breaks swfobject and gzip outside basedir

Drupal core optimize javascript also breaks swfobject, so thats one down. But its still strange the gzip function tries to put files outside server root.

I was able to solve the problem by changing:

        if (!file_exists($jsmin_file .'.gz')) {
          file_save_data(gzencode($contents, 9), $jsmin_file .'.gz', FILE_EXISTS_REPLACE);
        }

to

        if (!file_exists($_SERVER['DOCUMENT_ROOT'] . $path . $jsmin_file .'.gz')) {
          file_save_data(gzencode($contents, 9), $_SERVER['DOCUMENT_ROOT'] . $path . $jsmin_file .'.gz', FILE_EXISTS_REPLACE);
        }

So by adding $_SERVER['DOCUMENT_ROOT'] . $path in front of $jsmin_file. That seems to be necessary to get the real absolute path to the files. Otherwise I get drupal error messages about open basedir restrictions (because '/js/' is outside the server root, it should be '/var/www/vhosts/xxx.com/httpdocs/sites/default/files/js').

Anyone know why? Is it only me? Strange stuff. Because it does work with the errors, js files are put in the right place. So why the error messages?