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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 |
|---|---|
| 559 | * |
| 560 | * @param WP_Widget $widget_object Widget object to call widget() on. |
| 561 | * @param array $instance Widget instance settings. |
| 562 | * @return string |
| 563 | */ |
| 564 | private function get_widget_form( $widget_object, $instance ) { |
| 565 | ob_start(); |
| 566 | |
| 567 | /** This filter is documented in wp-includes/class-wp-widget.php */ |
| 568 | $instance = apply_filters( |
| 569 | 'widget_form_callback', |
| 570 | $instance, |
| 571 | $widget_object |
| 572 | ); |
| 573 | |
| 574 | if ( false !== $instance ) { |
| 575 | $return = $widget_object->form( $instance ); |
| 576 | |
| 577 | /** This filter is documented in wp-includes/class-wp-widget.php */ |