生成二维码

<?php

/**

 * @Author   焦

 * @DateTime 2020-08-19

 */


namespace HomeController;

use ThinkController;


class QrcodeController extends Controller {

    //生成二维码
    public function my_ewm()
    {

        $appid = '';
        $appsecret = '';//appid对应的appsecret
        header('content-type:text/html; charset=utf-8');
        //$_POST=$_REQUEST;
        $openid =$_POST['openid'];
        $user = M("user")->where(["openid" => $openid])->find();
        if (!$openid) {
            $data = array("result" => '2', "message" => "参数有误!"); //组装JSON
            echo json_encode($data); //返回
            die;
        }
        $goodsid = $user['id'];
        if (!$goodsid) {
            echo "空的id！";
            die;
        }
        $filename = $goodsid . '.jpg';
        $file = './Public/qrcode/' . $filename;
        $scene = "?scene=" . $goodsid;
        if (file_exists($file)) {
            $arr="http://yuqiangkt.com/Public/qrcode/" . $filename . "" . $scene;
            $data = array("result" => '1', "message" => "成功", "list" => $arr); //组装JSON
            echo json_encode($data); //返回
            die;
//            echo "<script>location.href='http://zgmm.a40.com.cn/Public/qrcode/" . $filename . "" . $scene . "'</script>";
        } else {
            //请求accesstoken接口
            $url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=' . $appid . '&secret=' . $appsecret;
            $https = true;
            $method = 'get';
            $data = null;
            //get curl传值
            $str = $this->get_curl($url, $data, $method);
            //获取请求到的结果讲上面获取的accresstoken进行解码成数组，然后获取accesstoken值
            $arr = json_decode($str, true);
            // dump($arr);die;
            $access_token = $arr['access_token'];
            //获取二维码，但是切记这里accesstoken不能用通过post传值，只能用get传值
            $width = 430;
            $url = 'https://api.weixin.qq.com/wxa/getwxacode?access_token=' . $access_token;
            //$data['scene']=$goodsid;//"t_id=".$userinfo['id'];
            //$data['path']='pages/home/homedetail';
            //$data['width']=$width;
            $data['path'] = 'pages/saoma/saoma?id=' . $goodsid;
            $data['width'] = $width;
            $post_data = json_encode($data);
            $https = true;
            $method = 'post';
            //post curl传值
            $str = $this->get_curl($url, $post_data, $method);
            //进行保存
            $res = file_put_contents($file, $str);
            //如果保存成功返回路径
            if ($res != 0) {
                $arr="http://yuqiangkt.com/Public/qrcode/" . $filename . "" . $scene;
                $data = array("result" => '1', "message" => "成功", "list" => $arr); //组装JSON
                echo json_encode($data); //返回
                die;

            } else {
                echo "生成小程序码出错！";
            }
        }

    }
    public function get_curl($url, $data = null, $headers = array())
    {
        $curl = curl_init();
        if (count($headers) >= 1) {
            curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
        }
        curl_setopt($curl, CURLOPT_URL, $url);

        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);

        if (!empty($data)) {
            curl_setopt($curl, CURLOPT_POST, 1);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        }
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($curl);
        curl_close($curl);
        return $output;
    }
}