The best online programming documentation I have ever seen is published by the PHP developers at PHP.Net. Each page documenting a language feature includes a message board where programmers can offer tips, advice, and workarounds (example: the file() function page).

Also, if you type a URL that doesn't exist on the site, such as, a search is launched using the path of the URL as the search term.

As a PHP developer, I love this site. As a computer book author, I'm glad this level of free online support isn't common.

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