Symfony project on CPanel account
I just copy everything out of web/ (including css/, js/, etc. subfolders) one level higher, then edit the index.php/yourapp_dev.php files' require statements to reflect the change in path. Add some rewrite rules to forbid direct access to the rest of the directories and you're all set on servers where you can't change the document root.
If you look at the http.conf virtual host entry for the symfony project the last line in generally a commented out include statement. If you uncomment that line you add any extra virtual host configs you need into that file. Then just restart apache. Anything in the file will then be appended in place of the include statement.