Let’s think about a situation where you have a subdomain and you want it to be able to access files from the domain httpdocs directory. You cannot do that by default in Plesk, because of open_basedir. You can edit the httpd.include file in:
but that will only work until the next plesk restart or major modification.
But, the httpd.include file that manages a domain and subdomain explicitly...
By jessica, March 17, 2015