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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 |
|---|---|
| 398 | * to update settings. |
| 399 | * |
| 400 | * @since 2.8.0 |
| 401 | * |
| 402 | * @param array $instance The current widget instance's settings. |
| 403 | * @param array $new_instance Array of new widget settings. |
| 404 | * @param array $old_instance Array of old widget settings. |
| 405 | * @param WP_Widget $this The current widget instance. |
| 406 | */ |
| 407 | $instance = apply_filters( 'widget_update_callback', $instance, $new_instance, $old_instance, $this ); |
| 408 | if ( false !== $instance ) { |
| 409 | $all_instances[$number] = $instance; |
| 410 | } |
| 411 | |
| 412 | break; // run only once |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | $this->save_settings($all_instances); |