装饰器模式

来源：互联网发布：中标数据查询编辑：程序博客网时间：2024/06/01 16:33

定义：装饰器模式可以动态的添加修改类的功能

初始的一个类，无任何修饰，只简单的输出helloworld

<?class HelloWorld  {    protected $output="HelloWorld";    public function output()   {        echo $this->output;   }}$hw=new HelloWorld();$hw->output();

现在运用装饰期模式来给来给该类的输出增加颜色，代码如下

<?php/** *  * @authors mtg * @date    2015-08-31 09:45:01 *//*此处的作用是 *定义一个装饰器接口 */interface Decorator{     function before_method();     function after_method();     }   /*此处的作用是    *定义一个颜色装饰器    */class ColorDecorator implements Decorator{ protected $color; function __construct($value='') {    $this->color=$value; } public function before_method() {    echo "<div style='color:".$this->color."'>"; }  public function after_method() {  echo "</div>"; }}class HelloWorld  {    protected $decorator=array();    protected $output="HelloWorld";   public function addDecorator(Decorator $decorator)   {    $this->decorator[]=$decorator;   }   public function output()   {    $this->before_op();    echo $this->output;    $this->after_op();   }   public function before_op(){    if (!empty($this->decorator)) {    foreach ($this->decorator as $key => $value) {        $value->before_method();    }   }   }   public function after_op()   {     /*此处的作用是     *需要将装饰器倒序后再调用方法     */    if (!empty($this->decorator)) {    $this->decorator=array_reverse($this->decorator);    foreach ($this->decorator as $key => $value) {        $value->after_method();    }    }   }}$hw=new HelloWorld();$hw->output();$colordecorator=new ColorDecorator('red');$hw->addDecorator($colordecorator);$hw->output();

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