phpThumbs is a great script for resizing images on the fly. The script lets you create thumbnails or other variations of an original image simply by calling a specially crafted URL.

<img src="../phpThumb.php?src=images/disk.jpg&w=200" alt="">

That line of code will produce a resized version of the original at a width of 200 pixels. Easy as. The only drawback, however, is that phpThumbs can be slow, even with caching.

Mr. Php has a great solution that solves phpThumb’s speed issues. It’s easy to implement and really makes phpThumbs a robust solution for nearly any situation.