public static function createInstance($instance_name = '_master', $server, $user, $pass, $db, $engine = 'mysql', $options = array(\PDO::ATTR_EMULATE_PREPARES => FALSE))
{
$class = get_called_class();
$obj = new $class($server, $user, $pass, $db, $engine, $options);
$obj->instance_name = $instance_name;
if (!isset(self::$instances[$class][$instance_name])) {
self::$instances[$class][$instance_name] = $obj;
if ($instance_name == '_master') {
self::$master_instance = $obj;
}
}
return $obj;
}
