獲取IP地址

復(fù)制代碼 代碼如下:

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();
?>

方法二

復(fù)制代碼 代碼如下:

function getip ()
{
??????????????? if (getenv('http_client_ip')) {
??????????????????????? $ip = getenv('http_client_ip');
??????????????? } else if (getenv('http_x_forwarded_for')) {
??????????????????????? $ip = getenv('http_x_forwarded_for');
??????????????? } else if (getenv('remote_addr')) {
??????????????????????? $ip = getenv('remote_addr');
??????????????? } else {
??????????????????????? $ip = $_server['remote_addr'];
??????????????? }
??????????????? return $ip;

PHP通過IP地址判斷用戶所在城市
上文已經(jīng)獲得了用戶IP地址，接下來，我們就是根據(jù)這個IP地址獲得用戶所在城市了。開始之前，我們需要下載一個現(xiàn)成的數(shù)據(jù)庫QQ IP數(shù)據(jù)庫。
最新IP地址數(shù)據(jù)庫:http://www.jb51.net/softs/10529.html
使用方法：解壓后QQWry.Dat就是我們想要IP地址數(shù)據(jù)庫，我們新建一個ipcity文件夾，將數(shù)據(jù)庫放在下面。QQ IP數(shù)據(jù)庫使用非常方便，數(shù)據(jù)也很齊全，你可以及時關(guān)注官方更新以保持?jǐn)?shù)據(jù)最新，強力推薦一下：）
接下來，我們在上面的ipcity目錄下新建一個ipaddress.php文件，直接復(fù)制以下代碼進去即可，重要的地方也作了相應(yīng)注釋。B段：

復(fù)制代碼 代碼如下:

/*
函數(shù)名稱：ipCity
參數(shù)說明：$userip——用戶IP地址
函數(shù)功能：PHP通過IP地址判斷用戶所在城市
author:lee
contact:xpsem2010@gmail.com
*/
function ipCity($userip) {
??? //IP數(shù)據(jù)庫路徑，這里用的是QQ IP數(shù)據(jù)庫 20110405 純真版
??? $dat_path = 'QQWry.dat';
??? //判斷IP地址是否有效
??? if(!ereg("^([0-9]{1,3}.){3}[0-9]{1,3}$", $userip)){
??????? return 'IP Address Invalid';
??? }
??? //打開IP數(shù)據(jù)庫
??? if(!$fd = @fopen($dat_path, 'rb')){
??????? return 'IP data file not exists or access denied';
??? }
??? //explode函數(shù)分解IP地址，運算得出整數(shù)形結(jié)果
??? $userip = explode('.', $userip);
??? $useripNum = $userip[0] * 16777216 + $userip[1] * 65536 + $userip[2] * 256 + $userip[3];
??? //獲取IP地址索引開始和結(jié)束位置
??? $DataBegin = fread($fd, 4);
??? $DataEnd = fread($fd, 4);
??? $useripbegin = implode('', unpack('L', $DataBegin));
??? if($useripbegin ??? $useripend = implode('', unpack('L', $DataEnd));
??? if($useripend ??? $useripAllNum = ($useripend - $useripbegin) / 7 + 1;
??? $BeginNum = 0;
??? $EndNum = $useripAllNum;
??? //使用二分查找法從索引記錄中搜索匹配的IP地址記錄
??? while($userip1num>$useripNum || $userip2num??????? $Middle= intval(($EndNum + $BeginNum) / 2);
??????? //偏移指針到索引位置讀取4個字節(jié)
??????? fseek($fd, $useripbegin + 7 * $Middle);
??????? $useripData1 = fread($fd, 4);
??????? if(strlen($useripData1) ??????????? fclose($fd);
??????????? return 'File Error';
??????? }
??????? //提取出來的數(shù)據(jù)轉(zhuǎn)換成長整形，如果數(shù)據(jù)是負(fù)數(shù)則加上2的32次冪
??????? $userip1num = implode('', unpack('L', $useripData1));
??????? if($userip1num ??????? //提取的長整型數(shù)大于我們IP地址則修改結(jié)束位置進行下一次循環(huán)
??????? if($userip1num > $useripNum) {
??????????? $EndNum = $Middle;
??????????? continue;
??????? }
??????? //取完上一個索引后取下一個索引
??????? $DataSeek = fread($fd, 3);
??????? if(strlen($DataSeek) ??????????? fclose($fd);
??????????? return 'File Error';
??????? }
??????? $DataSeek = implode('', unpack('L', $DataSeek.chr(0)));
??????? fseek($fd, $DataSeek);
??????? $useripData2 = fread($fd, 4);
??????? if(strlen($useripData2) ??????????? fclose($fd);
??????????? return 'File Error';
??????? }
??????? $userip2num = implode('', unpack('L', $useripData2));
??????? if($userip2num ??????? //找不到IP地址對應(yīng)城市
??????? if($userip2num ??????????? if($Middle == $BeginNum) {
??????????????? fclose($fd);
??????????????? return 'No Data';
??????????? }
??????????? $BeginNum = $Middle;
??????? }
??? }
??? $useripFlag = fread($fd, 1);
??? if($useripFlag == chr(1)) {
??????? $useripSeek = fread($fd, 3);
??????? if(strlen($useripSeek) ??????????? fclose($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($AddrSeek) ??????????? fclose($fd);
??????????? return 'System Error';
??????? }
??????? $useripFlag = fread($fd, 1);
??????? if($useripFlag == chr(2)) {
??????????? $AddrSeek2 = fread($fd, 3);
??????????? if(strlen($AddrSeek2) ??????????????? fclose($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($AddrSeek2) ??????????????? fclose($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地址對應(yīng)的城市結(jié)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根據(jù)IP地址實現(xiàn)城市切換或跳轉(zhuǎn)
到這里，其實問題已經(jīng)很簡單了，用簡單的js就通通搞定。C段如下：
//根據(jù)IP地址跳轉(zhuǎn)指定頁面js取得城市

復(fù)制代碼 代碼如下:

var city='';

//根據(jù)IP地址所有城市跳轉(zhuǎn)到指定頁面

復(fù)制代碼 代碼如下:

if(city.indexOf("上海市")>=0){
??????? window.location.;
}

將開頭的A段代碼和上面的C段代碼分別放在B段代碼的頭和尾，然后我們在需要跳轉(zhuǎn)的頁面加入以下代碼：

復(fù)制代碼 代碼如下:

?

刷新頁面，是不是達到預(yù)想的效果了呢？
上面的代碼只是簡單的判斷了ip那里就跳到那，如果出現(xiàn)如，我想把湖南所有IP都跳到長沙去，那像衡陽，劉陽，耒陽 這些就要作多次父線處理了，要想知道請看下集。