外观模式（Facade）

模式架构简单代码实现示例：

<?php
class Camera {
    public function turnOn() {}
    public function turnOff() {}
    public function rotate($degrees) {}
}

class Light {
    public function turnOn() {}
    public function turnOff() {}
    public function changeBulb() {}
}

class Sensor {
    public function activate() {}
    public function deactivate() {}
    public function trigger() {}
}

class Alarm {
    public function activate() {}
    public function deactivate() {}
    public function ring() {}
    public function stopRing() {}
}

class SecurityFacade {
    private $_camera1, $_camera2;
    private $_light1, $_light2, $_light3;
    private $_sensor;
    private $_alarm;

    public function __construct() {
        $this->_camera1 = new Camera();
        $this->_camera2 = new Camera();

        $this->_light1 = new Light();
        $this->_light2 = new Light();
        $this->_light3 = new Light();

        $this->_sensor = new Sensor();
        $this->_alarm = new Alarm();
    }

    public function activate() {
        $this->_camera1->turnOn();
        $this->_camera2->turnOn();

        $this->_light1->turnOn();
        $this->_light2->turnOn();
        $this->_light3->turnOn();

        $this->_sensor->activate();
        $this->_alarm->activate();
    }

    public  function deactivate() {
        $this->_camera1->turnOff();
        $this->_camera2->turnOff();

        $this->_light1->turnOff();
        $this->_light2->turnOff();
        $this->_light3->turnOff();

        $this->_sensor->deactivate();
        $this->_alarm->deactivate();
    }
}


//client 
$security = new SecurityFacade();
$security->activate();
<?php
class Camera {
    public function turnOn() {}
    public function turnOff() {}
    public function rotate($degrees) {}
}

class Light {
    public function turnOn() {}
    public function turnOff() {}
    public function changeBulb() {}
}

class Sensor {
    public function activate() {}
    public function deactivate() {}
    public function trigger() {}
}

class Alarm {
    public function activate() {}
    public function deactivate() {}
    public function ring() {}
    public function stopRing() {}
}

class SecurityFacade {
    private $_camera1, $_camera2;
    private $_light1, $_light2, $_light3;
    private $_sensor;
    private $_alarm;

    public function __construct() {
        $this->_camera1 = new Camera();
        $this->_camera2 = new Camera();

        $this->_light1 = new Light();
        $this->_light2 = new Light();
        $this->_light3 = new Light();

        $this->_sensor = new Sensor();
        $this->_alarm = new Alarm();
    }

    public function activate() {
        $this->_camera1->turnOn();
        $this->_camera2->turnOn();

        $this->_light1->turnOn();
        $this->_light2->turnOn();
        $this->_light3->turnOn();

        $this->_sensor->activate();
        $this->_alarm->activate();
    }

    public  function deactivate() {
        $this->_camera1->turnOff();
        $this->_camera2->turnOff();

        $this->_light1->turnOff();
        $this->_light2->turnOff();
        $this->_light3->turnOff();

        $this->_sensor->deactivate();
        $this->_alarm->deactivate();
    }
}


//client 
$security = new SecurityFacade();
$security->activate();