Symfony\Component\Validator\ConstraintViolation::getPropertyPath PHP Method

    public function getPropertyPath()
    {
        return $this->propertyPath;
    }

 private function getLineNumber(ConstraintViolation $violation)
 {
     if (!preg_match('/lines\\[(\\d+)\\]/', $violation->getPropertyPath(), $matches)) {
         throw new \InvalidArgumentException(sprintf('Cannot get line number of string "%s". Format has to be: line[%line_number%]', $violation->getPropertyPath()));
     }
     return intval($matches[1]);
 }