After I upgraded my PHP to version 7.4.0RC4 and phpMyAdmin to version 4.9.1, there is a Notice of "Undefined offset" every time I open phpMyadmin. (see the screenshot below)
The line 379 in the index.php (as referred to by the Notice) is:
echo ' ' , $charsets[$charset], ' (' . $charset, ')';
The issue is obviously charset, and that corresponds with the missing output of "Server charset" as shown in the screenshot.
After a bit searching, I tried adding some suggested configuration into my MySQL config file (my.ini) and restart my database server, but the issue persists.