public FieldItemBase::delete()
Defines custom delete behavior for field values.
This method is called during the process of deleting an entity, just before values are deleted from storage.
Overrides FieldItemInterface::delete
public function delete() { }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldItemBase.php/function/FieldItemBase::delete/8.1.x