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  Tutorial: PHP Introduction to PHP Introduction to PHP Functions Tutorial

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.

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PHP Functions

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.

you're 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.

In the case of explode:
array explode ( string separator, string string [, int limit])
This line is known as the prototype. It tells you exactly what the function is and what parameters it should be passed. We can see that it will return an array when you call it, and as parameters (the name of a variable usually passed to a function e.g $split and $string are the parameters in explode($split, $string)), it takes separator, string and limit. Parameters are always within the ( ). The first 2:
( string separator, string string [, int limit])
are required and you must pass arguments (the actual value of the parameter e.g ' ' and 'split this up' are the arguments in explode(' ', 'split this up')) for these when you call the function. If you do not specify a separator or a string, you will get an error. The parameters must also be passed in the order they are listed here. You cannot swap them around.


 

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