public FieldItemListInterface::__unset($property_name)
Magic method: Unsets a property of the first field item.
\Drupal\Core\Field\FieldItemInterface::__isset()
public function __unset($property_name);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldItemListInterface.php/function/FieldItemListInterface::__unset/8.1.x