目的
抽象部分和实现部分分离，各自独立的变化。
优点
- 分离接口及其实现部分
- 提高可扩充性
- 实现细节对客户端透明
实现
abstract class Abstration{
protected $imp;
public function operation(){
$this->imp->operationImp();
}
}
class RefinedAbstration extends Abstration{
function __construct(Implementor $imp){
$this->imp = $imp;
}
}
abstract class Implementor {
public function operationImp(){
}
}
class ConcreteImplementorA extends Implementor{
public function operationImp(){
echo "ConcreteImplementorA operation!!!";
}
}
class ConcreteImplementorB extends Implementor{
public function operationImp(){
echo "ConcreteImplementorB operation!!!";
}
}
//测试代码
$impA = new ConcreteImplementorA();
$impB = new ConcreteImplementorB();
$clientA = new RefinedAbstration($impA);
$clientB = new RefinedAbstration($impB);
$clientA->operation();
$clientB->operation();
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