Last time I spoke about functions, and while there is still a fair bit to say on the matter, I’m going to move forward a little and talk about OOP, as it’s a fairly important part of programming, especially in PHP 5 onwards. It stands for ‘Object Oriented Programming‘, and is the basis of PHP frameworks such as the Zend Framework.

OOP revolves around classes, objects and methods. A class is a set of program statements that perform a specific tasks, and generally feature both variables and functions. Objects are the specific instances in which classes appear. A method is a predefined function of the object. Once the class has been defined, we can bring it in as much as we like, and each time we bring it in, it is a separate object, and can be affected independently of other objects.

The key point behind object orientated programming is that it is easily updatable and editable. To see OOP in action, see the following example:

<?php

// now we define the methods
public function sleep() {
echo $this->name." is sleeping<br />";
}
public function work() {
echo $this->name." is at work<br />";
}
public function home() {
echo $this->name." is at home<br />";
}
}

Now we can use this class as a template and apply individual characteristics to each object:

<?php

$homer->work();
$homer->sleep();
$marge->home();
$bart->home();
$bart->sleep();

You will notice that there are a few functions that don’t come into play. I will use this same code next time and go over some more things that can be done with object orientating programming.

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