public function send_msg($user_id){  //傳送小程式模板訊息
    $appid  = 'wx6de91caa27fe';
    $secret = '35603e3370c8f2e3cb1bb8884d';
    $user_info = M('users')->field('openid,form_id')->where(['user_id'=>$user_id])->find();   //form_id 由小程式前端提供
    $ACCESS_TOKEN = $this->get_ACCESS_TOKEN($appid,$secret);
    $url = "https://api.weixin.qq.com/cgi-bin/message/wxopen/template/send?access_token=$ACCESS_TOKEN";  

    $data=array('touser'=>$user_info['openid'],   //發給誰
                'template_id'=>'vFo4Nx-exsziMg09stAVTnfuArFK-ZvN-AFlmn9Fj6s',   //訂單發貨提醒
                 'page'=> 'pages/index/index',
                'form_id'=>$user_info['form_id'], 
                'data'=>array(
                    'keyword1'=>array(
                        'value'=>'12341234',    // 訂單號
                        'color'=>'#173177'
                    ),
                    'keyword2'=>array(
                        'value'=>'12點30分',  //發貨時間
                        'color'=>'#173177'
                    ),
                    'keyword3'=>array(
                        'value'=>'口紅',  //產品名
                        'color'=>'#173177'
                    ),
                    'keyword4'=>array(
                        'value'=>'11111111111',
                        'color'=>'#173177'
                    )
                )
    );
    $data = json_encode($data);
    $ch = curl_init();         
    curl_setopt($ch, CURLOPT_URL, "https://api.weixin.qq.com/cgi-bin/message/wxopen/template/send?access_token=".$ACCESS_TOKEN);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $tmpInfo = curl_exec($ch);
    if (curl_errno($ch)) {
        return curl_error($ch);
    }
    curl_close($ch);
    print_r($tmpInfo);

    }
 

public function get_ACCESS_TOKEN(appid,$appid,$secret) //獲取token
{

    $data = json_decode(file_get_contents("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$appid&secret=$secret")) ;
    return $data->access_token;
}