<!DOCTYPE html>
<html>
<body>
<?php
// Make the URL rewriter affect <a href> and <form> tags
ini_set('url_rewriter.tags','a=href,form=');
// Add a variable
output_add_rewrite_var('var', 'value');
// Output a link and a form
echo '<a href="">This link\'s URL will have a variable</a>';
echo '<form>';
echo '<p>This form will have a hidden input</p>';
echo '<input type="text" name="hello">';
echo '</form>';
?>
</body>
</html>