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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 |
|---|---|
| 506 | * Filters the widget instance's settings before displaying the control form. |
| 507 | * |
| 508 | * Returning false effectively short-circuits display of the control form. |
| 509 | * |
| 510 | * @since 2.8.0 |
| 511 | * |
| 512 | * @param array $instance The current widget instance's settings. |
| 513 | * @param WP_Widget $this The current widget instance. |
| 514 | */ |
| 515 | $instance = apply_filters( 'widget_form_callback', $instance, $this ); |
| 516 | |
| 517 | $return = null; |
| 518 | if ( false !== $instance ) { |
| 519 | $return = $this->form( $instance ); |
| 520 | |
| 521 | /** |
| 522 | * Fires at the end of the widget control form. |
| 523 | * |
| 524 | * Use this hook to add extra fields to the widget form. The hook |