• The PHP3 FAQ is your first stop for general information and those questions that seem to be on most people's minds.
• Read what has changed since PHP/FI 2.0
• PHP 3.0 Manual Online. Your reference to everything that's great about PHP. (The manual is approximately 90% complete.)
• PHP 3.0 Annotated Manual. This is the same as the above, except there is a built-in errata/note system that users all around the world can (and have!) contributed to.
• PHP 3.0 Manual Errata. This is the collected errata from the on-line errata/note system.
• PHP/FI 2.0 Manual. This includes discussions on a few topics that aren't covered in the PHP 3 manual yet.
• Getting a CVS account. If you wish to help out with the development of PHP, read this.