php通过ip获取国家代码

首先我们需要数据信息，所以先获取一个免费的数据库：http://sjolzy.cn/php/GeoIP/bak/GeoIP.dat.gz ，接着解压得到：GeoIP.dat，然后就是对数据文件的按需操作，这边范例使用的是PHP。

调用代码：
[code lang=”php”]
include("geoip.inc.php");

// 打开数据文件
$gi = geoip_open("GeoIP.dat",GEOIP_STANDARD);

// 获取国家代码
$country_code = geoip_country_code_by_addr($gi, $_SERVER[‘REMOTE_ADDR’]);
echo "Your country code is: $country_code ";

// 获取国家名称
$country_name = geoip_country_name_by_addr($gi, $_SERVER[‘REMOTE_ADDR’]);
echo "Your country name is: $country_name ";

// 关闭文件
geoip_close($gi);
[/code]

上面包含文件的代码如下：
[code lang=”php”]
<?php

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 2 -*- */
/* geoip.inc
*
* Copyright (C) 2007 MaxMind LLC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

define("GEOIP_COUNTRY_BEGIN", 16776960);
define("GEOIP_STATE_BEGIN_REV0", 16700000);
define("GEOIP_STATE_BEGIN_REV1", 16000000);
define("GEOIP_STANDARD", 0);
define("GEOIP_MEMORY_CACHE", 1);
define("GEOIP_SHARED_MEMORY", 2);
define("STRUCTURE_INFO_MAX_SIZE", 20);
define("DATABASE_INFO_MAX_SIZE", 100);
define("GEOIP_COUNTRY_EDITION", 106);
define("GEOIP_PROXY_EDITION", 8);
define("GEOIP_ASNUM_EDITION", 9);
define("GEOIP_NETSPEED_EDITION", 10);
define("GEOIP_REGION_EDITION_REV0", 112);
define("GEOIP_REGION_EDITION_REV1", 3);
define("GEOIP_CITY_EDITION_REV0", 111);
define("GEOIP_CITY_EDITION_REV1", 2);
define("GEOIP_ORG_EDITION", 110);
define("GEOIP_ISP_EDITION", 4);
define("SEGMENT_RECORD_LENGTH", 3);
define("STANDARD_RECORD_LENGTH", 3);
define("ORG_RECORD_LENGTH", 4);
define("MAX_RECORD_LENGTH", 4);
define("MAX_ORG_RECORD_LENGTH", 300);
define("GEOIP_SHM_KEY", 0x4f415401);
define("US_OFFSET", 1);
define("CANADA_OFFSET", 677);
define("WORLD_OFFSET", 1353);
define("FIPS_RANGE", 360);
define("GEOIP_UNKNOWN_SPEED", 0);
define("GEOIP_DIALUP_SPEED", 1);
define("GEOIP_CABLEDSL_SPEED", 2);
define("GEOIP_CORPORATE_SPEED", 3);

