Someone

public function getNeighbours($limit = 10, $radius = 10, $culture = null)
{    
  if($culture === null)
  {
    $culture = sfContext::getInstance()->getUser()->getCulture();
  }
    
  $lat = $this->getLat();
  $lon = $this->getLon(); 
  $query = new Doctrine_Query();     
  $locations =  $query->select("l.*,(((ACOS(SIN(($lat*PI()/180)) * SIN((l.lat*pi()/180)) + COS(($lat*PI()/180)) * COS((l.lat*PI()/180)) * COS((($lon - l.lon)*PI()/180))))*180/PI())*60*1.1515) distance")          
  ->from('Location l , Location.LocationI18n i18n')
  ->limit($limit)
   // not current location
  ->where('l.id != ? AND i18n.culture = ?', array($this->getId(), $culture))
  ->having('distance < ?', $radius)
  ->execute();          
  return $locations;        
}