Setting things straight ... PHP began life as "Personal Home Page" (Tools), and later the "Personal Home Page" (Construction Kit). Later it would be merged with an SQL query tool for webpages and become PHP/FI, or "Personal Home Page / Form Interpreter". FastForward to the present day and it's no longer a mere tool to handle generation of Personal Home Pages, reuiring a new acronym, some clever chap came up with: "PHP: Hypertext Preprocessor" Cunningly (or not), in the same vein as "GNU's not Unix" and "PINE Is Not Elm", PHP became a recursive acronym, whereby the first letter actually stands for the full acronym. Deep, huh?
Cooperative multitasking using coroutines (in PHP!)
One of the large new features in PHP 5.5 will be support for generators and coroutines. Generators are already sufficiently covered by the documentation and various other blog posts (like this one ...Nickic on PHP