class GeoIP {
var $flags;
var $filehandle;
var $memory_buffer;
var $databaseType;
var $databaseSegments;
var $record_length;
var $shmid;
var $GEOIP_COUNTRY_CODE_TO_NUMBER = array(
"" => 0, "AP" => 1, "EU" => 2, "AD" => 3, "AE" => 4, "AF" => 5,
"AG" => 6, "AI" => 7, "AL" => 8, "AM" => 9, "AN" => 10, "AO" => 11,
"AQ" => 12, "AR" => 13, "AS" => 14, "AT" => 15, "AU" => 16, "AW" => 17,
"AZ" => 18, "BA" => 19, "BB" => 20, "BD" => 21, "BE" => 22, "BF" => 23,
"BG" => 24, "BH" => 25, "BI" => 26, "BJ" => 27, "BM" => 28, "BN" => 29,
"BO" => 30, "BR" => 31, "BS" => 32, "BT" => 33, "BV" => 34, "BW" => 35,
"BY" => 36, "BZ" => 37, "CA" => 38, "CC" => 39, "CD" => 40, "CF" => 41,
"CG" => 42, "CH" => 43, "CI" => 44, "CK" => 45, "CL" => 46, "CM" => 47,
"CN" => 48, "CO" => 49, "CR" => 50, "CU" => 51, "CV" => 52, "CX" => 53,
"CY" => 54, "CZ" => 55, "DE" => 56, "DJ" => 57, "DK" => 58, "DM" => 59,
"DO" => 60, "DZ" => 61, "EC" => 62, "EE" => 63, "EG" => 64, "EH" => 65,
"ER" => 66, "ES" => 67, "ET" => 68, "FI" => 69, "FJ" => 70, "FK" => 71,
"FM" => 72, "FO" => 73, "FR" => 74, "FX" => 75, "GA" => 76, "GB" => 77,
"GD" => 78, "GE" => 79, "GF" => 80, "GH" => 81, "GI" => 82, "GL" => 83,
"GM" => 84, "GN" => 85, "GP" => 86, "GQ" => 87, "GR" => 88, "GS" => 89,
"GT" => 90, "GU" => 91, "GW" => 92, "GY" => 93, "HK" => 94, "HM" => 95,
"HN" => 96, "HR" => 97, "HT" => 98, "HU" => 99, "ID" => 100, "IE" => 101,
"IL" => 102, "IN" => 103, "IO" => 104, "IQ" => 105, "IR" => 106, "IS" => 107,
"IT" => 108, "JM" => 109, "JO" => 110, "JP" => 111, "KE" => 112, "KG" => 113,
"KH" => 114, "KI" => 115, "KM" => 116, "KN" => 117, "KP" => 118, "KR" => 119,
"KW" => 120, "KY" => 121, "KZ" => 122, "LA" => 123, "LB" => 124, "LC" => 125,
"LI" => 126, "LK" => 127, "LR" => 128, "LS" => 129, "LT" => 130, "LU" => 131,
"LV" => 132, "LY" => 133, "MA" => 134, "MC" => 135, "MD" => 136, "MG" => 137,
"MH" => 138, "MK" => 139, "ML" => 140, "MM" => 141, "MN" => 142, "MO" => 143,
"MP" => 144, "MQ" => 145, "MR" => 146, "MS" => 147, "MT" => 148, "MU" => 149,
"MV" => 150, "MW" => 151, "MX" => 152, "MY" => 153, "MZ" => 154, "NA" => 155,
"NC" => 156, "NE" => 157, "NF" => 158, "NG" => 159, "NI" => 160, "NL" => 161,
"NO" => 162, "NP" => 163, "NR" => 164, "NU" => 165, "NZ" => 166, "OM" => 167,
"PA" => 168, "PE" => 169, "PF" => 170, "PG" => 171, "PH" => 172, "PK" => 173,
"PL" => 174, "PM" => 175, "PN" => 176, "PR" => 177, "PS" => 178, "PT" => 179,
"PW" => 180, "PY" => 181, "QA" => 182, "RE" => 183, "RO" => 184, "RU" => 185,
"RW" => 186, "SA" => 187, "SB" => 188, "SC" => 189, "SD" => 190, "SE" => 191,
"SG" => 192, "SH" => 193, "SI" => 194, "SJ" => 195, "SK" => 196, "SL" => 197,
"SM" => 198, "SN" => 199, "SO" => 200, "SR" => 201, "ST" => 202, "SV" => 203,
"SY" => 204, "SZ" => 205, "TC" => 206, "TD" => 207, "TF" => 208, "TG" => 209,
"TH" => 210, "TJ" => 211, "TK" => 212, "TM" => 213, "TN" => 214, "TO" => 215,
"TL" => 216, "TR" => 217, "TT" => 218, "TV" => 219, "TW" => 220, "TZ" => 221,
"UA" => 222, "UG" => 223, "UM" => 224, "US" => 225, "UY" => 226, "UZ" => 227,
"VA" => 228, "VC" => 229, "VE" => 230, "VG" => 231, "VI" => 232, "VN" => 233,
"VU" => 234, "WF" => 235, "WS" => 236, "YE" => 237, "YT" => 238, "RS" => 239,
"ZA" => 240, "ZM" => 241, "ME" => 242, "ZW" => 243, "A1" => 244, "A2" => 245,
"O1" => 246, "AX" => 247, "GG" => 248, "IM" => 249, "JE" => 250, "BL" => 251,
"MF" => 252
);
var $GEOIP_COUNTRY_CODES = array(
