微信小程序实现生成二维码图片进行页面跳转页面并将图片保存到本地

直接上代码

public function getAccesstoken(){
        $appid = '';                     /*小程序appid*/
        $srcret = '';      /*小程序秘钥*/
        $tokenUrl="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$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 // 超时时间（单位: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 $tmpInfo;
        }
    }
    /*上面生成的是数量限制10万的二维码，下面重写数量不限制的码*/
    /*getWXACodeUnlimit*/
    /*码一，圆形的小程序二维码，数量限制一分钟五千条*/
    /*45009    调用分钟频率受限(目前5000次/分钟，会调整)，如需大量小程序码，建议预生成。
    41030    所传page页面不存在，或者小程序没有发布*/
    public function mpcode($page,$cardid){
        //参数
//        $postdata['scene']="nidaodaodao";
        $postdata['scene']=$cardid;
        // 宽度
        $postdata['width']=430;
        // 页面
        $postdata['page']=$page;
//        $postdata['page']="pages/postcard/postcard";
        // 线条颜色
        $postdata['auto_color']=false;
        //auto_color 为 false 时生效
        $postdata['line_color']=['r'=>'0','g'=>'0','b'=>'0'];
        // 是否有底色为true时是透明的
        $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.'">';
    }
    /*码二，正方形的二维码，数量限制调用十万条*/
    public function qrcodes($id){
        $path="pages/postcard/postcard?id=".$id;
        // 宽度
        $postdata['width']=430;
        // 页面
        $postdata['path']=$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);
    }

调用：当增加数据时 将增加的这条数据主键id传参到生成二维码方法

    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;
    }