PHP结构型模式之外观模式

<?php
// 子系统A
class SubSystemA
{
    public function operationA()
    {
        echo "SubSystemA operation.\n";
    }
}
// 子系统B
class SubSystemB
{
    public function operationB()
    {
        echo "SubSystemB operation.\n";
    }
}
// 子系统C
class SubSystemC
{
    public function operationC()
    {
        echo "SubSystemC operation.\n";
    }
}
// 外观类
class Facade
{
    private $subSystemA;
    private $subSystemB;
    private $subSystemC;
    public function __construct()
    {
        $this->subSystemA = new SubSystemA();
        $this->subSystemB = new SubSystemB();
        $this->subSystemC = new SubSystemC();
    }
    public function operation()
    {
        $this->subSystemA->operationA();
        $this->subSystemB->operationB();
        $this->subSystemC->operationC();
    }
}
// 客户端代码
$facade = new Facade();
$facade->operation();

<?php
$facade = new Facade();
$facade->operation();