I’m surprised the include_path is not automatically included.
Your options seem to be to remove the open_basedir restriction, or to add the include_path to the open_basedir restriction. It is a tradeoff of simplicity or security.
Try restarting your database server (probably mysql?) to see if that resolves the “Database connection failed!” message. If it does not, open that question in a new posting so as to keep things organized in the forum.
I have put open_basedir = none is couple ini, but the php check still reads /var/www/vhosts/koyauniversity.org/:/tmp/ I do not know where this value come from, I think all rebooting of server has damaged our server as well.
Why would a plug in require TAR and not ZIP, I think OJS requires higher ends IT people to make use of it, and basic user like us will always have problem.
We have just been listed by Thomson Reuters and we are trying to fill the indexing requirement, but we got into these issues and spend ages to solve them with no success,