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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 |
---|---|
149 | * |
150 | * @since 3.0.0 |
151 | * @since 4.1.0 The `$depth` parameter was added. |
152 | * |
153 | * @param string[] $classes Array of the CSS classes that are applied to the menu item's `<li>` element. |
154 | * @param WP_Post $menu_item The current menu item object. |
155 | * @param stdClass $args An object of wp_nav_menu() arguments. |
156 | * @param int $depth Depth of menu item. Used for padding. |
157 | */ |
158 | $class_names = implode( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $menu_item, $args, $depth ) ); |
159 | $class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : ''; |
160 |
|
161 | /** |
162 | * Filters the ID attribute applied to a menu item's list item element. |
163 | * |
164 | * @since 3.0.1 |
165 | * @since 4.1.0 The `$depth` parameter was added. |
166 | * |
167 | * @param string $menu_item_id The ID attribute applied to the menu item's `<li>` element. |