"", "AP", "EU", "AD", "AE", "AF", "AG", "AI", "AL", "AM", "AN", "AO", "AQ",
"AR", "AS", "AT", "AU", "AW", "AZ", "BA", "BB", "BD", "BE", "BF", "BG", "BH",
"BI", "BJ", "BM", "BN", "BO", "BR", "BS", "BT", "BV", "BW", "BY", "BZ", "CA",
"CC", "CD", "CF", "CG", "CH", "CI", "CK", "CL", "CM", "CN", "CO", "CR", "CU",
"CV", "CX", "CY", "CZ", "DE", "DJ", "DK", "DM", "DO", "DZ", "EC", "EE", "EG",
"EH", "ER", "ES", "ET", "FI", "FJ", "FK", "FM", "FO", "FR", "FX", "GA", "GB",
"GD", "GE", "GF", "GH", "GI", "GL", "GM", "GN", "GP", "GQ", "GR", "GS", "GT",
"GU", "GW", "GY", "HK", "HM", "HN", "HR", "HT", "HU", "ID", "IE", "IL", "IN",
"IO", "IQ", "IR", "IS", "IT", "JM", "JO", "JP", "KE", "KG", "KH", "KI", "KM",
"KN", "KP", "KR", "KW", "KY", "KZ", "LA", "LB", "LC", "LI", "LK", "LR", "LS",
"LT", "LU", "LV", "LY", "MA", "MC", "MD", "MG", "MH", "MK", "ML", "MM", "MN",
"MO", "MP", "MQ", "MR", "MS", "MT", "MU", "MV", "MW", "MX", "MY", "MZ", "NA",
"NC", "NE", "NF", "NG", "NI", "NL", "NO", "NP", "NR", "NU", "NZ", "OM", "PA",
"PE", "PF", "PG", "PH", "PK", "PL", "PM", "PN", "PR", "PS", "PT", "PW", "PY",
"QA", "RE", "RO", "RU", "RW", "SA", "SB", "SC", "SD", "SE", "SG", "SH", "SI",
"SJ", "SK", "SL", "SM", "SN", "SO", "SR", "ST", "SV", "SY", "SZ", "TC", "TD",
"TF", "TG", "TH", "TJ", "TK", "TM", "TN", "TO", "TL", "TR", "TT", "TV", "TW",
"TZ", "UA", "UG", "UM", "US", "UY", "UZ", "VA", "VC", "VE", "VG", "VI", "VN",
"VU", "WF", "WS", "YE", "YT", "RS", "ZA", "ZM", "ME", "ZW", "A1", "A2", "O1",
"AX", "GG", "IM", "JE", "BL", "MF"
);
var $GEOIP_COUNTRY_CODES3 = array(
"","AP","EU","AND","ARE","AFG","ATG","AIA","ALB","ARM","ANT","AGO","AQ","ARG",
"ASM","AUT","AUS","ABW","AZE","BIH","BRB","BGD","BEL","BFA","BGR","BHR","BDI",
"BEN","BMU","BRN","BOL","BRA","BHS","BTN","BV","BWA","BLR","BLZ","CAN","CC",
"COD","CAF","COG","CHE","CIV","COK","CHL","CMR","CHN","COL","CRI","CUB","CPV",
"CX","CYP","CZE","DEU","DJI","DNK","DMA","DOM","DZA","ECU","EST","EGY","ESH",
"ERI","ESP","ETH","FIN","FJI","FLK","FSM","FRO","FRA","FX","GAB","GBR","GRD",
"GEO","GUF","GHA","GIB","GRL","GMB","GIN","GLP","GNQ","GRC","GS","GTM","GUM",
"GNB","GUY","HKG","HM","HND","HRV","HTI","HUN","IDN","IRL","ISR","IND","IO",
"IRQ","IRN","ISL","ITA","JAM","JOR","JPN","KEN","KGZ","KHM","KIR","COM","KNA",
"PRK","KOR","KWT","CYM","KAZ","LAO","LBN","LCA","LIE","LKA","LBR","LSO","LTU",
"LUX","LVA","LBY","MAR","MCO","MDA","MDG","MHL","MKD","MLI","MMR","MNG","MAC",
"MNP","MTQ","MRT","MSR","MLT","MUS","MDV","MWI","MEX","MYS","MOZ","NAM","NCL",
"NER","NFK","NGA","NIC","NLD","NOR","NPL","NRU","NIU","NZL","OMN","PAN","PER",
"PYF","PNG","PHL","PAK","POL","SPM","PCN","PRI","PSE","PRT","PLW","PRY","QAT",
"REU","ROU","RUS","RWA","SAU","SLB","SYC","SDN","SWE","SGP","SHN","SVN","SJM",
"SVK","SLE","SMR","SEN","SOM","SUR","STP","SLV","SYR","SWZ","TCA","TCD","TF",
"TGO","THA","TJK","TKL","TLS","TKM","TUN","TON","TUR","TTO","TUV","TWN","TZA",
"UKR","UGA","UM","USA","URY","UZB","VAT","VCT","VEN","VGB","VIR","VNM","VUT",
"WLF","WSM","YEM","YT","SRB","ZAF","ZMB","MNE","ZWE","A1","A2","O1",
"ALA","GGY","IMN","JEY","BLM","MAF"
);
var $GEOIP_COUNTRY_NAMES = array(
"", "Asia/Pacific Region", "Europe", "Andorra", "United Arab Emirates",
"Afghanistan", "Antigua and Barbuda", "Anguilla", "Albania", "Armenia",
"Netherlands Antilles", "Angola", "Antarctica", "Argentina", "American Samoa",
"Austria", "Australia", "Aruba", "Azerbaijan", "Bosnia and Herzegovina",
