As mentioned on the Zend Developer Zone and by John Herren, Yahoo! has added a new feature to its Pipes functionality - serialized PHP results.

Until now JSON output has been the only way to obtain all the data flowing through a Pipe. Starting today we've added a second way of getting all the data - serialized PHP Pipe output. [...] It's then up to you on how you want to display or use the Pipe data. The possibilities are endless.

If you haven't messed with Yahoo's Pipes system, you owe to it to yourself to at least go and play with it for a little bit.

On his blog, Dan Scott notes that the PHP language will be getting a native doubly-linked list structure in the coming days (as mentioned by Etienne Kneuss).

This is fabulous news; when I wrote the File_MARC PEAR package, I ended up having to implement a linked list class in PEAR to support it.

Doubly linked lists are normal lists, but the elements also have links to both the previous and next items in the list as well. Two other structures will be added right along with it - SplStack and SplQueue.