public FieldItemList::__isset($property_name)
Magic method: Determines whether a property of the first field item is set.
Overrides FieldItemListInterface::__isset
\Drupal\Core\Field\FieldItemInterface::__unset()
public function __isset($property_name) { if ($item = $this->first()) { return $item->__isset($property_name); } return FALSE; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldItemList.php/function/FieldItemList::__isset/8.1.x