//update 20120418
更新添加了淘宝的IP库，GET请求返回的是json
这个推荐使用。
//update 20120112
本篇文章所涉及到的代码已经更新到了 http://code.google.com/p/buddy/ 项目中了，大家可以从这个项目中获取代码。
Buddy 你身边的伙伴, 旨在减少我们开发者的工作,让我们有更多的时间来学感兴趣的技术,让我们有更多的时间来陪陪家人！
最近发现百度提供的API已经下线了，无法从API中获取地域信息了，很是郁闷，只有依赖于纯真IP库了。以下贴出代码和方法，希望对大家有所帮助
这个需要下载存在IP库，然后将在构造方法里面修改文件所在的位置就好了
<?php
// +----------------------------------------------------------------------
// | Buddy Framework
// +----------------------------------------------------------------------
// | Copyright (c) 2011 http://buddy.woshimaijia.com/ All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: xinqiyang <xinqiyang@gmail.com>
// +----------------------------------------------------------------------
/**
* IP location Query class
* <code>
* $ip = Iplocation::instance();
* $r = $ip->getlocation('123.120.1.160');
* </code>
*
*/
class Iplocation
{
/**
* QQWry.Dat file point
*
* @var resource
*/
private $fp;
/**
* first ip
*
* @var int
*/
private $firstip;
/**
* last address
*
* @var int
*/
private $lastip;
/**
* total ip count
*
* @var int
*/
private $totalip;
/**
* construct
*
* @param string $filename
* @return IpLocation
*/
public function __construct($filename='QQWry.Dat') {
$this->fp = 0;
if (($this->fp = fopen(dirname(__FILE__).DIRECTORY_SEPARATOR.'Resource/'.$filename, 'rb')) !== false) {
$this->firstip = $this->getlong();
$this->lastip = $this->getlong();
$this->totalip = ($this->lastip - $this->firstip) / 7;
}
}
/**
* getlong
*
* @access private
* @return int
*/
private function getlong() {
$result = unpack('Vlong', fread($this->fp, 4));
return $result['long'];
}
/**
* return 3 bit
* @access private
* @return int
*/
private function getlong3() {
$result = unpack('Vlong', fread($this->fp, 3).chr(0));
return $result['long'];
}
/**
* return packip address
*
* @access private
* @param string $ip
* @return string
*/
private function packip($ip) {
return pack('N', intval(ip2long($ip)));
}
/**
* return read string
*
* @access private
* @param string $data
* @return string
*/
private function getstring($data = "") {
$char = fread($this->fp, 1);
while (ord($char) > 0) { // string store use c formate use \0 end
$data .= $char; // link the string
$char = fread($this->fp, 1);
}
return $data;
}
/**
* return area info
*
* @access private
* @return string
*/
private function getarea() {
$byte = fread($this->fp, 1);
switch (ord($byte)) {
case 0:
$area = "";
break;
case 1:
case 2:
fseek($this->fp, $this->getlong3());
$area = $this->getstring();
break;
default:
$area = $this->getstring($byte);
break;
}
return $area;
}
/**
* return ip location info
* $r['contry'] $r['area']
* @access public
* @param string $ip
* @return array
*/
public function getlocation($ip='') {
if (!$this->fp) return null;
if(empty($ip)) $ip = getip();
$location['ip'] = gethostbyname($ip);
$ip = $this->packip($location['ip']);
$l = 0;
$u = $this->totalip;
$findip = $this->lastip;
while ($l <= $u) {
$i = floor(($l + $u) / 2);
fseek($this->fp, $this->firstip + $i * 7);
$beginip = strrev(fread($this->fp, 4));
if ($ip < $beginip) {
$u = $i - 1;
}
else {
fseek($this->fp, $this->getlong3());
$endip = strrev(fread($this->fp, 4));
if ($ip > $endip) {
$l = $i + 1;
}
else {
$findip = $this->firstip + $i * 7;
break;
}
}
}
fseek($this->fp, $findip);
$location['beginip'] = long2ip($this->getlong());
$offset = $this->getlong3();
fseek($this->fp, $offset);
$location['endip'] = long2ip($this->getlong());
$byte = fread($this->fp, 1);
switch (ord($byte)) {
case 1:
$countryOffset = $this->getlong3();
fseek($this->fp, $countryOffset);
$byte = fread($this->fp, 1);
switch (ord($byte)) {
case 2:
fseek($this->fp, $this->getlong3());
$location['country'] = $this->getstring();
fseek($this->fp, $countryOffset + 4);
$location['area'] = $this->getarea();
break;
default:
$location['country'] = $this->getstring($byte);
$location['area'] = $this->getarea();
break;
}
break;
case 2:
fseek($this->fp, $this->getlong3());
$location['country'] = $this->getstring();
fseek($this->fp, $offset + 8);
$location['area'] = $this->getarea();
break;
default:
$location['country'] = $this->getstring($byte);
$location['area'] = $this->getarea();
break;
}
if ($location['country'] == " CZ88.NET") {
$location['country'] = "Unknow";
}
if ($location['area'] == " CZ88.NET") {
$location['area'] = "";
}
//change gbk to utf8
$location['country'] = mb_convert_encoding($location['country'], 'UTF8','GBK');
$location['area'] = mb_convert_encoding($location['area'], 'UTF8','GBK');
return $location;
}
/**
* excute complete then close file handler
*
*/
public function __destruct() {
if ($this->fp) {
fclose($this->fp);
}
$this->fp = 0;
}
}
最近项目中用到了获取用户IP所在地的信息，主要是为了从IP去判断用户所在的城市，现在的城市信息基本上有分几种
一种是用ID编号来关联城市的，还有使用缩写的代码来关联城市的。
我们通过IP去获取所在的用户的 城市的详细信息，比如运行以下的结果得到的是 "福建省福州市 电信"
可以得到用户的 省市及所使用的网络接入的信息
这里调用的是百度的开放查询接口，通过网页的方式去查询然后从返回的结果中去匹配我们所需要的信息，效果还行，代码在下面，还是能凑合着用的。
var_dump(getAddress('202.101.98.54','福州'));
function getAddress($ip=null,$address='') {
$url = "http://open.baidu.com/ipsearch/s?wd={$ip}&tn=baiduip";
$res = mb_convert_encoding(HttpRequest($url), 'UTF-8', 'GBK');
//var_dump($res);
if ( preg_match('#来自：<b>(.+)</b>#Ui', $res, $m) ) {
if (is_int(strpos($m[1], $address))) {
return $m[1];
}
}
}
function HttpRequest($url, $data=array()) {
$ch = curl_init();
if (is_array($data) && $data) {
$formdata = http_build_query($data);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $formdata);
}
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt($ch, CURLOPT_TIMEOUT, 2);
return curl_exec($ch);
}