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