From www.phpe.com
(1) PHP official manual in PHP5 related sections:
http://www.php.net/manual/en/language.oop5.php
http://www.php.net/manual/en/migration5.oop.php
Authoritative information, but unfortunately there are many chapters to be blank.
(2) Zend.com PHP5 Information Center
http://www.zend.com/php5/
PHP5's big camp, rich information, timely update.
(3) PHP5 Forum:
1) SitePoint PHP Advanced Programming Area
http://www.sitepoint.com/forums/forumdisplay.php?f=147
2) Zend.com PHP5 Forum
http://www.zend.com/phorum/list.php?num=6
The two popularities are not bad and there is no one (including some PHP core developers) forum. If you encounter questions on PHP5, you can find the answer here.
(4) Other related sites:
1) PHP5 Wiki
http://www.wiki.cc/php/php5
2) phpvolcano.com
http://www.phpvolcano.com/articles/php5/index.php
Chinese resources
1) phpe.net
http://www.phpe.net
Domestic PHP resources are the most abundant site, will launch some php5 articles from time to time.
2) phpmore.com
http://www.phpmore.com
Domestic first PHP Electronic Magazine (PDF), providing the latest PHP information, monthly basis. Will launch a PHP5 related technical articles.
3) Haohappy's blog [php5 exploration topic] (I am sorry to sell melon this king)
http://blog.9cbs.net/haohappy2004/category/32459.aspx
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