I finally done like this: $form_styles_header = [ “1” => “forms/vendor/bootstrap/css/bootstrap.min.css”, “2” => “forms/fonts/font-awesome-4.7.0/css/font-awesome.min.css”, “3” => “forms/vendor/animate/animate.css”, “4” => “forms/vendor/css-hamburgers/hamburgers.min.css”, “5” => “forms/vendor/animsition/css/animsition.min.css”, “6” => “forms/vendor/select2/select2.min.css”, “7” => “forms/vendor/daterangepicker/daterangepicker.css”, “8” => “forms/css/util.css”, “9” => “forms/css/main.css”, “10” => “table/css/table-styles.css” ]; foreach ($form_styles_header as $no=>$form_style) { wp_enqueue_style(‘du_form_style’.$no, $d_utility_url.”/assets/”.$form_style); } where $d_utility_url is the path to my plugin. … Read more