Contains tutorials, references and many other PHP resources.
Developer Shed's Apache PHP Installation Instructions.
Contains Documentation, articles, forums and more about PHP.
Contains PHP Code contributed from various sources.
Zend Technologies provides the supporting PHP engine along with PHP based solutions and provided PHP documentation and other resources.
An online tutorial for PHP.
Contains PHP links.
Includes several great tutorials on beginning PHP.
Includes several documents including a large online and downloadable manual. This is the main manual needed to write PHP code.