This PHP class is a growing collection of small spiders and web bots that go out on the web and make some small useful jobs. This help builds your spider php script and brings new functionalities to your works. You can do very nice works with CURL using php and this class, this small web bots can be included in your works.
You can play with interactive demos here.
Here is a tutorial on how to build a spider.
Here are some online tools made using this php class: