Forum Moderators: coopster
One of the best places to start is right here:
[webmasterworld.com...] ;)
You should also check out the PHP forum library [webmasterworld.com], in particular PHP Bag of Tricks part 1 [webmasterworld.com] and part 2 [webmasterworld.com].
Also very helpful is the PHP main site [php.net] - you can search for examples of each function, and there is a comprehensive description followed by user comments and examples.