The absolute path to MaxMind GeoLite2 database file for IPv4 and IPv6.
The filter hook “ip-geo-block-geolite2-path” assigns the absolute path to the installed GeoLite2 Free Downloadable Database file.
If you’d like to use GeoLite2 City database, put the following code snippet
functions.php in your theme.
"mu-plugins" (ip-geo-block-mu.php)as Validation timing , you should put your code snippet into
drop-in.phpin Geolocation API folder instead of
functions.php. See My custom functions in “functions.php” doesn’t work. in FAQ for detail.