4.24 SummaryThis is NOT the latest copy of this book; click here for the latest version.
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Functions provide the core of PHP's programming functionality, and there are hundreds to choose from.
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However, the chances are you are only going to use about twenty or so in common practice, so do not waste time trying to learn them all - that is what the manual is there for!
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Writing your own functions eliminates code duplication, thereby reducing the likelihood of bugs, and making it easier for you to make changes to the code.
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Passing by and returning by reference can often make your script run faster, however it is important to note that objects are inherently passed by reference.
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PHP's string manipulation functions are very powerful and very flexible, although it is worth your while always trying to use the least complicated function suitable for your purpose - do not bother with regexps when a simpler function will do.
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Recursive functions are useful for a wide variety of tasks, whether it be printing a threaded messageboard index or path-finding in a game.
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