From SitePoint.com today, there's a new piece entitled Introducing PHP 5's Standard Library. It goes into some detail about an extension that snuck in the back of the PHP world - the Standard PHP Library.

Although work is still in progress, the Standard PHP Library's current offering significantly increases the chances of getting PHP developers to agree on something (thereby increasing the chances of code re-use). It may also make your cunningly constructed class interface very easy for other people to use, as the SPL extension makes it possible to "overload" basic PHP syntax and make objects look like normal PHP arrays.

He goes on to talk about how to utilize this extension (introduction, looping, seeing objects as arrays, and a "why you gotta like it" section). With multiple interfaces and classes, there's plenty of functionality to work through. There's even a little talk about the future of the extenson.