Neos\ContentRepository\Eel\FlowQueryOperations\FilterOperation::getPropertyPath PHP Метод

    protected function getPropertyPath($element, $propertyPath)
    {
        if ($propertyPath[0] === '_') {
            return ObjectAccess::getPropertyPath($element, substr($propertyPath, 1));
        } else {
            return $element->getProperty($propertyPath);
        }
    }