Scalar::setValue

public function setValue($value, $key, $item, array $parameters = array())
{
	$value = $this->makeValueSafe($value, $key, $item, $parameters);

	if($this->isCacheable())
	{
		$keepExisting = array_key_exists('KEEP_EXISTING_VALUE', $parameters) && $parameters['KEEP_EXISTING_VALUE'] === true;

		if(!$item->containsKey($key) || !$keepExisting)
		{
			$item->offsetSetDirect($key, $value);
		}
	}

	return $value;
}