大话设计模式第十二章---外观模式PHP实现

<?php
class Sub_system_one {
    public function method_one() {
        echo "subsystem one method one<br/>";
    }
}
class Sub_system_two {
    public function method_two() {
        echo "subsystem one method two<br/>";
    }
}
class Sub_system_three {
    public function method_three() {
        echo "subsystem one method three<br/>";
    }
}
class Sub_system_four {
    public function method_four() {
        echo "subsystem one method four<br/>";
    }
}

class Facade {
    private $_one;
    private $_two;
    private $_three;
    private $_four;

    public function __construct() {
        $this->_one   = new Sub_system_one();
        $this->_two   = new Sub_system_two();
        $this->_three = new Sub_system_three();
        $this->_four  = new Sub_system_four();
    }

    public function method_A() {
        echo "method group A<br/>";
        $this->_one->method_one();
        $this->_two->method_two();
        $this->_four->method_four();
    }
    public function method_B() {
        echo "method group B<br/>";
        $this->_two->method_two();
        $this->_three->method_three();
    }
}


$facade = new Facade();
$facade->method_A();
$facade->method_B();