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One of the most commonly used tools of a programmer is a pointer, this particular tool isn't as common in scripting languages like php as it is in application programming but can come in useful now and again. As you may or may not know php was actually written in the C language and as such inherited alot of its functionality.
After some research i found a number of different methods which use similar methods or ideas. First up is the callback function which is essentially a pointer to a function here is an example of its use:
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