/**
  * this is to retrieve an array of Key values of a Property whose name starts similarly
  *
  * $arr = PropertyTable::getKeysLike('tax'); $arr = PropertyTable::getKeysLike('serie');
  * @author Leo
  **/
 public static function getKeysLike($key)
 {
     $arr = array();
     $c = new Criteria();
     $c->add(parent::KEY, '%' . $key . '_%', CRITERIA::LIKE);
     $obj = parent::doSelect($c);
     foreach ($obj as $o) {
         foreach ($o->getValue() as $vk => $vv) {
             $arr[$vk] = $vv;
         }
     }
     return $arr;
 }