public FieldItemInterface::__set($property_name, $value)
Magic method: Sets a property value.
$property_name: The name of the property to set; e.g., 'title' or 'name'.
$value: The value to set, or NULL to unset the property. Optionally, a typed data object implementing Drupal\Core\TypedData\TypedDataInterface may be passed instead of a plain value.
\InvalidArgumentException If a not existing property is set.
public function __set($property_name, $value);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldItemInterface.php/function/FieldItemInterface::__set/8.1.x