Show list of drop-ins and must-use plugins in admin area

[archon810]

Stemming from #10952, this ticket is a suggestion to add a warning somewhere in admin when a custom object-cache.php and/or db.php are present.

Malfunctions related to having those files can be very tricky to trace and debug, as evident from #10952.

Specifically, see http://core.trac.wordpress.org/ticket/10952#comment:19 for dd32's support for adding this warning.

+1, and also must use plugins as well.

I'm thinking these should be two page filters on the Manage Plugins page, "Must-Use Plugins" and "Drop-ins" (could possibly be one page) that would only appear if you have any mu plugins or drop-ins.

Drop-ins also include maintenance.php and advanced-cache.php, bringing the total to four.

Many of these files won't have headers. But for a drop-in, existence is a big start. And including a way for super admins to see mu plugins will only serve to encourage them to use headers on those.

I'm going to try to do a patch for this later this week. Possibly try it out as a plugin as well.

Just to repeat my +1

I'd be +1 for either a section on the plugin page Or a Menu item under Tools which lists (for !multisite

is_super_admin) MU-style plugins, and any override files which were present..

In the event that the file doesnt have headers, I'd list it simply as a table row with the filename.. and the description of what that file achieves.

Future release pending patch and/or core developer feedback

(for !multisite is_super_admin)

By that i meant:

(for !multisite || is_super_admin)

|| got eaten as a table?