I'm trying to add an admin alert that reminds the user to install a certain plugin in case it is missing. I have found a way to generally add an alert box:
How do I only make it appear if the plugin is missing? I was thinking about something in the lines of
<?php if ( function_exists('...') ) ?> but I am not too sure.
I also need a way of adding a link to the plugin and a link to dismiss the box.