"Barbados", "Bangladesh", "Belgium", "Burkina Faso", "Bulgaria", "Bahrain",
"Burundi", "Benin", "Bermuda", "Brunei Darussalam", "Bolivia", "Brazil",
"Bahamas", "Bhutan", "Bouvet Island", "Botswana", "Belarus", "Belize",
"Canada", "Cocos (Keeling) Islands", "Congo, The Democratic Republic of the",
"Central African Republic", "Congo", "Switzerland", "Cote D’Ivoire", "Cook Islands",
"Chile", "Cameroon", "China", "Colombia", "Costa Rica", "Cuba", "Cape Verde",
"Christmas Island", "Cyprus", "Czech Republic", "Germany", "Djibouti",
"Denmark", "Dominica", "Dominican Republic", "Algeria", "Ecuador", "Estonia",
"Egypt", "Western Sahara", "Eritrea", "Spain", "Ethiopia", "Finland", "Fiji",
"Falkland Islands (Malvinas)", "Micronesia, Federated States of", "Faroe Islands",
"France", "France, Metropolitan", "Gabon", "United Kingdom",
"Grenada", "Georgia", "French Guiana", "Ghana", "Gibraltar", "Greenland",
"Gambia", "Guinea", "Guadeloupe", "Equatorial Guinea", "Greece", "South Georgia and the South Sandwich Islands",
"Guatemala", "Guam", "Guinea-Bissau",
"Guyana", "Hong Kong", "Heard Island and McDonald Islands", "Honduras",
"Croatia", "Haiti", "Hungary", "Indonesia", "Ireland", "Israel", "India",
"British Indian Ocean Territory", "Iraq", "Iran, Islamic Republic of",
"Iceland", "Italy", "Jamaica", "Jordan", "Japan", "Kenya", "Kyrgyzstan",
"Cambodia", "Kiribati", "Comoros", "Saint Kitts and Nevis", "Korea, Democratic People’s Republic of",
"Korea, Republic of", "Kuwait", "Cayman Islands",
"Kazakhstan", "Lao People’s Democratic Republic", "Lebanon", "Saint Lucia",
"Liechtenstein", "Sri Lanka", "Liberia", "Lesotho", "Lithuania", "Luxembourg",
"Latvia", "Libyan Arab Jamahiriya", "Morocco", "Monaco", "Moldova, Republic of",
"Madagascar", "Marshall Islands", "Macedonia",
"Mali", "Myanmar", "Mongolia", "Macau", "Northern Mariana Islands",
"Martinique", "Mauritania", "Montserrat", "Malta", "Mauritius", "Maldives",
"Malawi", "Mexico", "Malaysia", "Mozambique", "Namibia", "New Caledonia",
"Niger", "Norfolk Island", "Nigeria", "Nicaragua", "Netherlands", "Norway",
"Nepal", "Nauru", "Niue", "New Zealand", "Oman", "Panama", "Peru", "French Polynesia",
"Papua New Guinea", "Philippines", "Pakistan", "Poland", "Saint Pierre and Miquelon",
"Pitcairn Islands", "Puerto Rico", "Palestinian Territory",
"Portugal", "Palau", "Paraguay", "Qatar", "Reunion", "Romania",
"Russian Federation", "Rwanda", "Saudi Arabia", "Solomon Islands",
"Seychelles", "Sudan", "Sweden", "Singapore", "Saint Helena", "Slovenia",
"Svalbard and Jan Mayen", "Slovakia", "Sierra Leone", "San Marino", "Senegal",
"Somalia", "Suriname", "Sao Tome and Principe", "El Salvador", "Syrian Arab Republic",
"Swaziland", "Turks and Caicos Islands", "Chad", "French Southern Territories",
"Togo", "Thailand", "Tajikistan", "Tokelau", "Turkmenistan",
"Tunisia", "Tonga", "Timor-Leste", "Turkey", "Trinidad and Tobago", "Tuvalu",
"Taiwan", "Tanzania, United Republic of", "Ukraine",
"Uganda", "United States Minor Outlying Islands", "United States", "Uruguay",
"Uzbekistan", "Holy See (Vatican City State)", "Saint Vincent and the Grenadines",
"Venezuela", "Virgin Islands, British", "Virgin Islands, U.S.",
"Vietnam", "Vanuatu", "Wallis and Futuna", "Samoa", "Yemen", "Mayotte",
"Serbia", "South Africa", "Zambia", "Montenegro", "Zimbabwe",
"Anonymous Proxy","Satellite Provider","Other",
"Aland Islands","Guernsey","Isle of Man","Jersey","Saint Barthelemy","Saint Martin"
);

