php获取远程图片base64转码

<?php
  //上传图片接口
     public function upload(){
         $token = '1613533445ca5dbeebca668abbeb58ac';
         
         $file = "https://image.jewelryhunt.net/zhaowu/20220112/21041ac8a6829bb8d24212bae728bfe7.jpg";        $url = 'http://api.kingdee.com/jdy/basedata/image_upload?access_token='.$token;
         $type = getimagesize($file);//取得图片的大小，类型等
         $content = file_get_contents($file);
         $file_content = chunk_split(base64_encode($content));//base64编码
         
         switch($type[2]){//判读图片类型
             case 1:$img_type="gif";break;
             case 2:$img_type="jpg";break;
             case 3:$img_type="png";break;
         }
         $b64 = 'data:image/'.$img_type.';base64,'.$file_content;//合成图片的base64编码         $params['filename'] = $file;
         $params['basestring'] = $b64;
         
         $header = array('Content-Type:application/json','charset:utf-8','groupName:ns-v7g15','accountId:1626231450425742965');
      
         $result = $this->curl_request($url,json_encode($params),'POST',$header);
         
         $ret = json_decode($result,true);
         if ($ret['success']== 1){
             return $ret['data']['url'];
         }else{
             return '上传图片失败';
         }
     }