There are different documentation teams operating somewhat independently on PHP.net subprojects. Only a few people are involved in more than one documentation project currently, and that limits the know-how sharing, which would otherwise be possible and desirable. All of the documentation teams use an early fork of the original PHP manual build system. These systems evolved independently, and took over some improvements from the others on an occasional basis (the PEAR documentation team uses a variant of the revcheck developed for phpdoc for example). This site is aimed at getting documentation efforts closer, and provide more tools and information for manual authors and translators.
The developers of PHP extensions all have access to the PHP documentation modules, although the different projects have different policies of accepting contributions. You are welcome to join our efforts! Authoring documentation for an extension is the second best thing to implementing the extension itself if you are interested in the capabilities, features and usage possibilities even in extreme conditions. We also have translated versions of the different manuals, and most of the translation teams are always in need of more helping hands. In case you are interested, you should contact the relevant mailing lists. The projects and translations have separate mailing lists.
Currently only the PHP Manual itself uses this site, see the PHP section for details.