This code snippet will allow you to generate thumbnails of images by visiting a URL such as yoursite.com/thumbs/images/myimage.100x100.jpg. This will create a 100px * 100px thumbnail of yoursite.com/images/myimage.jpg. The image will be stored on your server in yoursite.com/thumbs/images/myimage.100x100.jpg so the next request for the same image will be loaded without loading php. This will give you a very fast image caching system.