PHP下载微信头像

public function downloadPic($openid='',$headimgurl='')
    {
       $header = array(
       'User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0',
       'Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
       'Accept-Encoding: gzip, deflate',);
       $url=$headimgurl;
       $curl = curl_init();

       curl_setopt($curl, CURLOPT_URL, $url);
       curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
       curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
       curl_setopt($curl, CURLOPT_ENCODING, 'gzip');
       curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
       $data = curl_exec($curl);
       $code = curl_getinfo($curl, CURLINFO_HTTP_CODE);

       curl_close($curl);
       if ($code == 200) {//把URL格式的图片转成base64_encode格式的！
          $imgBase64Code = "data:image/jpeg;base64," . base64_encode($data);
       }
       $img_content=$imgBase64Code;//图片内容
       // echo $img_content;exit;
       if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $img_content, $result))
       {
           $type = $result[2];//得到图片类型png?jpg?gif?
           // dump($result);exit;

           $new_file = ROOT_PATH . 'public' . DS . 'uploads/'.$openid.'.'.$type;//存储目录
           if (file_put_contents($new_file, base64_decode(str_replace($result[1], '', $img_content))))
           {
                $pic = $openid.'.'.$type;
                return $pic;
           }
       }

    }