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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 |
|---|---|
| 548 | * |
| 549 | * @since 4.4.0 |
| 550 | * |
| 551 | * @see wp_update_nav_menu_item() |
| 552 | * |
| 553 | * @param int $menu_id ID of the updated menu. |
| 554 | * @param int $menu_item_db_id ID of the new menu item. |
| 555 | * @param array $args An array of arguments used to update/add the menu item. |
| 556 | */ |
| 557 | do_action( 'wp_add_nav_menu_item', $menu_id, $menu_item_db_id, $args ); |
| 558 | } |
| 559 | |
| 560 | /* |
| 561 | * Associate the menu item with the menu term. |
| 562 | * Only set the menu term if it isn't set to avoid unnecessary wp_get_object_terms(). |
| 563 | */ |
| 564 | if ( $menu_id && ( ! $update || ! is_object_in_term( $menu_item_db_id, 'nav_menu', (int) $menu->term_id ) ) ) { |
| 565 | $update_terms = wp_set_object_terms( $menu_item_db_id, array( $menu->term_id ), 'nav_menu' ); |
| 566 | if ( is_wp_error( $update_terms ) ) { |