App\Http\Controllers\Admin\ContestsController::gimmeZip PHP Method

    public function gimmeZip($id)
    {
        set_time_limit(300);
        $contest = Contest::findOrFail($id);
        $entries = UserContestEntry::where('contest_id', $id)->with('user')->get();
        $tmpBase = sys_get_temp_dir() . "/c{$id}-" . time();
        $workingFolder = "{$tmpBase}/working";
        $outputFolder = "{$tmpBase}/out";
        try {
            if (!is_dir($workingFolder)) {
                mkdir($workingFolder, 0755, true);
            }
            if (!is_dir($outputFolder)) {
                mkdir($outputFolder, 0755, true);
            }
            // fetch entries
            foreach ($entries as $entry) {
                $targetDir = "{$workingFolder}/" . ($entry->user ?? new \App\Models\DeletedUser())->username . " ({$entry->user_id})/";
                if (!is_dir($targetDir)) {
                    mkdir($targetDir, 0755, true);
                }
                copy($entry->fileUrl(), "{$targetDir}/" . sanitize_filename($entry->original_filename));
            }
            // zip 'em
            $zipOutput = "{$outputFolder}/contest-{$id}.zip";
            $zip = new \ZipArchive();
            $zip->open($zipOutput, \ZipArchive::CREATE);
            foreach (glob("{$workingFolder}/**/*.*") as $file) {
                // we just want the path relative to the working folder root
                $new_filename = str_replace("{$workingFolder}/", '', $file);
                $zip->addFile($file, $new_filename);
            }
            $zip->close();
            // send 'em on their way
            header('Content-Disposition: attachment; filename=' . basename($zipOutput));
            header('Content-Type: application/zip');
            header('Expires: 0');
            header('Cache-Control: must-revalidate');
            header('Pragma: public');
            header('Content-Length: ' . filesize($zipOutput));
            readfile($zipOutput);
        } finally {
            deltree($tmpBase);
        }
    }