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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 |
|---|---|
| 185 | * |
| 186 | * @since 3.0.0 |
| 187 | * @since 4.1.0 The `$depth` parameter was added. |
| 188 | * |
| 189 | * @param string[] $classes Array of the CSS classes that are applied to the menu item's `<li>` element. |
| 190 | * @param WP_Post $menu_item The current menu item object. |
| 191 | * @param stdClass $args An object of wp_nav_menu() arguments. |
| 192 | * @param int $depth Depth of menu item. Used for padding. |
| 193 | */ |
| 194 | $class_names = implode( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $menu_item, $args, $depth ) ); |
| 195 | |
| 196 | /** |
| 197 | * Filters the ID attribute applied to a menu item's list item element. |
| 198 | * |
| 199 | * @since 3.0.1 |
| 200 | * @since 4.1.0 The `$depth` parameter was added. |
| 201 | * |
| 202 | * @param string $menu_item_id The ID attribute applied to the menu item's `<li>` element. |
| 203 | * @param WP_Post $menu_item The current menu item. |