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### 3.17.4. user_session_destroy

Allow modules to override Phorum's session destroy management or to even fully omit destroying a session (for example useful if the hook ??? is used to inherit an external session from some 3rd party application).

Call time:

Just before Phorum runs its own session destroy code in the user API function `phorum_api_user_session_destroy()`.

Hook input:

The session type for which a session must be destroyed. This can be either `PHORUM_FORUM_SESSION` or `PHORUM_ADMIN_SESSION`.

Hook output:

Same as input if Phorum has to run its standard session destroy code or NULL if that code should be fully skipped.

Example code:

See the ??? hook for an example of how to let Phorum setup the PHP session that is destroyed in this example hook.

    function phorum_mod_foo_user_session_destroy($type)
    {
        // Let Phorum handle destroying of admin sessions on its own.
        if ($type == PHORUM_ADMIN_SESSION) return $type;

        // Override the session handling for front end forum sessions.
        // We could for example have stored the session in a standard
        // PHP session. First, we start a PHP session if that was
        // not done yet.
        if (!session_id()) session_start();

        // After starting the PHP session, we can clear the session
        // data for the Phorum user. In the user_session_create hook
        // example code, we stored the user_id for the active user
        // in the session. Here we clear that data. We could also
        // have destroyed the full PHP session, but in that case we
        // would risk destroying session data that was setup by
        // other PHP scripts.
        unset($_SESSION['phorum_user_id']);

        // Tell Phorum not to run its own session destroy code.
        return NULL;
    }

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