I’ve found an excellent PHP Thumbnailer Class which lets you manipulate images easily. Beside usual functions you’d expect from thumbnailer class (such as resize and crop) it also has ability to create thumbnails on the fly or to save them. You can see it in action on PHP Thumbnailer demo page.
Chris Shiflett wrote an article on the topic of PHP sessions and ways to implement secure sessions or at least more secure then ordinary PHP session mechanism. Article is called “The Truth about Sessions” and has been published in PHP Magazine. It can be useful both for novice and experienced programmers because it starts with [...]