var $GEOIP_CONTINENT_CODES = array(
"–", "AS", "EU", "EU", "AS", "AS", "SA", "SA", "EU", "AS",
"SA", "AF", "AN", "SA", "OC", "EU", "OC", "SA", "AS", "EU",
"SA", "AS", "EU", "AF", "EU", "AS", "AF", "AF", "SA", "AS",
"SA", "SA", "SA", "AS", "AF", "AF", "EU", "SA", "NA", "AS",
"AF", "AF", "AF", "EU", "AF", "OC", "SA", "AF", "AS", "SA",
"SA", "SA", "AF", "AS", "AS", "EU", "EU", "AF", "EU", "SA",
"SA", "AF", "SA", "EU", "AF", "AF", "AF", "EU", "AF", "EU",
"OC", "SA", "OC", "EU", "EU", "EU", "AF", "EU", "SA", "AS",
"SA", "AF", "EU", "SA", "AF", "AF", "SA", "AF", "EU", "SA",
"SA", "OC", "AF", "SA", "AS", "AF", "SA", "EU", "SA", "EU",
"AS", "EU", "AS", "AS", "AS", "AS", "AS", "EU", "EU", "SA",
"AS", "AS", "AF", "AS", "AS", "OC", "AF", "SA", "AS", "AS",
"AS", "SA", "AS", "AS", "AS", "SA", "EU", "AS", "AF", "AF",
"EU", "EU", "EU", "AF", "AF", "EU", "EU", "AF", "OC", "EU",
"AF", "AS", "AS", "AS", "OC", "SA", "AF", "SA", "EU", "AF",
"AS", "AF", "NA", "AS", "AF", "AF", "OC", "AF", "OC", "AF",
"SA", "EU", "EU", "AS", "OC", "OC", "OC", "AS", "SA", "SA",
"OC", "OC", "AS", "AS", "EU", "SA", "OC", "SA", "AS", "EU",
"OC", "SA", "AS", "AF", "EU", "AS", "AF", "AS", "OC", "AF",
"AF", "EU", "AS", "AF", "EU", "EU", "EU", "AF", "EU", "AF",
"AF", "SA", "AF", "SA", "AS", "AF", "SA", "AF", "AF", "AF",
"AS", "AS", "OC", "AS", "AF", "OC", "AS", "EU", "SA", "OC",
"AS", "AF", "EU", "AF", "OC", "NA", "SA", "AS", "EU", "SA",
"SA", "SA", "SA", "AS", "OC", "OC", "OC", "AS", "AF", "EU",
"AF", "AF", "EU", "AF", "–", "–", "–", "EU", "EU", "EU",
"EU", "SA", "SA" );

