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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 |
|---|---|
| 157 | * |
| 158 | * @since 3.0.1 |
| 159 | * @since 4.1.0 The `$depth` parameter was added. |
| 160 | * |
| 161 | * @param string $menu_id The ID that is applied to the menu item's `<li>` element. |
| 162 | * @param WP_Post $item The current menu item. |
| 163 | * @param stdClass $args An object of wp_nav_menu() arguments. |
| 164 | * @param int $depth Depth of menu item. Used for padding. |
| 165 | */ |
| 166 | $id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args, $depth ); |
| 167 | $id = $id ? ' id="' . esc_attr( $id ) . '"' : ''; |
| 168 | |
| 169 | $output .= $indent . '<li' . $id . $class_names .'>'; |
| 170 | |
| 171 | $atts = array(); |
| 172 | $atts['title'] = ! empty( $item->attr_title ) ? $item->attr_title : ''; |
| 173 | $atts['target'] = ! empty( $item->target ) ? $item->target : ''; |
| 174 | $atts['rel'] = ! empty( $item->xfn ) ? $item->xfn : ''; |
| 175 | $atts['href'] = ! empty( $item->url ) ? $item->url : ''; |