Creating a PNG with PHP. This could be expanded to create a security image for use in forms to check for robots. Just set $string to a randomly generated string. From php.net: "This example would be called from a page with a tag like: <img src="button.php?text=text">. The above button.php script then takes this "text" string and overlays it on top of a base image which in this case is "images/button1.png" and outputs the resulting image. This is a very convenient way to avoid having to draw new button images every time you want to change the text of a button. With this method they are dynamically generated." This script taken from the PHP manual (http://www.php.net/manual/en/ref.image.php).