Official PHP Coding Standards

Download the php official coding standard documentation in pdf format from here

This file lists several standards that any programmer, adding or changing code in PHP, should follow. Since this file was added at a very late stage of the development of PHP v3.0, the code base does not (yet) fully follow it, but it’s going in that general direction. Since we are now well into the version 4 releases, many sections have been recoded to use these rules.