided, the login-check.php script determines login status and sends a redirect parameter (p) to the login.php page. However, instead of sending users to the desired page, it redirects them to index.php.

To resolve this issue, the following solution is proposed:

1. Pass User's Current Page as a Query String:

   • Modify the login form to include a hidden input field that stores the user's current page. This can be done by passing the $_SERVER['REQUEST_URI'] in the login.php script.
   • For example, if a user is reading an article (comment.php?articleid=17) and attempts to leave a comment, the URL would be modified to:
     login.php?location=comment.php?articleid=17

2. Handle "Location" Query String in login-check.php:

   • In the login-check.php script, check if the $_POST['location'] is populated. If it is, store it in a $redirect variable.

3. Redirect Based on Login Status and Location:

   • If login is successful, check if a redirect URL is available in $redirect. If so, redirect the user to that page. Otherwise, redirect them to index.php.
   • If login fails or the user is already logged in, handle the appropriate error messages or redirect as needed.
4. Validate Redirect URL:
   It's important to validate the $_GET['location'] value before redirecting the user to ensure they're not attempting to access malicious URLs.
5. Encode Query String:
   Use urlencode when passing URLs as $_GET parameters to properly encode special characters.

By implementing these changes, users will be successfully redirected to the page they were previously viewing after logging in, ensuring a seamless user experience.

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