$config->paths->root incorrect

[neonwired]

I'm using $config->paths->root to get the root domain of my site. It worked fine in my local dev environment but on my live server it returns '/var/www' rather than the actual directory '/var/www/my-site' . I'm pretty sure i've used it before with virtual domains so not sure what the issue is.

[dragan]

It works here (Apache) as expected. You could use regular PHP instead: 

echo $_SERVER['DOCUMENT_ROOT'] . dirname($_SERVER['SCRIPT_NAME']) . '/';