zipfile::file PHP Méthode

    function file()
    {
        $data = implode('', $this->datasec);
        $ctrldir = implode('', $this->ctrl_dir);
        return $data . $ctrldir . $this->eof_ctrl_dir . pack('v', sizeof($this->ctrl_dir)) . pack('v', sizeof($this->ctrl_dir)) . pack('V', strlen($ctrldir)) . pack('V', strlen($data)) . "";
    }

function makezip($zipname, $ad_dir)
{
    $zipfilename = $zipname;
    $zip_subfolder = '';
    $ad_dir = $ad_dir;
    // form is posted, handle it
    $zipfile = new zipfile();
    // generate _settings into zip file
    //$zipfile ->addFile( stripcslashes( $settings ), $zip_subfolder . '/_settings.php' );
    if ($handle = opendir($ad_dir)) {
        while (false !== ($file = readdir($handle))) {
            if (!is_dir($file) && $file != "." && $file != "..") {
                $f_tmp = @fopen($ad_dir . '/' . $file, 'r');
                if ($f_tmp) {
                    $dump_buffer = fread($f_tmp, filesize($ad_dir . '/' . $file));
                    $zipfile->addFile($dump_buffer, $zip_subfolder . '/' . $file);
                    fclose($f_tmp);
                }
            }
        }
        $dump_buffer = $zipfile->file();
        // write the file to disk:
        $file_pointer = fopen($zipfilename, 'w');
        if ($file_pointer) {
            fwrite($file_pointer, $dump_buffer, strlen($dump_buffer));
            fclose($file_pointer);
        }
        // response zip archive to browser:
        header('Pragma: public');
        header('Content-type: application/zip');
        header('Content-length: ' . strlen($dump_buffer));
        header('Content-Disposition: attachment; filename="' . $zipfilename . '"');
        echo $dump_buffer;
    }
}