The PHP.net website has a note posted about the restructuring of the manual

A few weeks ago the manual was restructured to improve navigation and make room for per-extension chapters and usage examples along with improved documentation for object oriented extensions.

Changes were made in the function reference and in the predefined variables and context options/parameters sections as well as information on upcoming features like namespaces, late static bindings and Phar (to be included in PHP 5.3). The manual is now covered by the CreativeCommons Attribution license.