PHP获取微信二维码

 function wx_code(){

     header('content-type:text/html;charset=utf-8');

        //配置APPID、APPSECRET

        $APPID = "*******";

        $APPSECRET =  "********";

        //获取access_token

        $access_token = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$APPID&secret=$APPSECRET";

        $ACCESS_TOKEN = "";

        //tp3.2 获取缓存

         $value = S('access_token');

         if($value){

            $ACCESS_TOKEN =  $value;

         }else{

             $json = $this->httpCurl( $access_token );

             $json = json_decode($json,true);

            //tp3.2 保存缓存

             S('access_token',$json['access_token'],18000);

             $ACCESS_TOKEN = $json["access_token"];

        }

        //构建请求二维码参数

        //path是扫描二维码跳转的小程序路径，可以带参数?id=$id

        //width是二维码宽度

        $url = get_host_name().$_SERVER['REQUEST_URI'];

        $qcode ="https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=$ACCESS_TOKEN";

        $param = json_encode(array("path"=>"/pages/index/index?url=".$url,"width"=> 150));

        //POST参数

        $result = $this->httpCurl( $qcode, $param,"POST");

        //生成二维码

        // file_put_contents("qrcode.png", $result);

        $base64_image ="data:image/jpeg;base64,".base64_encode( $result );

    }

    //把请求发送到微信服务器换取二维码

  function httpCurl($url, $data='', $method='GET'){

    $curl = curl_init();

    curl_setopt($curl, CURLOPT_URL, $url);

    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);

    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);

    curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);

    curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);

    curl_setopt($curl, CURLOPT_AUTOREFERER, 1);

    if($method=='POST'){

        curl_setopt($curl, CURLOPT_POST, 1);

        if ($data != ''){

            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);

        }

    }

    curl_setopt($curl, CURLOPT_TIMEOUT, 30);

    curl_setopt($curl, CURLOPT_HEADER, 0);

    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

    $result = curl_exec($curl);

    curl_close($curl);

    return $result;

  }