}
function geoip_load_shared_mem ($file) {

$fp = fopen($file, "rb");
if (!$fp) {
print "error opening $file: $php_errormsg\n";
exit;
}
$s_array = fstat($fp);
$size = $s_array[‘size’];
if ($shmid = @shmop_open (GEOIP_SHM_KEY, "w", 0, 0)) {
shmop_delete ($shmid);
shmop_close ($shmid);
}
$shmid = shmop_open (GEOIP_SHM_KEY, "c", 0644, $size);
shmop_write ($shmid, fread($fp, $size), 0);
shmop_close ($shmid);
}

function _setup_segments($gi){
$gi->databaseType = GEOIP_COUNTRY_EDITION;
$gi->record_length = STANDARD_RECORD_LENGTH;
if ($gi->flags & GEOIP_SHARED_MEMORY) {
$offset = @shmop_size ($gi->shmid) – 3;
for ($i = 0; $i < STRUCTURE_INFO_MAX_SIZE; $i++) {
$delim = @shmop_read ($gi->shmid, $offset, 3);
$offset += 3;
if ($delim == (chr(255).chr(255).chr(255))) {
$gi->databaseType = ord(@shmop_read ($gi->shmid, $offset, 1));
$offset++;

if ($gi->databaseType == GEOIP_REGION_EDITION_REV0){
$gi->databaseSegments = GEOIP_STATE_BEGIN_REV0;
} else if ($gi->databaseType == GEOIP_REGION_EDITION_REV1){
$gi->databaseSegments = GEOIP_STATE_BEGIN_REV1;
} else if (($gi->databaseType == GEOIP_CITY_EDITION_REV0)||
($gi->databaseType == GEOIP_CITY_EDITION_REV1)
|| ($gi->databaseType == GEOIP_ORG_EDITION)
|| ($gi->databaseType == GEOIP_ISP_EDITION)
|| ($gi->databaseType == GEOIP_ASNUM_EDITION)){
$gi->databaseSegments = 0;
$buf = @shmop_read ($gi->shmid, $offset, SEGMENT_RECORD_LENGTH);
for ($j = 0;$j < SEGMENT_RECORD_LENGTH;$j++){
$gi->databaseSegments += (ord($buf[$j]) << ($j * 8));
}
if (($gi->databaseType == GEOIP_ORG_EDITION)||
($gi->databaseType == GEOIP_ISP_EDITION)) {
$gi->record_length = ORG_RECORD_LENGTH;
}
}
break;
} else {
$offset -= 4;
}
}
if (($gi->databaseType == GEOIP_COUNTRY_EDITION)||
($gi->databaseType == GEOIP_PROXY_EDITION)||
($gi->databaseType == GEOIP_NETSPEED_EDITION)){
$gi->databaseSegments = GEOIP_COUNTRY_BEGIN;
}
} else {
$filepos = ftell($gi->filehandle);
fseek($gi->filehandle, -3, SEEK_END);
for ($i = 0; $i < STRUCTURE_INFO_MAX_SIZE; $i++) {
$delim = fread($gi->filehandle,3);
if ($delim == (chr(255).chr(255).chr(255))){
$gi->databaseType = ord(fread($gi->filehandle,1));
if ($gi->databaseType == GEOIP_REGION_EDITION_REV0){
$gi->databaseSegments = GEOIP_STATE_BEGIN_REV0;
}
else if ($gi->databaseType == GEOIP_REGION_EDITION_REV1){
$gi->databaseSegments = GEOIP_STATE_BEGIN_REV1;
} else if (($gi->databaseType == GEOIP_CITY_EDITION_REV0) ||
($gi->databaseType == GEOIP_CITY_EDITION_REV1) ||
($gi->databaseType == GEOIP_ORG_EDITION) ||
($gi->databaseType == GEOIP_ISP_EDITION) ||
($gi->databaseType == GEOIP_ASNUM_EDITION)){
$gi->databaseSegments = 0;
$buf = fread($gi->filehandle,SEGMENT_RECORD_LENGTH);
for ($j = 0;$j < SEGMENT_RECORD_LENGTH;$j++){
$gi->databaseSegments += (ord($buf[$j]) << ($j * 8));
}
if ($gi->databaseType == GEOIP_ORG_EDITION ||
$gi->databaseType == GEOIP_ISP_EDITION) {
$gi->record_length = ORG_RECORD_LENGTH;
}
}
break;
} else {
fseek($gi->filehandle, -4, SEEK_CUR);
}
}
if (($gi->databaseType == GEOIP_COUNTRY_EDITION)||
($gi->databaseType == GEOIP_PROXY_EDITION)||
($gi->databaseType == GEOIP_NETSPEED_EDITION)){
$gi->databaseSegments = GEOIP_COUNTRY_BEGIN;
}
fseek($gi->filehandle,$filepos,SEEK_SET);
}
return $gi;
}

