设计模式PHP篇（三）————装饰器模式

简单的用php实现了装饰器模式：

<?php

/**
*简单的装饰器模式
*/
class PrintText
{
	protected $decorators = [];

	public function print()
	{
		$this->before();
		echo "hello world" . PHP_EOL;
		$this->after();
	}

	public function addDecorators(Decorator $decorator)
	{	
		$this->decorators[] = $decorator;

	}

	protected function before()
	{
		foreach ($this->decorators as $key => $value) {
			$value->before();
		}
	}

	//使用栈的方式，先进后出
	protected function after()
	{
		 $decorators = array_reverse($this->decorators);
		foreach($decorators as $key => $value){
			$value->after();
		}
	}

}

interface Decorator
{

	public function before();
	public function after();

}

class Font implements Decorator
{
	public function before()
	{
		echo "fonts before" . PHP_EOL;
	}

	public function after()
	{
		echo "fonts after" . PHP_EOL;
	}
}

class Color implements Decorator
{
	public function before()
	{
		echo "color before" . PHP_EOL;
	}

	public function after()
	{
		echo "color after" . PHP_EOL;
	}
}

$print = new PrintText();
$print->addDecorators(new Font());
$print->addDecorators(new Color());

$print->print();


//output results
/**
fonts before
color before
hello world
color after
fonts after
*/

代码比较简单，如果有什么问题，还请不吝赐教。