Admin PHP

    /**
     * function to display the selected backend page
     * @author MD
     * @date   2017-12-06
     * @param array           $data
     * @param Multi_Lang|null $class_multi_lang
     * @return bool|string
     */
    public function showSection($data, Multi_Lang $class_multi_lang = null)
    {
        if(!array_key_exists('section', $data) || !array_key_exists($data['section'], $this->section_mapping))
        {
            return false;
        }

        if(is_null($class_multi_lang))
        {
            $class_multi_lang = new Multi_Lang('backend', $_SESSION['admin_lang'], true);
        }

        $this->class_multi_lang = $class_multi_lang;

        $section_info = $this->section_mapping[$data['section']];

        if(!empty($section_info['class']))
        {
            $section_object = new $section_info['class']($class_multi_lang, $this->shop_settings);
        }
        else
        {
            $section_object = $this;
        }

        if(is_object($section_object))
        {
            $base_function = $section_info['function'];

            if(!empty($data['action']) && isset($section_info['actions'][$data['action']]))
            {
                $base_function = $section_info['actions'][$data['action']];
            }

            if(is_callable(array($section_object, $base_function)))
            {
                if(count($data) == 3) // with the parameters it is the default call so only transmit the id
                {
                    $response = $section_object->$base_function($data['id']);
                }
                else
                {
                    //first make a copy of the complete data then remove the section and action so only the needed data remains
                    $function_data = $data;

                    unset($function_data['section']);
                    unset($function_data['action']);

                    $response = $section_object->$base_function($function_data);
                }


                if($response['status'])
                {
                    $wiki_section   = $this->wikiReplaces($section_info['wiki'][$_SESSION['admin_lang']]);

                    $response['js_files']       = $section_info['js_files'];
                    $response['css_files']      = $section_info['css_files'];
                    $response['help_section']   = $section_info['handbook'][$_SESSION['admin_lang']];
                    $response['help_text']      = $this->getHelpText($wiki_section, $_SESSION['admin_lang'], $this->shop_settings['shop_id']);
                }

                return $response;
            }
            else
            {
                return 'Error function does not exist or is not callable';
            }
        }
        else
        {
            return 'Error while loading module';
        }
    }