People submit questions and others answer, all duties are very open and public to all. In short, this is an open PHP Knowledge Base. Both online and hard-copy versions are available. PHP Tutorials at LinuxGuruz - Features tutorials and tips about installing PHP on Linux and PHP coding tricks. Hidden within this archive are answers to just about every PHP question that comes up.
MARC archives many related lists too.
Be sure to read the user comments. The focus of these articles is to explain how PHP works for technical users. Article subjects range from PHP internals to features and techniques for the PHP developer.