Prevent direct access to php files

Hello
You should prevent direct access to the php files that are librariries/include files :
https://www.barrykooij.com/prevent-direct-file-access-plugin-files/

That will prevent at least error in logs like this :
PHP Fatal error: Call to undefined function add_action() in …./wp-content/plugins/wp-useronline/scb/load.php on line 39
when someone go the file /wp-content/plugins/wp-useronline/wp-useronline.php (or any other file).

In worse case, it could lead to vulnerabilities to let people execute file like this