[PHP知识库]PHP 获取微信小程序二维码

• 第一步：获取 access_token

   	/**
    * 获取AccessToken
    * @return string
    */
   public function getAccessToken(){

       $appId = env('WX_APP_ID');
       $secretKey = env('WX_SECRET');

       $url = "https://api.weixin.qq.com/cgi-bin/token";
       $params = [
           'grant_type' => "client_credential",
           'appid' => $appId,
           'secret' => $secretKey
       ];
       $res = $this->request($url,$params,false);

       return $res->access_token;
   }

• 第二步：调用接口生成微信二维码(这里以接口B为例)

   public function getCode($token,$sale_id)
   {
       $url = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token={$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=xxx
       //width是二维码宽度

       $param = json_encode(array("scene"=>$sale_id,"width"=> 80));

       $contents = $this->httpRequest( $url, $param,"POST");

       $result=$this->data_uri($contents,'image/png');

       return '<image src='.$result.'></image>';
   }
   //二进制转图片image/png
   public function data_uri($contents, $mime)
   {
       $base64   = base64_encode($contents);
       return ('data:' . $mime . ';base64,' . $base64);
   }
   
   public function httpRequest($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_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;
   }