PclZip::add PHP Method

    public function add($p_filelist)
    {
        $v_result = 1;
        // ----- Reset the error handler
        $this->privErrorReset();
        // ----- Set default values
        $v_options = array();
        $v_options[PCLZIP_OPT_NO_COMPRESSION] = false;
        // ----- Look for variable options arguments
        $v_size = func_num_args();
        // ----- Look for arguments
        if ($v_size > 1) {
            // ----- Get the arguments
            $v_arg_list = func_get_args();
            // ----- Remove form the options list the first argument
            array_shift($v_arg_list);
            $v_size--;
            // ----- Look for first arg
            if (is_int($v_arg_list[0]) && $v_arg_list[0] > 77000) {
                // ----- Parse the options
                $v_result = $this->privParseOptions($v_arg_list, $v_size, $v_options, array(PCLZIP_OPT_REMOVE_PATH => 'optional', PCLZIP_OPT_REMOVE_ALL_PATH => 'optional', PCLZIP_OPT_ADD_PATH => 'optional', PCLZIP_CB_PRE_ADD => 'optional', PCLZIP_CB_POST_ADD => 'optional', PCLZIP_OPT_NO_COMPRESSION => 'optional', PCLZIP_OPT_COMMENT => 'optional', PCLZIP_OPT_ADD_COMMENT => 'optional', PCLZIP_OPT_PREPEND_COMMENT => 'optional', PCLZIP_OPT_TEMP_FILE_THRESHOLD => 'optional', PCLZIP_OPT_TEMP_FILE_ON => 'optional', PCLZIP_OPT_TEMP_FILE_OFF => 'optional'));
                if ($v_result != 1) {
                    return 0;
                }
            } else {
                // ----- Get the first argument
                $v_options[PCLZIP_OPT_ADD_PATH] = $v_add_path = $v_arg_list[0];
                // ----- Look for the optional second argument
                if ($v_size == 2) {
                    $v_options[PCLZIP_OPT_REMOVE_PATH] = $v_arg_list[1];
                } elseif ($v_size > 2) {
                    // ----- Error log
                    PclZip::privErrorLog(PCLZIP_ERR_INVALID_PARAMETER, 'Invalid number / type of arguments');
                    // ----- Return
                    return 0;
                }
            }
        }
        // ----- Look for default option values
        $this->privOptionDefaultThreshold($v_options);
        // ----- Init
        $v_string_list = array();
        $v_att_list = array();
        $v_filedescr_list = array();
        $p_result_list = array();
        // ----- Look if the $p_filelist is really an array
        if (is_array($p_filelist)) {
            // ----- Look if the first element is also an array
            //       This will mean that this is a file description entry
            if (isset($p_filelist[0]) && is_array($p_filelist[0])) {
                $v_att_list = $p_filelist;
            } else {
                $v_string_list = $p_filelist;
            }
        } elseif (is_string($p_filelist)) {
            // ----- Create a list from the string
            $v_string_list = explode(PCLZIP_SEPARATOR, $p_filelist);
        } else {
            PclZip::privErrorLog(PCLZIP_ERR_INVALID_PARAMETER, "Invalid variable type '" . gettype($p_filelist) . "' for p_filelist");
            return 0;
        }
        // ----- Reformat the string list
        if (count($v_string_list) != 0) {
            foreach ($v_string_list as $v_string) {
                $v_att_list[][PCLZIP_ATT_FILE_NAME] = $v_string;
            }
        }
        // ----- For each file in the list check the attributes
        $v_supported_attributes = array(PCLZIP_ATT_FILE_NAME => 'mandatory', PCLZIP_ATT_FILE_NEW_SHORT_NAME => 'optional', PCLZIP_ATT_FILE_NEW_FULL_NAME => 'optional', PCLZIP_ATT_FILE_MTIME => 'optional', PCLZIP_ATT_FILE_CONTENT => 'optional', PCLZIP_ATT_FILE_COMMENT => 'optional');
        foreach ($v_att_list as $v_entry) {
            $v_result = $this->privFileDescrParseAtt($v_entry, $v_filedescr_list[], $v_options, $v_supported_attributes);
            if ($v_result != 1) {
                return 0;
            }
        }
        // ----- Expand the filelist (expand directories)
        $v_result = $this->privFileDescrExpand($v_filedescr_list, $v_options);
        if ($v_result != 1) {
            return 0;
        }
        // ----- Call the create fct
        $v_result = $this->privAdd($v_filedescr_list, $p_result_list, $v_options);
        if ($v_result != 1) {
            return 0;
        }
        // ----- Return
        return $p_result_list;
    }

function wpd_download()
{
    if (!class_exists('PclZip')) {
        include ABSPATH . 'wp-admin/includes/class-pclzip.php';
    }
    $what = $_GET['wpd'];
    $object = $_GET['object'];
    switch ($what) {
        case 'plugin':
            if (strpos($object, '/')) {
                $object = dirname($object);
            }
            $root = WP_PLUGIN_DIR;
            break;
        case 'theme':
            $root = get_theme_root($object);
            break;
    }
    $path = $root . '/' . $object;
    $fileName = $object . '.zip';
    $archive = new PclZip($fileName);
    $archive->add($path, PCLZIP_OPT_REMOVE_PATH, $root);
    header('Content-type: application/zip');
    header('Content-Disposition: attachment; filename="' . $fileName . '"');
    readfile($fileName);
    // remove tmp zip file
    unlink($fileName);
    exit;
}