Database::closeConnection

public static Database::closeConnection($target = NULL, $key = NULL)

public static function closeConnection($target = NULL, $key = NULL) {
  // Gets the active connection by default.
  if (!isset($key)) {
    $key = self::$activeKey;
  }
  // To close a connection, it needs to be set to NULL and removed from the
  // static variable. In all cases, closeConnection() might be called for a
  // connection that was not opened yet, in which case the key is not defined
  // yet and we just ensure that the connection key is undefined.
  if (isset($target)) {
    if (isset(self::$connections[$key][$target])) {
      self::$connections[$key][$target]->destroy();
      self::$connections[$key][$target] = NULL;
    }
    unset(self::$connections[$key][$target]);
  }
  else {
    if (isset(self::$connections[$key])) {
      foreach (self::$connections[$key] as $target => $connection) {
        self::$connections[$key][$target]->destroy();
        self::$connections[$key][$target] = NULL;
      }
    }
    unset(self::$connections[$key]);
  }
}