Update session cookie to last 12 hours.

Author: Dan Cryer

public/index.php

@@ -7,6 +7,7 @@
 * @link         https://www.phptesting.org/
 */
 
+session_set_cookie_params(43200); // Set session cookie to last 12 hours.
 session_start();
 
 require_once('../bootstrap.php');