You can learn more about from PHP from lot of resources on the web. There are mailing lists available for support. Some books are also available.
The exploding popularity of PHP has resulted in lot of www sites. Many of them have on-line tutorials, sample code, tips and tricks etc.
You can register to these lists from the Support section of the PHP site. Please note that these are high volume lists, typically having 100 mails per day.
So far, I know of two books, both of which are available from Amazon.com. I have not read any of these books, and I think the on-line manual is more than sufficient. Still, if you like reading books :
Several full-fledged projects are already available in PHP. Some of the more interesting ones are :
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