IbanValidator.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Symfony\Component\Validator\Constraints;

use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;

/**
 * @author Manuel Reinhard <manu@sprain.ch>
 * @author Michael Schummel
 * @link http://www.michael-schummel.de/2007/10/05/iban-prufung-mit-php/
 */
class IbanValidator extends ConstraintValidator {

  /**
   * {@inheritDoc}
   */
  public function validate($value, Constraint $constraint) {
    if (null === $value || '' === $value) {
      return;
    }
    $teststring = preg_replace('/\\s+/', '', $value);
    if (strlen($teststring) < 4) {
      $this->context
        ->addViolation($constraint->message, array(
        '{{ value }}' => $value,
      ));
      return;
    }
    $teststring = substr($teststring, 4) . strval(ord($teststring[0]) - 55) . strval(ord($teststring[1]) - 55) . substr($teststring, 2, 2);
    $teststring = preg_replace_callback('/[A-Za-z]/', function ($letter) {
      return intval(ord(strtolower($letter[0])) - 87);
    }, $teststring);
    $rest = 0;
    $strlen = strlen($teststring);
    for ($pos = 0; $pos < $strlen; $pos += 7) {
      $part = strval($rest) . substr($teststring, $pos, 7);
      $rest = intval($part) % 97;
    }
    if ($rest != 1) {
      $this->context
        ->addViolation($constraint->message, array(
        '{{ value }}' => $value,
      ));
      return;
    }
  }

}