/**
* почти конструктор
* @param null|int|string $type
* @param null|string $host
* @param null|string $base
* @param null|string $user
* @param null|string $pwd
* @return connect|null
*/
public static function start($type = NULL, $host = NULL, $base = NULL, $user = NULL, $pwd = NULL)
{
if (self::$inst == null) {
self::$inst = new connect($type, $host, $base, $user, $pwd);
}
return self::$inst;
}