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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 |
|---|---|
| 460 | isset( $request['form_data'][ "widget-$id" ] ) && |
| 461 | is_array( $request['form_data'][ "widget-$id" ] ) |
| 462 | ) { |
| 463 | $new_instance = array_values( $request['form_data'][ "widget-$id" ] )[0]; |
| 464 | $old_instance = $instance; |
| 465 | |
| 466 | $instance = $widget_object->update( $new_instance, $old_instance ); |
| 467 | |
| 468 | /** This filter is documented in wp-includes/class-wp-widget.php */ |
| 469 | $instance = apply_filters( |
| 470 | 'widget_update_callback', |
| 471 | $instance, |
| 472 | $new_instance, |
| 473 | $old_instance, |
| 474 | $widget_object |
| 475 | ); |
| 476 | } |
| 477 | |
| 478 | $serialized_instance = serialize( $instance ); |