PHP怎么实现一个二维码生成类

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where(array('id'=> $wechatid))->find();    $appid = $wechat['appid'];    $secret = $wechat['secret'];    $ACCESS_TOKEN = $this->getToken($appid,$secret);    $url = $this->getQrcodeurl($ACCESS_TOKEN,$fqid,1);    return DownLoadQr($url,time());  }  protected function getQrcodeurl($ACCESS_TOKEN,$fqid,$type = 1){    $url = self::$qrcode_url.'access_token='.$ACCESS_TOKEN;    if($type == 1){      //生成永久二维码      $qrcode= '{"action_name": "QR_LIMIT_SCENE", "action_info": {"scene": {"scene_id": '.$fqid.'}}}';    }else{      //生成临时二维码      $qrcode = '{"expire_seconds": 1800, "action_name": "QR_SCENE", "action_info": {"scene": {"scene_id": '.$fqid.'}}}';    }    $result = $this->http_post_data($url,$qrcode);    $oo = json_decode($result[1]);    if(!$oo->ticket){      $this->ErrorLogger('getQrcodeurl falied. Error Info: getQrcodeurl get failed');      exit();    }    $url = self::$qrcode_get_url.'ticket='.$oo->ticket.'';    return $url;  }  protected function getToken($appid,$secret){    $ACCESS_TOKEN = file_get_contents(self::$token_url."appid=$appid&secret=$secret");    $ACCESS_TOKEN = json_decode($ACCESS_TOKEN);    $ACCESS_TOKEN = $ACCESS_TOKEN->access_token;    return $ACCESS_TOKEN;  }  protected function http_post_data($url, $data_string) {    $ch = curl_init();    curl_setopt($ch, CURLOPT_POST, 1);    curl_setopt($ch, CURLOPT_URL, $url);    curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);    curl_setopt($ch, CURLOPT_HTTPHEADER, array(        'Content-Type: application/json; charset=utf-8',        'Content-Length: ' . strlen($data_string))    );    ob_start();    curl_exec($ch);    if (curl_errno($ch)) {      $this->ErrorLogger('curl falied. Error Info: '.curl_error($ch));    }    $return_content = ob_get_contents();    ob_end_clean();    $return_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);    return array($return_code, $return_content);  }  //下载二维码到服务器  protected function DownLoadQr($url,$filestring){    if($url == ""){      return false;    }    $filename = $filestring.'.jpg';    ob_start();    readfile($url);    $img=ob_get_contents();    ob_end_clean();    $size=strlen($img);    $fp2=fopen('./Uploads/qrcode/'.$filename,"a");    if(fwrite($fp2,$img) === false){      $this->ErrorLogger('dolwload image falied. Error Info: 无法写入图片');      exit();    }    fclose($fp2);    return './Uploads/qrcode/'.$filename;  }  private function ErrorLogger($errMsg){    $logger = fopen('./ErrorLog.txt', 'a+');    fwrite($logger, date('Y-m-d H:i:s')." Error Info : ".$errMsg."\r\n");  }}

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