Simple menu class

gistfile1.php

<?php

class menu
{
    private $data_arr = array();
    private $page_name = '';
    private $default_module = '';

    /**
     * @param array $data_arr
     * @param string $page_name
     * @param string $default_module
     */
    public function __construct($data_arr, $page_name, $default_module = 'content')
    {
        $this->data_arr = $data_arr;
        $this->page_name = $page_name;
        $this->default_module = $default_module;
    }

    /**
     * @param string $redirect
     * @param string $anchor
     * @param string $module
     * @return string
     */
    protected function get_href($redirect, $anchor, $module = 'content')
    {
        return ($redirect) ? $redirect . '/' : "/$module/$anchor.html";
    }

    /**
     * @return string
     */
    public function getDefaultModule()
    {
        return $this->default_module;
    }

    /**
     * @return array
     */
    protected function getDataArr()
    {
        return $this->data_arr;
    }

    /**
     * @return string
     */
    protected function getPageName()
    {
        return $this->page_name;
    }

    /**
     * @return bool|string
     */
    public function get_li()
    {
        $data_arr = $this->data_arr;
        if (is_array($data_arr)) {
            $list_items = '';

            foreach ($data_arr as $row) {
                if (is_array($row) && !empty($row['anchor'])) {
                    if ($row['anchor'] === $this->getPageName()) {
                        $list_items .= "<li><span>{$row['name']}</span></li>";
                    } else {
                        $redirect = (isset($row['redirect'])) ? $row['redirect'] : '';
                        $href = $this->get_href($redirect, $row['anchor']);
                        $list_items .= "<li><a href=\"$href\">{$row['name']}</a></li>";
                    }
                } else {
                    continue;
                }
            }

            return $list_items;
        }

        return false;
    }
}

class nestedMenu extends menu
{
    public function get_li($nest_level = 0, $module = '')
    {
        if(!$module) {
            $module = parent::getDefaultModule();
        }
        $data_arr = parent::getDataArr();
        if (is_array($data_arr)) {
            $list_items = '';

            foreach ($data_arr as $row) {
                if (
                    is_array($row) &&
                    ( !empty($row['anchor']) || !empty($row['redirect']) ) &&
                    $row['parent'] == $nest_level
                ) {
                    if ($row['anchor'] === parent::getPageName()) {
                        $list_items .= "<li><span>{$row['name']}</span></li>";
                    } else {
                        $redirect = (!empty($row['redirect'])) ? $row['redirect'] : '';
                        $href = parent::get_href($redirect, $row['anchor'], $module);
                        $parent = ($row['parent']) ? $row['parent'] : 0;
                        $id = ($row['id']);
                        $nested_ul = '';

                        if (!$parent) {
                            $nested_ul = $this->get_li($id, $redirect);
                            if ($nested_ul) {
                                $nested_ul = "<ul class='nested'>$nested_ul</ul>";
                            }
                        }

                        $list_items .= "<li><a href=\"$href\">{$row['name']}</a>$nested_ul</li>";
                    }
                } else {
                    continue;
                }
            }

            return $list_items;
        }

        return false;
    }
}