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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 66 | /** |
| 67 | * Filters the CSS class(es) applied to a menu list element. |
| 68 | * |
| 69 | * @since 4.8.0 |
| 70 | * |
| 71 | * @param string[] $classes Array of the CSS classes that are applied to the menu `<ul>` element. |
| 72 | * @param stdClass $args An object of `wp_nav_menu()` arguments. |
| 73 | * @param int $depth Depth of menu item. Used for padding. |
| 74 | */ |
| 75 | $class_names = implode( ' ', apply_filters( 'nav_menu_submenu_css_class', $classes, $args, $depth ) ); |
| 76 | $class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : ''; |
| 77 | |
| 78 | $output .= "{$n}{$indent}<ul$class_names>{$n}"; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Ends the list of after the elements are added. |
| 83 | * |
| 84 | * @since 3.0.0 |