Avoiding cross site scripting
<p>AM a newbie in php, i have seen some web applications that have only index.php showing on the browsers address path, when you put the mouse pointer, you would see that the links show with together with the variables required for the next page. However when you click on the link, the address bar would still show index.php. If one enters the variables directly on the address bar, then it takes you back to the home page.</p>

<p>How is this done?</p>
