class AllValidator

AllValidatorTest.php in drupal/core/vendor/symfony/validator/Symfony/Component/Validator/Tests/Constraints/AllValidatorTest.php

class AllValidator extends ConstraintValidator {

  /**
   * {@inheritDoc}
   */
  public function validate($value, Constraint $constraint) {
    if (null === $value) {
      return;
    }
    if (!is_array($value) && !$value instanceof \Traversable) {
      throw new UnexpectedTypeException($value, 'array or Traversable');
    }
    $group = $this->context
      ->getGroup();
    foreach ($value as $key => $element) {
      foreach ($constraint->constraints as $constr) {
        $this->context
          ->validateValue($element, $constr, '[' . $key . ']', $group);
      }
    }
  }

}