請問如何解決 Undefined index: pass in \includes\database.mysql.inc on $url['pass'] = urldecode($url['pass']);

$url = parse_url($url);

// Decode url-encoded information in the db connection string
$url['user'] = urldecode($url['user']);
$url['pass'] = urldecode($url['pass']);
$url['host'] = urldecode($url['host']);
$url['path'] = urldecode($url['path']);