Why Does Session Data Disappear in Chrome But Not Other Browsers?

Session Data Loss in Chrome

In an issue mirroring that of a previous post, a PHP/MySQL developer encountered session data loss specifically in Google Chrome. Despite ensuring proper session initialization, the issue persisted, with session data disappearing in Chrome but remaining intact in other browsers like Firefox.

The developer confirmed that the session identifier cookie was being transmitted, but a specific session variable ($_SESSION['last_viewed_element']) was lost. Attempting to set other session variables also proved futile.

Resolution

After thorough troubleshooting, the root cause was traced to an unrelated 404 status code triggered by a missing favicon.ico in Chrome. The 404.php handler inadvertently modified session variables, leading to the loss of intended session data.

By eliminating the 404 error, the session data loss ceased, hinting at the peculiar sensitivity of Chrome to certain HTTP status codes and their impact on session management. This issue highlights the importance of meticulous debugging and the interconnectedness of seemingly unrelated elements in web application development.

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