Hannes Magnusson has a new post today about an interesting feature of the PHP documentation some might not have known existed - manual pages (man) for PHP functions/methods for unix systems.
For a while I had vim configured to run reflection when I hit "K", but after the PHP documentation team released unix manual pages for PHP I now get the manual page in all its glory; function description, parameter descriptions, return values, examples, notes, see also and everything you are used to see from the online manual. Its awesome.
These manual pages aren't installed by default, so you'll have to grab the download from the PEAR channel for the PHP documentation (doc.php.net/pman). If you're wanting to use it in VIM, you'll also need to change the keywordprg setting to "pman".