The geoip_region_by_name function will return the country and region corresponding to a hostname or an IP address.
This function is currently only available to users who have bought a commercial GeoIP Region Edition. A warning will be issued if the proper database cannot be located.
The names of the different keys of the returning associative array are as follows:
"country_code" -- Two letter country code (see geoip_country_code_by_name)
"region" -- The region code (ex: CA for California)
The hostname or IP address whose region is to be looked-up.
Returns the associative array on success, or false if the address cannot be found in the database.