本文给大家主要分享的是在php中如何获取用户ip地址、php根据ip判断用户所在城市以及php根据ip实现城市切换或跳转的问题。
我们先来看下个人常用的代码
PHP
<?php
include_once('./qqwry.php');
$QQWry=new QQWry;
function get_real_ip(){
$ip=false;
if(!empty($_SERVER["HTTP_CLIENT_IP"])){
$ip = $_SERVER["HTTP_CLIENT_IP"];
}
if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$ips = explode (", ", $_SERVER['HTTP_X_FORWARDED_FOR']);
if ($ip) { array_unshift($ips, $ip); $ip = FALSE; }
for ($i = 0; $i < count($ips); $i++) {
if (!eregi ("^(10|172\.16|192\.168)\.", $ips[$i])) {
$ip = $ips[$i];
break;
}
}
}
return $ip;
}
function is_ip($str) {
$ip = explode(".", $str);
if (count($ip)<4 || count($ip)>4) return 0;
foreach($ip as $ip_addr) {
if ( !is_numeric($ip_addr) ) return 0;
if ( $ip_addr<0 || $ip_addr>255 ) return 0;
}
return 1;
}
$ip=$_SERVER['REMOTE_ADDR'];
$ifErr=$QQWry->QQWry($ip);
$city = $QQWry->Country.$QQWry->Local;
//echo $city;*/
if (strpos($city,'玄武区')!==false){
$city = "玄武区";
}
else if(strpos($city,'仙林')!==false){
$city = "仙林";
}
else if(strpos($city,'秦淮区')!==false){
$city = "秦淮区";
}
else if(strpos($city,'江宁')!==false){
$city = "江宁";
}
else if(strpos($city,'鼓楼')!==false){
$city = "鼓楼";
}
else{
$city = "栖霞";
}
if (isset($_GET['chengshi'])) { //Ê×Ïȼì²âÊÇ·ñ»ñµÃÁË GET ´«µÝµÄÊý¾Ý
setcookie("cookie_city",$_GET['chengshi'],time()+3600*24);
$city = $_GET['chengshi'];
}
else if (isset($_COOKIE["cookie_city"])) { //¼ì²âÊÇ·ñ´æÔÚêdzÆCookie
$city = $_COOKIE["cookie_city"]; //ÏÔʾCookie±£´æµÄÊý¾Ý
}
else {
setcookie("cookie_city",$city,time()+3600*24); //´¿³õʼ»¯´Ë±äÁ¿
$_COOKIE["cookie_city"] = $city;
}
?>HTML
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="utf-8"/>
<LINK href="css/css.css" type=text/css rel=stylesheet>
<SCRIPT src="js/jquery-1.4.2.min.js" type=text/javascript></SCRIPT>
<title>城市切换</title>
</head>
<BODY>
<p class=selCity id=allCity style="DISPLAY: none">
<p class=area>
<TABLE>
<TBODY>
<TR>
<TD><A class=cur href="show.html">玄武区</A></TD>
<TD><A href="show1.html">仙林</A></TD>
<TD><A href="show2.html">秦淮区</A></TD>
<TD><A href="show3.html">鼓楼</A></TD>
<TD><A href="show4.html">江宁</A></TD>
<TD><A href="show5.html">栖霞区</A></TD>
</TR>
</TBODY></TABLE>
<p class=none><A id=foldin href="javascript:;">全部</A></p></p></p>
<p class=header>
<p class=area>
<p class=r>
<p class="topCtiy clear">
<UL>
<LI class=i1><A href="index.php">全部小区</A></LI>
<LI class=i1>
<?php
echo $city;
?>
</LI>
<LI class=i2 id=changeCity>切换城市</LI>
</UL>
</p>
</p>
</p>
</p>
<SCRIPT type=text/javascript>
jQuery(function(){
$("#changeCity").click(function(a){
$("#allCity").slideDown(300);
a.stopPropagation();
$(this).blur();
});
$("#allCity").click(function(a){
a.stopPropagation()
});
$(document).click(function(a){
a.button!=2 && $("#allCity").slideUp(300)
});
$("#foldin").click(function(){
$("#allCity").slideUp(300)
});
});
</SCRIPT>
</body>
</html>另外附上网友的实现方法：
立即学习“PHP免费学习笔记（深入）”；
使用方法：解压后QQWry.Dat就是我们想要IP地址数据库，我们新建一个ipcity文件夹，将数据库放在下面。QQ IP数据库使用非常方便，数据也很齐全，你可以及时关注官方更新以保持数据最新，强力推荐一下：）
接下来，我们在上面的ipcity目录下新建一个ipaddress.php文件，直接复制以下代码进去即可，重要的地方也作了相应注释。B段：
<?
