Parameters

$widget_id

(array) An associative array of widget arguments.

• 'name'
  (string) Name of the widget.
• 'id'
  (string) Widget ID.
• 'callback'
  (callable) When the hook is fired on the front end, $callback is an array containing the widget object. Fired on the back end, $callback is 'wp_widget_control', see $_callback.
• 'params'
  (array) An associative array of multi-widget arguments.
• 'classname'
  (string) CSS class applied to the widget container.
• 'description'
  (string) The widget description.
• '_callback'
  (array) When the hook is fired on the back end, $_callback is populated with an array containing the widget object, see $callback.