如何使用菜单和角色表生成树结构

Question

我有3个表，其中1个用于role，menu和role_menu，我希望结果为

我已经使用以下函数成功生成了ul和li。面临如何放置角色及其下的每个菜单的问题。

public function get_menu() {
    $this->db->select('ms.menu_id as id,ms.menu_name,ms.menu_title,ms.type,ms.link,ms.is_active,ms.parent as parentid,ms.icons,rm.is_active,rm.role_id');
    $this->db->from('menu_settings ms');
    $this->db->join('role_menus rm', 'rm.menu_id =  ms.menu_id', 'INNER');
    //$this->db->join('role r', 'r.role_id =  rm.role_id', 'INNER');
    $this->db->group_by('ms.menu_id','desc'); 
    $query = $this->db->get();
    $rResult_array = $query->result_array();

    #echo $this->db->last_query();exit;
    $menu = array(
        'menus' => array(),
        'parent_menus' => array(),
    );
    foreach ($rResult_array as $key => $value) {
        $menu['role_id'][$rResult_array[$key]['role_id']] = $rResult_array[$key]['role_id'];
        $menu['menus'][$rResult_array[$key]['id']] = $value;
        $menu['parent_menus'][$rResult_array[$key]['parentid']][] = $rResult_array[$key]['id'];
    }

    //$this->load->model('Common');
    //$all_roles = $this->Common->get_records('role', $column = '', $where = '', $start = '', $limit = '', $flag_total_count = "NO");
    $side_bar_menu = $this->buildMenu1(0, $menu);

    return $side_bar_menu;
}

public function buildMenu($parent, $menu) {

    $html = "";
    if (isset($menu['parent_menus'][$parent])) {

        if ($parent <= 0)
            $html .= "<ul class=''>";
        else
            $html .= '<ul class="">';

        $countfor_active = 0;
        foreach ($menu['parent_menus'][$parent] as $menu_id) {

            $li_parentclass = ' ';
            if (!isset($menu['parent_menus'][$menu_id])) {
                $html .= "<li class='" . $li_parentclass . "'><span>" . $menu['menus'][$menu_id]['menu_name'] . "</span></li>";
            }
            if (isset($menu['parent_menus'][$menu_id])) {

                $html .= "<li><span>" . $menu['menus'][$menu_id]['menu_name'] . "</span>";
                $html .= $this->buildMenu($menu_id, $menu);
                $html .= "</li>";
            }
        }
        $html .= "</ul>";
    }
    return $html;
}

• 管理员
• 仪表板

• 用户

  • 管理用户
  • 管理角色

• 客户

  • 仪表板
  • 用户
  • 管理用户
  • 管理角色