qq微博 add_pic_t 带一张图的写法

$postBody       = [
                'access_token'  => $l_info['acctoken'],
                'oauth_consumer_key'    => \Yii::$app->params['qq_oauth_consumer_key'],
                'openid'        => $l_info['openid'],
                'format'        => 'json',
                'content'       => $t_info['info'],
                'clientip'      => \Yii::$app->request->getUserIP(),
                //使用 crulfile 即可
                'pic'            => new \CURLFile( realpath( $img_dir ) )   
            ];    

http://wiki.open.qq.com/wiki/website/add_pic_t