GenericHelper.php

<?php

function link_to_current($title, $params = array(), $options = array())
{
  $currentRoute = sfContext::getInstance()->getRouting()->getCurrentRouteName();
  
  $currentParams = sfContext::getInstance()->getRequest()->getParameterHolder()->getAll();

  unset($currentParams['module'], $currentParams['action']);
  
  $params = array_merge($currentParams, $params);
  
  if (isset($options['query_string'])) 
  {
    parse_str($options['query_string'], $extraParams);

    $params = array_merge($params, $extraParams);
    
    unset($options['query_string']);
  }

  $currentRoute = sprintf('@%s?%s', $currentRoute, http_build_query($params));
  
  return link_to1($title, $currentRoute, $options);
}