php会话计时器在同一页面上刷新（就业表格）

OK, here is what I have setup.

• Basic jquery timeout check set 10 minutes before.
• PHP page that is called upon being confirmed that they want to keep the session open.

What I don't know how to do.

• Refresh the session time so that it won't timeout for x time. Each time the user states they want to keep the session open.

  session_check_timeout();
  });
   function session_timeout() {
      if (confirm('Your session will end in 10 minutes do you want to refresh your session?')) {
      $.ajax({
          url: '<?php echo ROOT_URL; ?>php/content/careers/refresh_session.php',
          success: function (data) {
              session_check_timeout();
          }
      });
  }
  }
   function session_check_timeout(){
  setTimeout(session_timeout, 5000);
  }