PHP link to reveal a form

1 This page shows a link which when clicked will show a form below the link.

The link: Form 1

This paragraph should be below the form after the link is clicked.

Revised code

error_reporting(0); inside PHP tags not required with this code except as a safety measure to prevent errors or warnings (if any) showing username being displayed on the web page.
<a href="php-show-form.php?f=form1">Form 1</a>
<?php
error_reporting(0);
if ($_GET['f']) {include ($_GET['f'].".inc");}
?>

(Credit to djlebarron for the code.)