The decorative mode of PHP design pattern

Here is a simple class to help understand the decorative pattern, hope to be helpful to everyone, some places to change to Chinese, easy to understand.

I have to eat at a restaurant, and the result of the program is to print a description of what I eat and to calculate the price.

Such a layer of bag down, such as large pockets, small pockets, is the so-called decorative mode.

Base class
Class Food {
var $des = ' food ';
var $cost;
function Getdes () {
return $this->des;
}
function Getcost () {
return $this->cost;
}
}
Decorated Person class
Class Rice extends Food {
var $des = "Rice";
var $cost = 0.44;
}
The adorner class inherits from the same base class as the decorated person
Class Dish extends Food {
var $obj;
var $des = ';
var $cost;
}
A subdivision of a decorated person
Class fried potato silk extends dish {
var $obj;
var $des = ' potato silk ';
var $cost = 0.10;
function __construct ($obj) {
$this->obj= $obj;
}
function Getdes () {
return $this->obj->getdes (). $this->des;
}
function Getcost () {
return $this->obj->getcost () + $this->cost;
}
}
There is a subdivision of the decorator who
Class Pickles extends Vegetables {
var $obj;
var $des = ' Pickles ';
var $cost = 0.10;
function __construct ($obj) {
$this->obj= $obj;
}
function Getdes () {
return $this->obj->getdes (). $this->des;
}
function Getcost () {
return $this->obj->getcost () + $this->cost;
}
}
More dishes
......
Test code
$ lunch = new Rice ();
$ Lunch =new Potato thread ($ lunch);
$ Lunch =new Pickles ($ lunch);
echo $ lunch->getdes ();//outputs rice, potato shreds, pickles.
echo $ lunch->getcost ();//outputs 0.64