Classes are data containers which store functions (called methods) and variables (called properties).

Classes are defined with the class declaration:

Class Declaration

<?php 
class Simple {
}
?>
Properties are defined with the var declaration:

Property Declaration

<?php
class Simple {
    var $someprop;
}
?>
Methods are defined with the function declaration:

Method Declaration

<?php
class Simple {
    var $someprop;

    function somemethod ()
    {
        print ('HALLO!');
    }
}
?>
In order access class properties and methods, you can use the default $this object, which is created alongside every object instance.

$this

<?php
class Simple {
    var $someprop;

    function somemethod ()
    {
        $this->someprop = 'Irgendwie neeee?';

        print ('Ja, das ist doch ' . $this->someprop);
    }

    function anothermethod ()
    {
        $this->somemethod ();
    }
}
?>
Constructors are methods that have the same name as the class:

Constructors

<?php
class Simple {
    var $someprop;

    function Simple () 
    {
        $this->someprop = get_defined_functions ();
    }

    function somemethod ()
    {
        $this->someprop = 'Irgendwie neeee?';

        print ('Ja, das ist doch ' . $this->someprop);
    }

    function anothermethod ()
    {
        $this->somemethod ();
    }
}
?>