PHP is the best documentation viewer for iOS, and a great resource for any PHP developer. Use it to easily search and browse the complete PHP.net reference manual offline and in any language*, tap links to related resources, and favorite frequently viewed documents. It features a simple interface, a clean theme, and a wide reading view in landscape.
Now a universal application for the iPad, iPhone and iPod touch!
*See http://www.php.net/download-docs.php for a list of supported languages.