WP_Widget::update()
Method: Updates a particular instance of a widget.
Source: wp-includes/class-wp-widget.php:131
WP_Widget::form_callback()
Method: Generates the widget control form (Do NOT override).
Source: wp-includes/class-wp-widget.php:503
WP_Widget::form()
Method: Outputs the settings update form.
Source: wp-includes/class-wp-widget.php:143
widget_form_callback
Filter Hook: Filters the widget instance’s settings before displaying the control form.
Source: wp-includes/class-wp-widget.php:530