how to decode Java stream in PHP

I requested Walmart report API and the result would be returned zip file stream.Refer to the API documents,it gives an example to realize it with Java code as the following below:

if (response.getStatus() == Response.Status.OK.getStatusCode() && response.hasEntity()) {
  InputStream inputStream = (InputStream)response.getEntity();
  try {
    String header = response.getHeaderString("Content-Disposition");
    if(header != null && !("").equals(header)) {
      if(header.contains("filename")){
        //header value will be something like:
        //attachment; filename=10000000354_2016-01-15T23:09:54.438+0000.zip
        int length = header.length();
        String fileName = header.substring(header.indexOf("filename="),length);
        System.out.println("filenameText " + fileName);
        String [] str = fileName.split("=");
        System.out.println("fileName: " + str[1]);
        //replace "/Users/anauti1/Documents/" below with your values
        File reportFile = new File("/Users/anauti1/Documents/" + str[1].toString());
        OutputStream outStream = new FileOutputStream(reportFile);
        byte[] buffer = new byte[8 * 1024];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
          outStream.write(buffer, 0, bytesRead);
        }
        IOUtils.closeQuietly(inputStream);
        IOUtils.closeQuietly(outStream);
      }
    }
  }
  catch (Exception ex){
    System.out.print("Exception: " + ex.getMessage());
  }
}

However,if I use php like:

try {
                        $header = $resultInfo->getHeader('Content-Disposition');
                        if (!empty($header)) {
                            if (strpos($header, 'filename') !== false) {
                                $filename = substr($header, strpos($header, 'filename'));
                                $str = explode('=', $filename);
                                $body = $resultInfo->getBody();
                                $fp = fopen(storage_path("csv/{$str[1]}"), 'w');
                                fwrite($fp, $body);
                                fclose($fp);
                            }
                        }
                    } catch (\Exception $e) {
                        echo $e->getMessage();
                    }

It would download zip file but the file data is corrupt.It maybe such a reason like the byte stream is transfered by using Java code.It's the problem about how to transform the bytes stream.Could you help me? By th way,I have cut parts of the stream as the following below:

b"PK\x03\x04\x14\x00\x00\x00\x08\x00\x10`‚OI^\x07RÒƒ\x04\x00Óo\x10\x004\x00\x00\x00ItemReport_10001023965_2019-12-02T115111.5040000.csvì½YsÛÈ–.ú~#î\x7F`ì‡>

Headers like this:

-headers: array:11 [
            "accept-ranges" => array:1 [
              0 => "bytes"
            ]
            "content-disposition" => array:1 [
              0 => "attachment; filename=ItemReport_10001023965_2019-12-02T115111.5040000.zip"
            ]
            "content-type" => array:1 [
              0 => "application/zip"
            ]
            "x-tb" => array:1 [
              0 => "0"
            ]
            "expires" => array:1 [
              0 => "Wed, 04 Dec 2019 02:33:20 GMT"
            ]
            "cache-control" => array:1 [
              0 => "max-age=0, no-cache, no-store"
            ]
            "pragma" => array:1 [
              0 => "no-cache"
            ]
            "date" => array:1 [
              0 => "Wed, 04 Dec 2019 02:33:20 GMT"
            ]
            "transfer-encoding" => array:1 [
              0 => "chunked"
            ]
            "connection" => array:2 [
              0 => "keep-alive"
              1 => "Transfer-Encoding"
            ]
            "set-cookie" => array:1 [
              0 => "TS0d138f181a7bb55a8f02b54ee05b24ba9b4832fa32c8b0a9c4cb8592e5d1e4d02765d16ec77313d435d3ade8; Path=/; Secure"
            ]
          ]
          -headerNames: array:11 [
            "accept-ranges" => "Accept-Ranges"
            "content-disposition" => "Content-Disposition"
            "content-type" => "Content-Type"
            "x-tb" => "X-Tb"
            "expires" => "Expires"
            "cache-control" => "Cache-Control"
            "pragma" => "Pragma"
            "date" => "Date"
            "transfer-encoding" => "Transfer-Encoding"
            "connection" => "Connection"
            "set-cookie" => "Set-Cookie"
          ]

I just found that the transfer-encoding is chuncked.I'm not sure it's this problem?

Did you resolve the issue? The below simple code worked for me

    $fp = fopen('/your path where you store the zip file/'.$filename, 'w+'); 
    if ($fp == FALSE){ 
      print "File not opened<br>"; 
      exit; 
    }
    fwrite($fp, $response);
    fclose($fp);

$response is the body of API response, which will be unreadable format $filename zip filename got from the header.