title: Refresh sessions shopping cart using AJAX
body: <p>I have a shopping cart that use sessions to store items , 
  so I'm using AJAX to send the product ID with XMLHttpRequest .</p>
  
  <p>the items page and the cart in the same page .
  so after send the variables to the same page and set sessions , nth happen until i refresh the  page to see the difference .</p>
  
  <p>How i can see the difference in the cart without refreshing the PHP page  ?</p>