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An introduction to using existing and creating your own functions in PHP. Does not require link back.

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Functions are a very important part of PHP and it is probably safe to say that they are used in every single script. This tutorial will guide you through the basics of PHP functions to creating your own to do specific tasks.

Functions: An Introduction
You have already used many functions with PHP. Every time you do:

explode( , $value1);
?>

youre using a function. These are known as built in PHP functions because they are the same and are available on every PHP setup. You can access them in any script without needing to do anything special.

A function can be classed as a subprogram that can act on data and return a value. Each function has its own name and when that name is encountered, the execution of the programme branches off to the first line (or statement) of that function. When the function has completed, it returns and execution resumes from where it left off. A function will perform a specific task and do it well, returning the value you want with the arguments you pass to it.

When you lookup a function on the PHP website e.g explode(), you will see the description of the function, and what it does first. The description then explains how to use the function.

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