4.23 Undocumented functionsThis is NOT the latest copy of this book; click here for the latest version.
Despite the fact that the PHP documentation team works around the clock to document the language and all its functions (and do a remarkably good job!), there are still quite a few functions you will not find in the PHP manual. That is not to say they are unimportant, just that either very few people know how to use them, or that no one has had enough time to get around to them yet.
Although I have covered several of these functions in this book, there are probably many dozen more still around. A list of all the undocumented functions is available at http://zend.com/phpfunc/nodoku.php , but that was quite out of date last time I checked. Sometimes the only way to be certain is to look up the source code yourself.
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