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Detailed explanation of the decorator pattern of PHP design patterns
Detailed explanation of the decorator pattern of PHP design patterns
Decorator model can dynamically add and modify the function of a class. Each class provides a function. If you want to modify and add additional functions, traditional programming It is to write a subclass to inherit it and reimplement the class method, using the decorator pattern, and only need to add a decorator## at runtime. #Object can be implemented to achieve maximum flexibility
<?php
/*
* 装饰模式
*/
abstract class Beverage
{
public $_name;
abstract public function Cost();
}
// 被装饰者类
class Coffee extends Beverage
{
public function construct()
{
$this->_name = 'Coffee';
}
public function Cost()
{
return 1.00;
}
}
// 以下三个类是装饰者相关类
class CondimentDecorator extends Beverage //装饰类
{
public function construct()
{
$this->_name = 'Condiment';
}
public function Cost()
{
return 0.1;
}
}
class Milk extends CondimentDecorator //牛奶 配料 --装饰者
{
public $_beverage;
public function construct($beverage)
{
if ($beverage instanceof Beverage) {
$this->_beverage = $beverage;
} else
exit('Failure');
}
public function Cost()
{
return $this->_beverage->Cost() + 0.2;
}
}
class Sugar extends CondimentDecorator //糖 配料 --装饰者
{
public $_beverage;
public function construct($beverage)
{
$this->_name = 'Sugar';
if ($beverage instanceof Beverage) {
$this->_beverage = $beverage;
} else {
exit('Failure');
}
}
public function Cost()
{
return $this->_beverage->Cost() + 0.2;
}
}
// Test Case
//1.拿杯咖啡
$coffee = new Coffee();
//2.加点牛奶
$coffee = new Milk($coffee);
//3.加点糖
$coffee = new Sugar($coffee);
echo $coffee->Cost();
echo $coffee->_name;Related recommendations:
Detailed sample code for PHP decoration mode
Easy to understand PHP Design pattern singleton pattern
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