php设计模式学习之观察者模式

interface userOperateImpl
{
    public function operate($username);
}

class userLoginLog implements userOperateImpl
{
    public function operate($username)
    {
        echo ‘用户名为 [‘.$username.‘] 的用户登陆记录日志<br/>‘;
    }
}

class UserLoginPush implements userOperateImpl
{
    public function operate($username)
    {
        echo ‘用户名为 [‘.$username.‘] 的用户登陆推送消息<br/>‘;
    }
}

class UserLogin
{
    private $_obj = array();
    public $username;

    public function __construct($username,$_objArr = array())
    {
        $this->username = $username;
        $this->_obj = $_objArr;
    }

    public function userLogin()
    {
        echo "用户名为 [".$this->username."] 的用户登陆!<br/>";
        $this->trigger();
    }

    private function trigger()
    {
        if(!empty($this->_obj)){
            foreach($this->_obj as $obj){
                /** @var userOperateImpl $obj */
                $obj->operate($this->username);
            }
        }
    }
}

$user = new UserLogin(‘Mr Li‘, array(
        new userLoginLog(),
        new UserLoginPush()
    )
);
$user->userLogin();