Hey there! Here is a working demo I just wrote implementing dismissable notices!
https://github.com/webmarka/show-notice-or-message-on-admin-are
Feel free to re-fork or take the idea in it!
Just found another interesting solution provided by the library “WordPress Dismissible Notices Handler” which could be integrated instead :
https://github.com/julien731/WP-Dismissible-Notices-Handler
Now, let’s notify!!
Hi again, I decided to create a brand new plugin to manage custom Admin Notices. My needs was to be able to display notices to targeted users roles and of course, enable them to permanently dismiss a notice after it’s read. And being able to keep track of which notices has been made.
This is a tool to help WP websites management, so I added some cool functions like Send Email, Show/hide Notices titles and full-HTML support, possibility to activate comments, add tags, choose one of the 4 built-in WP admin notices colors. To keep track of the context when a notice was sent, some installation infos are kept alongside with the notice, eg: installed plugins list and versions, installed theme and version, etc.
It’s available now on WP.org here if you want to give a try: KJM Admin Notices