Please help! How to use PHP snippet for html?

Please help!
A small php file at bottom is to open a pop up window.
How to use it in when click on a link.

For example, if this is javascript, it looks like this in html:
Open a popup window

How to call the PHP snippet in html tag???

Please help!

fileName: test.snippet.php
<?php
function newPopup() {
url = ‘http://www.yahoo.com&#8217;
popupWindow = window.open(
url,’popUpWindow’,’height=700,width=800,left=10,top=10,resizable=yes,scrollbars=yes,toolbar=yes,menubar=no,location=no,directories=no,status=yes’)
}
?>

http://wordpress.org/extend/plugins/php-snippets/