微信公众号群发接口

//群发消息接口
    public function sendMessage(){
        $access_token = $this->getWxAccessToken();             //1、获取access_token
        $url = 'https://api.weixin.qq.com/cgi-bin/message/mass/preview?access_token='.$access_token; 
       /*{ "touser":"OPENID", "text":{ "content":"CONTENT" }, "msgtype":"text" } { "touser":"OPENID", "mpnews":{ "media_id":"123dsdajkasd231jhksad" }, "msgtype":"mpnews" } */
       $arr = array(
            'touser'=>'oBdTesvQ3Q7m_fKQe1312312313',
            'text'=>array('content'=>urlencode('hello,这个是群发测试！')),
            'msgtype'=>'text'
        );                                                     //2、准备数据
       /*$arr2 = array( 'touser'=>'oBdTesvQ3Q7m_fKQejI6XQ9XCk2o', 'mpnews'=>array('media_id'=>'123dsdajkasd231jhksad'), 'msgtype'=>'mpnews' );*/
        $postJson = urldecode(json_encode($arr));              //3、转成json数据
        $res = $this->http_curl($url,'post','json',$postJson); //4、调用发送数据，打印返回结果
        var_dump($res); 
    }

备注： 微信开发文档 https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1481187827_i0l21