Laravel packages multiple files and downloads them

// Clear all files in the path 
 delete_dir(public_path() . "/upload/data/");
            $res = Evidence::whereIn("id", $this->data['evidences_id'])
                ->get();
            foreach ($res as $v) {
                $type = $v->file_md5;
                $file_url = $v->upload_path;
                if (!is_dir(public_path() . "/upload/data/")) mkdir(public_path() . "/upload/data/", 0777);
                $dir = public_path() . "/upload/data/{$type}";
                if (!is_dir($dir)) mkdir($dir, 0777);
                // Download remote files to local folder   most 3 Otherwise, the download fails 
                $n = 0;
                do {
                    if (@copy(trim($file_url), public_path() . "/upload/data/{$type}/" . basename($file_url))) {
                        break;
                    } else {
                        $n++;
                        sleep(1);
                        if ($n >= 3) {
                            Download::where("id", $this->download->id)->update(["status" => 2, "error_msg" => " File download failed "]);
                            break;
                        }
                    }
                } while (true);
            }
            //2. Package and download local folders 
            // initialization zip  name 
            $zipName = date("YmdHis") . 'file.zip';
            $zip_file = str_replace("\\", '/', public_path("download/$type")) . $zipName;
            $zip = new \ZipArchive();
            $zip->open($zip_file, \ZipArchive::CREATE | \ZipArchive::OVERWRITE);
            // The folder will be compressed 
            $path = str_replace("\\", '/', public_path("upload/data/{$type}"));
            if (count($res) > 1) {
                $path = str_replace("\\", '/', public_path("upload/data/"));
            }
            // iterator 
            $files = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($path));
            foreach ($files as $file) {
                // Skip all subdirectories 
                if (!$file->isDir()) {
                    // Get file path 
                    $filePath = $file->getRealPath();
                    // Get the file name 
                    $fileName = $file->getFilename();
//                    $zip->addFile($filePath, $fileName);
                    $fp = fopen($filePath, "rb", 0);
                    $arr = explode('\\', $filePath);
                    $dir = $arr[count($arr) - 2];
                    $images = fread($fp, filesize($file));
                    $zip->addFromString("$dir/" .$fileName, $images);
                }
            }
            $zip->close();
            $url = config('app.url') . "download/$type$zipName";
            chmod($zip_file, 0777);
            Download::where("id", $this->download->id)->update(["status" => 1, "path" => $url]);
//        return response()->download($zip_file, $zipName)->deleteFileAfterSend(true);// Download the generated zip file