PHP session lost after redirect

Losing PHP sessions after a redirect can occur due to various reasons, but it’s typically related to improper session handling or configuration. Here are some steps you can take to troubleshoot and resolve the issue:

1. Check Session Initialization: Make sure you’re properly initializing sessions on every page that requires session data. Use session_start() at the beginning of each page where you need to access session variables.
2. Check Cookies and Headers: Sessions in PHP usually rely on cookies to maintain session state. Ensure that your server is sending the appropriate session cookies and headers. Make sure you’re not sending any output (including whitespace) before calling session_start().
3. Verify Redirect Mechanism: The way you’re performing the redirect matters. If you’re using the header() function for redirection, it’s crucial that there’s no output sent before the headers are set. If output is sent before the headers, they won’t be properly set and the session information might not be carried over to the next page.

   Example of correct redirection:

   <?php
   session_start();
   // ... (other code)
   header("Location: new_page.php");
   exit();
   ?>