直接上程式碼

public function getAccesstoken(){
        $appid = '';                     /*小程式appid*/
        $srcret = '';      /*小程式祕鑰*/
        $tokenUrl="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$appid."&secret=".$srcret;
        $getArr=array();
        $tokenArr=json_decode($this
 
->send_post($tokenUrl,$getArr,"GET"));
        $access_token=$tokenArr->access_token;
        return $access_token;
    }
    public function send_post($url, $post_data,$method='POST') {
        $postdata = http_build_query($post_data);
        $options = array(
            'http' => array(
                
 
'method' => $method, //or GET
                'header' => 'Content-type:application/x-www-form-urlencoded',
                'content' => $postdata,
                'timeout' => 15 * 60 // 超時時間（單位:s）
            )
        );
        $context = stream_context_create($options);
        $result = file_get_contents($url, false
 
, $context);
        return $result;
    }
    public function api_notice_increment($url, $data){
        $ch = curl_init();
        $header=array('Accept-Language:zh-CN','x-appkey:114816004000028','x-apsignature:933931F9124593865313864503D477035C0F6A0C551804320036A2A1C5DF38297C9A4D30BB1714EC53214BD92112FB31B4A6FAB466EEF245710CC83D840D410A7592D262B09D0A5D0FE3A2295A81F32D4C75EBD65FA846004A42248B096EDE2FEE84EDEBEBEC321C237D99483AB51235FCB900AD501C07A9CAD2F415C36DED82','x-apversion:1.0','Content-Type:application/x-www-form-urlencoded','Accept-Charset: utf-8','Accept:application/json','X-APFormat:json');
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
        curl_setopt($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);
        //         var_dump($tmpInfo);
        //        exit;
        if (curl_errno($ch)) {
            return false;
        }else{
            // var_dump($tmpInfo);
            return $tmpInfo;
        }
    }
    /*上面生成的是數量限制10萬的二維碼，下面重寫數量不限制的碼*/
    /*getWXACodeUnlimit*/
    /*碼一，圓形的小程式二維碼，數量限制一分鐘五千條*/
    /*45009    呼叫分鐘頻率受限(目前5000次/分鐘，會調整)，如需大量小程式碼，建議預生成。
    41030    所傳page頁面不存在，或者小程式沒有釋出*/
    public function mpcode($page,$cardid){
        //引數
//        $postdata['scene']="nidaodaodao";
        $postdata['scene']=$cardid;
        // 寬度
        $postdata['width']=430;
        // 頁面
        $postdata['page']=$page;
//        $postdata['page']="pages/postcard/postcard";
        // 線條顏色
        $postdata['auto_color']=false;
        //auto_color 為 false 時生效
        $postdata['line_color']=['r'=>'0','g'=>'0','b'=>'0'];
        // 是否有底色為true時是透明的
        $postdata['is_hyaline']=true;
        $post_data = json_encode($postdata);
        $access_token=$this->getAccesstoken();
        $url="https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=".$access_token;
        $result=$this->api_notice_increment($url,$post_data);
        $data='image/png;base64,'.base64_encode($result);
        return $data;
//        echo '<img src="data:'.$data.'">';
    }
    /*碼二，正方形的二維碼，數量限制呼叫十萬條*/
    public function qrcodes($id){
        $path="pages/postcard/postcard?id=".$id;
        // 寬度
        $postdata['width']=430;
        // 頁面
        $postdata['path']=$path;
        $post_data = json_encode($postdata);
        $access_token=$this->getAccesstoken();
        $url="https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=".$access_token;
        $result=$this->api_notice_increment($url,$post_data);
        return base64_encode($result);
    }

呼叫：當增加資料時 將增加的這條資料主鍵id傳參到生成二維碼方法

    public function add($data)
    {
        $path = 'assets/qrcode/'.time().'baseCode.jpg';
        $res = $this->insertGetId(array_merge(['qrcode'=>$path],$data));
        $model = new Qrcode();
        file_put_contents($path, base64_decode($model->qrcodes($res)));
        return true;
    }