Handling situation where User closes browser in php
<p>I have a buy.php page where user selects a product, enters some data like his name, address etc. Next he clicks on the "Buy" button to move to the Payment Gateway site for inputting his Credit Card no + CVV no etc. And at this point, without clicking on the 'Pay' button on this page, he closes the browser or his Computer gets switched off. This Transation ID is saved in Session.</p>

<p>How to track this situation and save it as "User Aborted" against his transaction ID in the Database in PHP?</p>
