public static function &get_instance() { if (!self::$instance) { self::$instance = new self(); } return self::$instance; }
public function get_days($start_timestamp, $end_timestamp, $flag = 0) { $dao = DB_PMTDataObject::get_instance(); $sql = "select * from calendar where timestamp >= " . $start_timestamp . " and timestamp <= " . $end_timestamp . " and is_valid=" . $flag; $ret = $dao->query($sql, null); return $ret ? $ret : false; }