public function getApp()
	{
		if(! self::$_app instanceof Application){
			self::$_app = new Application(Yii::$app->params['WECHAT']);
		}
		return self::$_app;
	}
public function getApp()
	{
		if(! self::$_app instanceof Application){
			self::$_app = new Application(Yii::$app->params['WECHAT']);
		}
		return self::$_app;
	}
public function getApp ( ) { if ( ! self :: $ _app instanceof Application ) { self :: $ _app = new Application ( Yii :: $ app -> params [ 'WECHAT' ] ) ; } return self :: $ _app ; }
single instance of EasyWeChat\Foundation\Application
@return Application
single instance of EasyWeChat \ Foundation \ Application