PHP根据IP地址判断城市实现城市切换或跳转代码_PHP教程

function GetIP() {
if ($_SERVER["HTTP_X_FORWARDED_FOR"])
$ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
else if ($_SERVER["HTTP_CLIENT_IP"])
$ip = $_SERVER["HTTP_CLIENT_IP"];
else if ($_SERVER["REMOTE_ADDR"])
$ip = $_SERVER["REMOTE_ADDR"];
else if (getenv("HTTP_X_FORWARDED_FOR"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else if (getenv("HTTP_CLIENT_IP"))
$ip = getenv("HTTP_CLIENT_IP");
else if (getenv("REMOTE_ADDR"))
$ip = getenv("REMOTE_ADDR");
else
$ip = "Unknown";
return $ip;
}
echo GetIP();
?>

/*
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;
}
?>

var city='';

if(city.indexOf("上海市")>=0){
window.location.href="http://shanghai.demo.com/";
}