Disable open_basedir for a domain in Plesk

1. Move to the conf directory of the domain

   cd /home/httpd/vhosts/domain.com/conf

2. Create a file called vhost.conf (or vhost_ssl.conf for https). Paste in the following three lines:

   
   php_admin_value open_basedir none
   

3. Lastly, rebuild the domain configs by running the following command:

   /usr/local/psa/admin/sbin/websrvmng -a -v