CI widget

public function build_categories($module_name, $table_id) {
        $modules = $this->get_modules();
        //module exist
        if (in_array($module_name, array_keys($modules))) {
            //get current module categories
            $categories = $this->db
                    ->select('c.id,c.p_id,c.status,c.img,ct.title,c.order')
                    ->join('categories_translate ct', "ct.table_id = c.id and ct.lang = '$this->site_lang'", 'left')
                    ->order_by('c.order')
                    ->get_where('categories c', array('c.module_id' => $modules[$module_name]->id))
                    ->result_array();
            if ($categories) {
                //setup assets
                $this->assets->add(array(
                    'css' => array(
                        'third_party/icheck/css/all.css'
                    ),
                    'js' => array(
                        'third_party/icheck/icheck.min.js',
                        'js/admin_save_modules_categories.js'
                    )
                ));
                //render view with data
                return $this->load->view(
                                $this->template->path.DIRECTORY_SEPARATOR.$this->template->componets_path.DIRECTORY_SEPARATOR.'modules_categories',
                                array(
                                    //build categories tree
                                    'categories' => getTree($categories),
                                    'module_id' => $modules[$module_name]->id,
                                    'table_id' => $table_id,
                                    //get selected categories
                                    'selected' => $this->selected_categories($modules[$module_name]->id, $table_id)
                                ),
                                true
                );
            }
        } else {
            log_message('error', "module {$module_name} not exist");
        }
        return null;
    }