http://www.php.net/ is an excellent source, including the official current documentation, as well a jumping-off point from its list of links. It is also a nice example of PHP in action, with DHTML, CSS and JavaScript generated on the fly by PHP. PHP source is available.
The mailing list is populated by many people who know a lot about PHP. Send mail to php3-subscribe@lists.php.net with whatever you want in the subject and body of the message to join. Do the same to php3-unsubscribe@lists.php.net to leave. Traffic is fairly heavy, currently about 100-200 messages a day.
There are only a couple of books about PHP at the time of this writing, and they are not getting rave reviews on the mailing list. More titles are supposed to be on the way.
http://www.mysql.com/ is the source for MySQL.
All listings referred to in this article are available by anonymous download in the file ftp://ftp.ssc.com/pub/lj/listings/issue73/3658.tgz.
All listings referred to in this article are available by anonymous download at ftp://ftp.ssc.com/pub/listings/issue73/3658.tgz.