apply_filters( ‘nav_menu_submenu_css_class’, string[] $classes, stdClass $args, int $depth )

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   wpuzman 6 years ago

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   function wpdocs_custom_dropdown_class( $classes ) {
   	$classes[] = 'dropdown';
   
   	return $classes;
   }
   
   add_filter( 'nav_menu_submenu_css_class', 'wpdocs_custom_dropdown_class' );