session - why would session_set_save_handler not be working PHP 5.2

Here's the code, I'm making an educated guess that sess_read gets called when a session var is assigned. It is assigning the value. Is there a way I can test this?

 function sess_open($sess_path, $sess_name) {


        return true;
    }

    function sess_close() {
        return true;
    }

    function sess_read($sess_id) {

        echo "TEST";
        $result = mysql_query("SELECT Data FROM sessions WHERE SessionID = '$sess_id';");
        if (!mysql_num_rows($result)) {
            $CurrentTime = time();
            mysql_query("INSERT INTO sessions (SessionID, lastseen) VALUES ('$sess_id', $CurrentTime);") or die(mysql_error());

            return '';
        } else {
            extract(mysql_fetch_array($result), EXTR_PREFIX_ALL, 'sess');
            mysql_query("UPDATE sessions SET lastseen = $CurrentTime WHERE SessionID = '$sess_id';");
            return $sess_Data;
        }
    }

    function sess_write($sess_id, $data) {


        $CurrentTime = time();
        mysql_query("UPDATE sessions SET Data = '$data', lastseen = $CurrentTime WHERE SessionID = '$sess_id';");
        return true;
    }

    function sess_destroy($sess_id) {
        mysql_query("DELETE FROM sessions WHERE SessionID = '$sess_id';");
        return true;
    }

    function sess_gc($sess_maxlifetime) {
        $CurrentTime = time();
        mysql_query("DELETE FROM sessions WHERE lastseen + $sess_maxlifetime < $CurrentTime;");
        return true;
    }

    session_set_save_handler("sess_open", "sess_close", "sess_read", "sess_write", "sess_destroy", "sess_gc");
    session_start();
    ini_set('session.gc-maxlifetime', 60);
    $_SESSION['foo'] = "bar";
    $_SESSION['baz'] = "wombat";
Copy code

echo $_SESSION['baz'];

//^^^^This returns wombat but why isn't thesess_read being called?

EDIT

OK solved it by first of all checkingsession_get_save_handler was working using ordie()

Then setsession_destroy() before calling it - this solved the problem. The session had already started in an include somewhere else