Mô hình ERD là gì? Ứng dụng của ERD trong quản lý bán hàng

Fatal error: Uncaught TypeError: shuffle(): Argument #1 ($array) must be of type array, null given in /home/web40/domains/web40.vn/public_html/views/theme-store/theme-child/custom/themes-sikido/data-themes.php:154 Stack trace: #0 /home/web40/domains/web40.vn/public_html/views/theme-store/theme-child/custom/themes-sikido/data-themes.php(154): shuffle() #1 /home/web40/domains/web40.vn/public_html/system/libraries/Hook.php(307): dataTheme::renderPostContent() #2 /home/web40/domains/web40.vn/public_html/system/plugin.php(203): WP_Hook->apply_filters() #3 /home/web40/domains/web40.vn/public_html/application/helpers/template_helper.php(56): apply_filters() #4 /home/web40/domains/web40.vn/public_html/views/theme-store/post-detail.php(17): the_content() #5 /home/web40/domains/web40.vn/public_html/system/core/Loader.php(839): include('...') #6 /home/web40/domains/web40.vn/public_html/system/core/Loader.php(420): CI_Loader->_ci_load() #7 /home/web40/domains/web40.vn/public_html/application/libraries/template.php(368): CI_Loader->view() #8 /home/web40/domains/web40.vn/public_html/views/theme-store/template-sidebar-right.php(19): Template->render_view() #9 /home/web40/domains/web40.vn/public_html/system/core/Loader.php(839): include('...') #10 /home/web40/domains/web40.vn/public_html/system/core/Loader.php(420): CI_Loader->_ci_load() #11 /home/web40/domains/web40.vn/public_html/application/libraries/template.php(346): CI_Loader->view() #12 /home/web40/domains/web40.vn/public_html/application/controllers/frontend/post.php(58): Template->render() #13 /home/web40/domains/web40.vn/public_html/system/core/CodeIgniter.php(360): Post->detail() #14 /home/web40/domains/web40.vn/public_html/index.php(224): require_once('...') #15 {main} thrown in /home/web40/domains/web40.vn/public_html/views/theme-store/theme-child/custom/themes-sikido/data-themes.php on line 154