public WidgetBase::settingsSummary()
Returns a short summary for the current widget settings.
If an empty result is returned, a UI can still be provided to display a settings form in case the widget has configurable settings.
array A short summary of the widget settings.
Overrides WidgetInterface::settingsSummary
public function settingsSummary() { return array(); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!WidgetBase.php/function/WidgetBase::settingsSummary/8.1.x