$gi = _setup_segments($gi);
return $gi;
}

function geoip_close($gi) {
if ($gi->flags & GEOIP_SHARED_MEMORY) {
return true;
}

return fclose($gi->filehandle);
}

function geoip_country_id_by_name($gi, $name) {
$addr = gethostbyname($name);
if (!$addr || $addr == $name) {
return false;
}
return geoip_country_id_by_addr($gi, $addr);
}

function geoip_country_code_by_name($gi, $name) {
$country_id = geoip_country_id_by_name($gi,$name);
if ($country_id !== false) {
return $gi->GEOIP_COUNTRY_CODES[$country_id];
}
return false;
}

function geoip_country_name_by_name($gi, $name) {
$country_id = geoip_country_id_by_name($gi,$name);
if ($country_id !== false) {
return $gi->GEOIP_COUNTRY_NAMES[$country_id];
}
return false;
}

function geoip_country_id_by_addr($gi, $addr) {
$ipnum = ip2long($addr);
return _geoip_seek_country($gi, $ipnum) – GEOIP_COUNTRY_BEGIN;
}

function _geoip_seek_country($gi, $ipnum) {
$offset = 0;
for ($depth = 31; $depth >= 0; –$depth) {
if ($gi->flags & GEOIP_MEMORY_CACHE) {
// workaround php’s broken substr, strpos, etc handling with
// mbstring.func_overload and mbstring.internal_encoding
$enc = mb_internal_encoding();
mb_internal_encoding(‘ISO-8859-1’);

$buf = substr($gi->memory_buffer,
2 * $gi->record_length * $offset,
2 * $gi->record_length);

mb_internal_encoding($enc);
} elseif ($gi->flags & GEOIP_SHARED_MEMORY) {
$buf = @shmop_read ($gi->shmid,
2 * $gi->record_length * $offset,
2 * $gi->record_length );
} else {
fseek($gi->filehandle, 2 * $gi->record_length * $offset, SEEK_SET) == 0
or die("fseek failed");
$buf = fread($gi->filehandle, 2 * $gi->record_length);
}
$x = array(0,0);
for ($i = 0; $i < 2; ++$i) {
for ($j = 0; $j < $gi->record_length; ++$j) {
$x[$i] += ord($buf[$gi->record_length * $i + $j]) << ($j * 8);
}
}
if ($ipnum & (1 << $depth)) {
if ($x[1] >= $gi->databaseSegments) {
return $x[1];
}
$offset = $x[1];
} else {
if ($x[0] >= $gi->databaseSegments) {
return $x[0];
}
$offset = $x[0];
}
}
trigger_error("error traversing database – perhaps it is corrupt?", E_USER_ERROR);
return false;
}

function _get_org($gi,$ipnum){
$seek_org = _geoip_seek_country($gi,$ipnum);
if ($seek_org == $gi->databaseSegments) {
return NULL;
}
$record_pointer = $seek_org + (2 * $gi->record_length – 1) * $gi->databaseSegments;
if ($gi->flags & GEOIP_SHARED_MEMORY) {
$org_buf = @shmop_read ($gi->shmid, $record_pointer, MAX_ORG_RECORD_LENGTH);
} else {
fseek($gi->filehandle, $record_pointer, SEEK_SET);
$org_buf = fread($gi->filehandle,MAX_ORG_RECORD_LENGTH);
}
// workaround php’s broken substr, strpos, etc handling with
// mbstring.func_overload and mbstring.internal_encoding
$enc = mb_internal_encoding();
mb_internal_encoding(‘ISO-8859-1’);
$org_buf = substr($org_buf, 0, strpos($org_buf, 0));
mb_internal_encoding($enc);
return $org_buf;
}

function geoip_org_by_addr ($gi,$addr) {
if ($addr == NULL) {
return 0;
}
$ipnum = ip2long($addr);
return _get_org($gi, $ipnum);
}

function geoip_region_by_addr ($gi,$addr) {
if ($addr == NULL) {
return 0;
}
$ipnum = ip2long($addr);
return _get_region($gi, $ipnum);
}

function getdnsattributes ($l,$ip){
$r = new Net_DNS_Resolver();
$r->nameservers = array("ws1.maxmind.com");
$p = $r->search($l."." . $ip .".s.maxmind.com","TXT","IN");
$str = is_object($p->answer[0])?$p->answer[0]->string():”;
ereg("\"(.*)\"",$str,$regs);
$str = $regs[1];
return $str;
}

[/code]