cgi.fix_pathinfo is only in effect when PHP is compiled as a CGI; as you're on a VPS I highly doubt this is the case so it should not work.

The path info variable itself will be blank until a path is posted to a script.

As said, you have to update the options for the site's config to ether:
1. Have AcceptPathInfo On
2. Have AllowOverride All and a entry for AcceptPathInfo On in a .htaccess file in that sites webroot.

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