适配器模式（Adapter）

模式架构简单代码实现示例：

<?php
//对象适配器
interface Target {
    public function sampleMethod1();
    public function sampleMethod2();
}

class Adaptee {
    public function sampleMethod1() {
        echo '#######';
    }
}

class Adapter implements Target {
    private $_adaptee;
    public function __construct(Adaptee $adaptee) {
        $this->_adaptee = $adaptee;
    }

    public function sampleMethod1() {
        $this->_adaptee->sampleMethod1(); 
    }

    public function sampleMethod2() {
        echo '!!!!!!!!';
    }
}

$adapter = new Adapter(new Adaptee());
$adapter->sampleMethod1();
$adapter->sampleMethod2();
//类适配器
interface Target2 {
    public function sampleMethod1();
    public function sampleMethod2();
}

class Adaptee2 { // 源角色
    public function sampleMethod1() {}
}

class Adapter2 extends Adaptee2 implements Target2 { // 适配后角色
    public function sampleMethod2() {} 
}
$adapter = new Adapter2();
$adapter->sampleMethod1();
$adapter->sampleMethod2();