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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 |
|---|---|
| 1230 | if ( ! empty( $_POST['item-object'] ) && isset( $items[$_POST['item-object']] ) ) { |
| 1231 | $menus_meta_box_object = $items[ $_POST['item-object'] ]; |
| 1232 | /** |
| 1233 | * Filter a nav menu meta box object. |
| 1234 | * |
| 1235 | * @since 3.0.0 |
| 1236 | * |
| 1237 | * @param object $menus_meta_box_object A nav menu meta box object, such as Page, Post, Category, Tag, etc. |
| 1238 | */ |
| 1239 | $item = apply_filters( 'nav_menu_meta_box_object', $menus_meta_box_object ); |
| 1240 | ob_start(); |
| 1241 | call_user_func_array($callback, array( |
| 1242 | null, |
| 1243 | array( |
| 1244 | 'id' => 'add-' . $item->name, |
| 1245 | 'title' => $item->labels->name, |
| 1246 | 'callback' => $callback, |
| 1247 | 'args' => $item, |
| 1248 | ) |