how to zip folder in laravel 5?

need some help for laravel zip file. i have a folder in the public folder and i would like to create a zip of that folder (temp_file folder) whenever the user clicks the button.

public function testing()
{
    $public_dir = public_path('temp_file/');
    $zipFileName = 'myZip.zip';
    $zip = new ZipArchive;

    if ($zip->open($public_dir . '/' . $zipFileName, ZipArchive::CREATE) === TRUE) {
        $zip->addFile('file_path', 'file_name');
        $zip->close();
    }

    $headers = array('Content-Type' => 'application/octet-stream');

    $filetopath = $public_dir . '/' . $zipFileName; 
}

but it seems that it is not creating the zip file and i can't download it. Please need some help