coopster - 1:44 pm on Sep 24, 2012 (gmt 0)
You need to add that path to your Apache configuration. HOWEVER! The "httpdocs" is likely already set as your root path (this looks like a Plesk configuration) so you probably will NOT want to be dropping included files in that lower level directory. You are better off creating a new directory and adding THAT to your open_basedir path. Something along these lines ...
php_admin_flag engine on
php_admin_value open_basedir "/var/www/vhosts/@domain_name@/httpdocs/:/tmp/:/var/www/vhosts/@domain_name@/my_includes/"
Don't forget to restart the HTTP server for the configuration directives to take effect.