(PECL geoip >= 1.0.3)
geoip_continent_code_by_name — Get the two letter continent code
$hostname
   )The geoip_continent_code_by_name() function will return the two letter continent code corresponding to a hostname or an IP address.
hostname
     The hostname or IP address whose location is to be looked-up.
   Returns the two letter continent code on success, or FALSE if the
   address cannot be found in the database.
  
Example #1 A geoip_continent_code_by_name() example
This will print where the host example.com is located.
<?php
$continent = geoip_continent_code_by_name('www.example.com');
if ($continent) {
    echo 'This host is located in: ' . $continent;
}
?>
以上例程会输出:
This host is located in: NA