Zip folder in PHP only with files

I created a routine to create a zip file of a folder in PHP that is working, but inside the zip is created the entire folder structure on the server and I do not want it to create so, I would like you to create only with the files of folder.

The function that checks the files is this:

    $NomesArquivos = array();
    function lista_arquivos($dir) {
    global $NomesArquivos;
        if ($handle = opendir($dir)) {
            while (false !== ($file = readdir($handle))) {
                if ($file != "." && $file != ".." && is_file($dir.'/'.$file)) {
                    $NomesArquivos[] = $dir.'/'.$file;
                }
            }
            closedir($handle);
        }
        return $NomesArquivos;
    }
    lista_arquivos($caminhopasta);

What do I need to change?