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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 | 
|---|---|
| 1949 |      if ( isset($_POST['delete_widget']) && $_POST['delete_widget'] ) { | 
| 1950 |  | 
| 1951 |           if ( !isset($wp_registered_widgets[$widget_id]) ) | 
| 1952 |                wp_die( $error ); | 
| 1953 |  | 
| 1954 |           $sidebar = array_diff( $sidebar, array($widget_id) ); | 
| 1955 |           $_POST = array('sidebar' => $sidebar_id, 'widget-' . $id_base => array(), 'the-widget-id' => $widget_id, 'delete_widget' => '1'); | 
| 1956 |  | 
| 1957 |           /** This action is documented in wp-admin/widgets.php */ | 
| 1958 |           do_action( 'delete_widget', $widget_id, $sidebar_id, $id_base ); | 
| 1959 |  | 
| 1960 |      } elseif ( $settings && preg_match( '/__i__|%i%/', key($settings) ) ) { | 
| 1961 |           if ( !$multi_number ) | 
| 1962 |                wp_die( $error ); | 
| 1963 |  | 
| 1964 |           $_POST[ 'widget-' . $id_base ] = array( $multi_number => reset( $settings ) ); | 
| 1965 |           $widget_id = $id_base . '-' . $multi_number; | 
| 1966 |           $sidebar[] = $widget_id; | 
| 1967 |      } |