open_basedir restriction in effect and subdomains

Question

For security reasons I have put my yii folder below the html root, so my structure looks like this

/conf
/httpdocs
/httpsdocs
/yii

when running the site I get an error open_basedir restriction in effect that yii.php which is called by index.php out of httpdocs is not in the allowed path. Because this site is a subdomain do I edit the vhosts.conf of the main domain or of the subdomain?

What would the proper setting be to allow

/var/www/vhosts/example.com/subdomains/mysubdomain/yii 

Path to be accessible?

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EDIT

So my /var/www/vhosts/example.com/conf/vhost.conf file looks like this now:

AddHandler fcgid-script .php
<Directory /var/www/vhosts/example.com/httpdocs>
php_admin_value open_basedir ".:/var/www/vhosts/example.com/subdomains/mysubdomain/httpdocs:/tmp/:/var/www/vhosts/example.com/subdomains/mysubdomain/yii"
FCGIWrapper /var/www/vhosts/example.com/bin/php-cgi .php
Options +ExecCGI +FollowSymLinks
allow from all
</Directory>

I've reconfigured and restarted the web server but I still get the error:

Warning: require_once() [function.require-once]: open_basedir restriction in effect. 
File(/var/www/vhosts/example.com/subdomains/mysubdomain/httpdocs/../yii/yii.php) is not within the allowed path(s): 
(/var/www/vhosts/example.com/subdomains/mysubdomain/httpdocs:/tmp) 
in /var/www/vhosts/example.com/subdomains/mysubdomain/httpdocs/index.php on line 26

Answer 1

I found the answer. You have to specify the different modules or else simply editing the vhost file doens't have much of an effect. This is to turn off the open_basedir but you can edit the settings accordingly.

<Directory /var/www/vhosts/YOURDOMAIN.COM/subdomains/YOUSUBDOMAIN/httpdocs>
  <IfModule sapi_apache2.c>
  php_admin_value open_basedir none
</IfModule>
<IfModule mod_php5.c>
  php_admin_value open_basedir none
  </IfModule>
</Directory>

then

# /usr/local/psa/admin/bin/websrvmng --reconfigure-vhost --vhost-name=YOURDOMAIN.COM
# apachectl stop
# apachectl start

Full article can be found here: http://prattski.com/2008/09/13/plesk-open_basedir-fix/

Answer 2

In the virtualhost:

php_admin_value open_basedir ".:/var/www/vhosts/example.com/subdomains/mysubdomain/httpdocs:/my/own/tmp:/var/www/vhosts/example.com/subdomains/mysubdomain/yii"