PHP安裝GeoIP擴展根據IP獲取訪客所在國家/城市/經緯度等信息

http://php.net/manual/zh/ref.geoip.php
sudo apt-get install libgeoip-dev
pecl install geoip-1.1.0 注意:Beta版要指定版本號.若是是apt安裝的PHP,直接安裝php5-geoip這個包便可.
php.ini中加入:
extension=geoip.so
geoip.custom_directory="/usr/share/GeoIP"

免費下載GeoLiteCity數據庫(解壓後18MB):
http://dev.maxmind.com/geoip/legacy/install/city/
wget http://geolite.maxmind.com/download/geoip/database/GeoLiteCity.dat.gz
gunzip GeoLiteCity.dat.gz
sudo mkdir -v /usr/share/GeoIP
sudo mv -v GeoLiteCity.dat /usr/share/GeoIP/GeoIPCity.dat

測試:
php -a
<?php
print_r(geoip_record_by_name('106.37.165.80')); 回車後按Ctrl+D運行
Array
(
    [continent_code] => AS
    [country_code] => CN
    [country_code3] => CHN
    [country_name] => China //國家
    [region] => 22
    [city] => Beijing //城市
    [postal_code] =>
    [latitude] => 39.928901672363 //緯度
    [longitude] => 116.38829803467 //經度
    [dma_code] => 0
    [area_code] => 0
)

在命令行用geoiplookup查看IP信息:
traceroute www.oschina.net 可見IP地址 61.145.122.155
sudo apt-get install geoip-bin geoip-database
geoiplookup 61.145.122.155 -f /usr/share/GeoIP/GeoIP.dat
GeoIP Country Edition: CN, China
geoip-database提供的GeoIP.dat只能精確到國家.

geoiplookup 61.145.122.155 -f /usr/share/GeoIP/GeoIPCity.dat
GeoIP City Edition, Rev 1: CN, 30, Guangdong, Guangzhou, N/A, 23.116699, 113.250000, 0, 0
從maxmind官網下的數據庫GeoLiteCity則信息更詳細.

geoiplookup 61.145.122.155 則同時顯示上述兩個數據庫的信息.

補充:
PHP輕鬆實現"附近的人"功能,根據IP肯定經緯度,根據經緯度計算距離