/*
函数名称：ipCity
参数说明：$userip——用户IP地址
函数功能：PHP通过IP地址判断用户所在城市
author:lee
contact:xpsem2010@gmail.com
*/
function ipCity($userip) {
//IP数据库路径，这里用的是QQ IP数据库 20110405 纯真版
$dat_path = 'QQWry.dat';
//判断IP地址是否有效
if(!ereg("^([0-9]{1,3}.){3}[0-9]{1,3}$", $userip)){
return 'IP Address Invalid';
}
//打开IP数据库
if(!$fd = @fopen($dat_path, 'rb')){
return 'IP data file not exists or access denied';
}
//explode函数分解IP地址，运算得出整数形结果
$userip = explode('.', $userip);
$useripNum = $userip[0] * 16777216 + $userip[1] * 65536 + $userip[2] * 256 + $userip[3];
//获取IP地址索引开始和结束位置
$DataBegin = fread($fd, 4);
$DataEnd = fread($fd, 4);
$useripbegin = implode('', unpack('L', $DataBegin));
if($useripbegin < 0) $useripbegin += pow(2, 32);
$useripend = implode('', unpack('L', $DataEnd));
if($useripend < 0) $useripend += pow(2, 32);
$useripAllNum = ($useripend - $useripbegin) / 7 + 1;
$BeginNum = 0;
$EndNum = $useripAllNum;
//使用二分查找法从索引记录中搜索匹配的IP地址记录
while($userip1num>$useripNum || $userip2num<$useripNum) {
$Middle= intval(($EndNum + $BeginNum) / 2);
//偏移指针到索引位置读取4个字节
fseek($fd, $useripbegin + 7 * $Middle);
$useripData1 = fread($fd, 4);
if(strlen($useripData1) < 4) {
fclose($fd);
return 'File Error';
}
//提取出来的数据转换成长整形，如果数据是负数则加上2的32次幂
$userip1num = implode('', unpack('L', $useripData1));
if($userip1num < 0) $userip1num += pow(2, 32);
//提取的长整型数大于我们IP地址则修改结束位置进行下一次循环
if($userip1num > $useripNum) {
$EndNum = $Middle;
continue;
}
//取完上一个索引后取下一个索引
$DataSeek = fread($fd, 3);
if(strlen($DataSeek) < 3) {
fclose($fd);
return 'File Error';
}
$DataSeek = implode('', unpack('L', $DataSeek.chr(0)));
fseek($fd, $DataSeek);
$useripData2 = fread($fd, 4);
if(strlen($useripData2) < 4) {
fclose($fd);
return 'File Error';
}
$userip2num = implode('', unpack('L', $useripData2));
if($userip2num < 0) $userip2num += pow(2, 32);
//找不到IP地址对应城市
if($userip2num < $useripNum) {
if($Middle == $BeginNum) {
fclose($fd);
return 'No Data';
}
$BeginNum = $Middle;
}
}
$useripFlag = fread($fd, 1);
if($useripFlag == chr(1)) {
$useripSeek = fread($fd, 3);
if(strlen($useripSeek) < 3) {
fclose($fd);
return 'System Error';
}
$useripSeek = implode('', unpack('L', $useripSeek.chr(0)));
fseek($fd, $useripSeek);
$useripFlag = fread($fd, 1);
}
if($useripFlag == chr(2)) {
$AddrSeek = fread($fd, 3);
if(strlen($AddrSeek) < 3) {
fclose($fd);
return 'System Error';
}
$useripFlag = fread($fd, 1);
if($useripFlag == chr(2)) {
$AddrSeek2 = fread($fd, 3);
if(strlen($AddrSeek2) < 3) {
fclose($fd);
return 'System Error';
}
$AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0)));
fseek($fd, $AddrSeek2);
} else {
fseek($fd, -1, SEEK_CUR);
}
while(($char = fread($fd, 1)) != chr(0))
$useripAddr2 .= $char;
$AddrSeek = implode('', unpack('L', $AddrSeek.chr(0)));
fseek($fd, $AddrSeek);
while(($char = fread($fd, 1)) != chr(0))
$useripAddr1 .= $char;
} else {
fseek($fd, -1, SEEK_CUR);
while(($char = fread($fd, 1)) != chr(0))
$useripAddr1 .= $char;
$useripFlag = fread($fd, 1);
if($useripFlag == chr(2)) {
$AddrSeek2 = fread($fd, 3);
if(strlen($AddrSeek2) < 3) {
fclose($fd);
return 'System Error';
}
$AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0)));
fseek($fd, $AddrSeek2);
} else {
fseek($fd, -1, SEEK_CUR);
}
while(($char = fread($fd, 1)) != chr(0)){
$useripAddr2 .= $char;
}
}
fclose($fd);
//返回IP地址对应的城市结果
if(preg_match('/http/i', $useripAddr2)) {
$useripAddr2 = '';
}
$useripaddr = "$useripAddr1 $useripAddr2";
$useripaddr = preg_replace('/CZ88.Net/is', '', $useripaddr);
$useripaddr = preg_replace('/^s*/is', '', $useripaddr);
$useripaddr = preg_replace('/s*$/is', '', $useripaddr);
if(preg_match('/http/i', $useripaddr) || $useripaddr == '') {
$useripaddr = 'No Data';
}
return $useripaddr;
}
?>PHP根据IP地址实现城市切换或跳转
到这里，其实问题已经很简单了，用简单的js就通通搞定。C段如下：
//根据IP地址跳转指定页面js取得城市
var city='<?echo ipCity($xp_UserIp);?>';
//根据IP地址所有城市跳转到指定页面
if(city.indexOf("上海市")>=0){
window.location.href="http://shanghai.demo.com/";
}将开头的A段代码和上面的C段代码分别放在B段代码的头和尾，然后我们在需要跳转的页面加入以下代码：
<script src="/ipcity/ipaddress.php" type="text/javascript" language="javascript"></script>
刷新页面，是不是达到预想的效果了呢？
总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。
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