项目场景：

绝对路径图片转换成文件流请求文件上传接口

因为我的uploadImgAndFile 接口接收的是前端传的文件流来调用华为云obs 如果我想将一张绝对路径的文件传到华为云需要将其转换成文件流来请求接口以下是代码。

@Override
    //请求接口地址 参数 文件
    function upload($url='https://api.xhjrbkp.com/api/file/uploadImgAndFile', $data='', $file='https://img.xhjrbkp.com/MTYzOTEwNjc5NXE1T3NDeDdQ.6m.png') {
        $param = [
            //此处根据实际文件的上传的 name 填写
            'file' => file_get_contents($file),
            'type' =>1,
        ];
        if (!empty($data)) {
            arrary_merge($data, $param);
        }
        $delimiter = uniqid();
        $data = '';
        $eol = "\r\n";
        $upload = $param['file'];
        unset($param['file']);
        foreach ($param as $name => $content) {
            $data .= "--" . $delimiter . "\r\n"
                . 'Content-Disposition: form-data; name="' . $name . "\"\r\n\r\n"
                . $content . "\r\n";
        }
        // 拼接文件流  name="fileData"; filename="1.png"' 根据实际的文件 name 和名字填写 或写个变量
        //'Content-Type: image/gif'可改为'Content-Type:application/octet-stream' 由于我是测试的网站必须为 gif 所以就这样吧先
        $data .= "--" . $delimiter . $eol
            . 'Content-Disposition: form-data; name="file"; filename="https://img.xhjrbkp.com/MTYzOTEwNjc5NXE1T3NDeDdQ.6m.png"' . "\r\n"
            . 'Content-Type: image/gif' . "\r\n\r\n";

        $data .= $upload . "\r\n";
        $data .= "--" . $delimiter . "--\r\n";
        $post_data = $data;
        $curl = curl_init($url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_POST, true);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $post_data);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($curl, CURLOPT_HTTPHEADER, [
            "Content-Type: multipart/form-data; boundary=" . $delimiter,
            "Content-Length: " . strlen($post_data),
        ]);
        $response = curl_exec($curl);
        curl_close($curl);
        return $response;
    }

@Override
     public function uploadImgAndFile(Request $request){
        $file=$request->file('file');
        $type=input('type');
        $id=input('id');
        if($type==1){
            $prefix='platform_'.$id;
        }elseif($type==2){
            $prefix='general_backstage';
        }
        if(empty($file)){
            $data = ['code' => 400, 'msg' => '文件不能为空', 'data' => ''];
            return json($data);
        }else{
                $info = $file->getInfo();
                //上传文件最大大小,单位M
                $maxSize = 10;
                //支持的上传文件类型
                $allowed_extensions = ["png", "jpg", "gif","pdf"];
                //返回信息json
                $data = ['code' => 400, 'msg' => '上传文件失败', 'data' => ''];
                if ($info['error']>0) {
                    $data['msg'] = $_FILES["file"]["error"];
                    return json($data);
                } else {
                    //检测文件类型
                    if (!in_array(strtolower(substr(strrchr($info['name'], '.'), 1)), $allowed_extensions)) {
                        $data['msg'] = "请上传" . implode(",", $allowed_extensions) . "格式的文件";
                        return json($data);
                    }
                    //检测文件大小
                    if ($info['size'] > $maxSize * 1024 * 1024) {
                        $data['msg'] = "文件大小限制" . $maxSize . "M";
                        return json($data);
                    }
                }
                $newFile = $prefix.'/'.date('Ymd')."/".getRandomString(10).strrchr($info['name'], '.');
                try {
                    $resp = $this->obsClient->putObject([
                        'Bucket' => $this->bucketName,//桶名
                        'Key' => $newFile,// （文件路径1/文件路径2/文件名.文件后缀）
                        'Body' =>$file,
                        'ACL' => ObsClient::AclPublicRead,//设置对象访问权限为公共读
                    ]);

                    if($resp ['HttpStatusCode']==200){//$resp ['HttpStatusCode']状态码 200就是成功
                        $data = [
                            'code' => 200,
                            'msg' => '上传文件成功',
                            'data' => $resp ['ObjectURL'],//华为云上的文件地址
                        ];
                    }else{
                        $data['mess'] = $resp ['HttpStatusCode'].':'.$resp['Reason'];
                    }
                } catch ( ObsException $e ) {
                    $data['msg']=$e->getMessage();
                }
            return json($data);
        }
    }