This is the legacy (v1) GeoIP PHP extension for PHP 7.x and PHP 8.x.

Unless you have old code that needs this, you might be better off using GeoIP2.

Installing:

Example for Debian (apt) and PHP 8.2

apt install php8.2-dev geoip-bin geoip-database libgeoip-dev
git clone https://github.com/rlerdorf/geoip.git geoip && cd geoip
phpize8.2
./configure 
make
make test
make install

To use it:

1. Add line extension=geoip.so to your (PHP 8.2) php.ini
2. Restart your webserver e.g. service apache2 restart
3. If using FPM: service php8.2-fpm restart