php设计模式--门面模式

class ali 
{
    function buy(){
        echo "买入阿里<br/>";
    }

    function sell(){
        echo "卖出阿里<br>";
    }
}

class hds 
{
    function buy(){
        echo "买入x德森<br/>";
    }

    function sell(){
        echo "卖出汉xx<br>";
    }
}

class hfjy 
{
    function buy(){
        echo "买入xxx<br/>";
    }

    function sell(){
        echo "卖出xx教育<br>";
    }
}

class menmian
{

    private $ali;
    private $hfjy;
    private $hds;

    function __construct(){
        $this->ali = new ali();
        $this->hds = new hds();
        $this->hfjy = new hfjy();
    }
    public  function buy(){
        $this->ali->buy();
    }
    public  function sell(){
        $this->hfjy->sell();
        $this->hds->sell();
    }
}

$res = new menmian();
$res->buy();
echo "<hr>";
$res->sell();