root/trunk/apps/main/lib/sfBlacklistValidator.class.php

<?php
class sfBlacklistValidator extends sfValidator
{

  public function initialize($context, $parameters = null)
  {
    // initialize parent
    parent::initialize($context);

    // set defaults
    $this->getParameterHolder()->set('blacklist_error', 'Value is not an allowed one');
    $this->getParameterHolder()->set('case_sensitive', false);
    $this->getParameterHolder()->set('trim', true);
    $this->getParameterHolder()->add($parameters);
    return true;
  }

  public function execute(&$value, &$error)
  {
    // Forbidden names
    $blacklist = $this->getParameter('blacklist');
    $casesensitive = $this->getParameter('case_sensitive');
    $trim = $this->getParameter('trim');
    
    if ($trim)
    {
      $value = trim($value);
    }
    
    if (is_array($blacklist) && count($blacklist) > 0)
    {
      if ($casesensitive)
      {
        $match = in_array($value, $blacklist);
      }
      else
      {
        $match = false;
        foreach ($blacklist as $item)
        {
          if (is_string($item) && strtolower($item) == strtolower($value))
          {
            $match = true;
            break;
          }
        }
      }
      if ($match)
      {
        $error = $this->getParameterHolder()->get('blacklist_error');
        return false;
      }
    }
    
    return true;
  }
  
}