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elfproef.php

Checks the validity of a dutch bank account number

Added: 2009-12-02 16:06:29

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<?
/**
* This function can verify if a given number is a valid dutch bank-account number (not giro)
*
* @param String $bankAccountNr
*
* @return Boolean
*/
function elfProef($bankAccountNr)
{
   $return   = False;
   $length   = strlen($bankAccountNr);
   $sum   = 0;
   // we only continu if the length is exactly 9 characters
   if (9 == $length)
   {
      for ($i = 1; $i <= 9; ++$i)
      {
         $sum += $i * substr($bankAccountNr, (9 - $i), 1);
      }

      if (0 == $sum % 11)
      {
         $return   = True;
      }
   }

   // we return the results
   return $return;
}


# The following class does the same as the function above, except that it can be used as a Zend_Validator;
# for those of you who are using the Zend Framework
# I would recommend using it if you can, since the it gives more feedback about what is wrong with the input
# than the function above


/**
* @category   Zend
* @package    Zend_Validate
* @copyright  Copyright (c) 2009 Martijn Korse (http://devshed.excudo.net)
* @license    http://framework.zend.com/license/new-bsd     New BSD License
*/
class Excudo_Validate_Elfproef extends Zend_Validate_Abstract
{
   /**
    *  Validation failure message key for when the value has a length that is not exactly 9
    */
   const INVALID_LENGTH      = 'lengthInvalid';

   /**
    *  Validation failure message key for when the value is not a valid bank-account number
    */
   const INVALID_ACCOUNT_NO      = 'bankAccountInvalid';

   /**
    * Validation failure message template definitions
    *
    * @var array
    */
   protected $_messageTemplates = array(
      self::INVALID_LENGTH      => "'%value%' appears to have an invalid length",
      self::INVALID_ACCOUNT_NO   => "'%value%' is not a valid (dutch) bank-account number"
   );

   /**
    * Constructor
    *
    * @return Excudo_Validate_Elfproef
    */
   public function __construct()
   {
      ;
   }

   /**
    * Defined by Zend_Validate_Interface
    *
    * Returns true if $bankAccountNr is a valid (dutch) bank-account number.
    * This validation will fail for postbank account-numbers!
    *
    * @param  string $bankAccountNr
    *
    * @return boolean
    */
   public function isValid($bankAccountNr)
   {
      $this->_setValue($bankAccountNr);

      $return   = false;
      $length   = strlen($bankAccountNr);
      $sum   = 0;
      // we only continue if the length is exactly 9 characters
      if (9 == $length)
      {
         for ($i = 1; $i <= 9; ++$i)
         {
            $sum += $i * substr($bankAccountNr, (9 - $i), 1);
         }

         if (0 == $sum % 11)
         {
            return true;
         }
         else
         {
            $this->_error(self::INVALID_ACCOUNT_NO);
         }
      }
      else
      {
         $this->_error(self::INVALID_LENGTH);
      }
      return false;
   }
}

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