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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.
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409 | if ( is_callable( $output_callback ) && ( ! isset( $wp_registered_widgets[ $id ] ) || did_action( 'widgets_init' ) ) ) { |
410 |
|
411 | /** |
412 | * Fires once for each registered widget. |
413 | * |
414 | * @since 3.0.0 |
415 | * |
416 | * @param array $widget An array of default widget arguments. |
417 | */ |
418 | do_action( 'wp_register_sidebar_widget', $widget ); |
419 | $wp_registered_widgets[ $id ] = $widget; |
420 | } |
421 | } |
422 |
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423 | /** |
424 | * Retrieve description for widget. |
425 | * |
426 | * When registering widgets, the options can also include 'description' that |
427 | * describes the widget for display on the widget administration panel or |