Themes::_themeTree PHP Méthode

    private function _themeTree($directory, $return_link, $parent = '')
    {
        $current_path = $this->input->get('file') ? explode('/', $this->input->get('file')) : array();
        $theme_tree = '';
        $theme_tree .= $parent === '' ? '<nav class="nav"><ul class="metisFolder">' : '<ul>';
        $theme_files = find_theme_files($directory);
        if (!empty($theme_files)) {
            foreach ($theme_files as $file) {
                $active = in_array($file['name'], $current_path) ? ' active' : '';
                if ($file['type'] === 'dir') {
                    $parent_dir = $parent . '/' . $file['name'];
                    $theme_tree .= '<li class="directory' . $active . '"><a><i class="fa fa-folder-open"></i>&nbsp;&nbsp;' . htmlspecialchars($file['name']) . '</a>';
                    $theme_tree .= $this->_themeTree($directory . '/' . $file['name'], $return_link, $parent_dir);
                    $theme_tree .= '</li>';
                } else {
                    if ($file['type'] === 'img') {
                        $link = str_replace('{link}', $parent . '/' . urlencode($file['name']), $return_link);
                        $theme_tree .= '<li class="img' . $active . '"><a href="' . $link . '"><i class="fa fa-file-image-o"></i>&nbsp;&nbsp;' . htmlspecialchars($file['name']) . '</a></li>';
                    } else {
                        if ($file['type'] === 'file') {
                            $link = str_replace('{link}', $parent . '/' . urlencode($file['name']), $return_link);
                            $theme_tree .= '<li class="file' . $active . '"><a href="' . $link . '"><i class="fa fa-file-code-o"></i>&nbsp;&nbsp;' . htmlspecialchars($file['name']) . '</a></li>';
                        }
                    }
                }
            }
        }
        $theme_tree .= '</ul>';
        if ($parent === '') {
            $theme_tree .= '</nav>';
        }
        return $theme_tree;
    }