PHP determines the city based on the IP address to implement city switching or jump code

It is quite simple to obtain the IP address first. The following will introduce two codes for obtaining the IP address. Later, you need to use the QQIP library to find which IP segment the current IP belongs to and then get the city field and return it.

Get IP address

The code is as follows

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代码如下

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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();
?>

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();
?>

Method 2

代码如下

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For more details, please see: http://www.bkjia.com/phper/php/33938.htm

PHP determines the city where the user is located through the IP address
We have obtained the user's IP address above. Next, we will obtain the user's city based on this IP address. Before starting, we need to download a ready-made database QQ IP database.

The latest IP address database: http://8.zjdx2.crsky.com/201209/qqwry0830.rar

How to use: After decompression, QQWry.Dat is the IP address database we want. We create a new ipcity folder and place the database below. The QQ IP database is very convenient to use and the data is very complete. You can follow the official updates in time to keep the data up to date. I highly recommend it:)
Next, we create a new ipaddress.php file in the ipcity directory above and copy it directly. Just enter the following code, and the important places are also commented accordingly. Section B:

The code is as follows

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/*
Function name: ipCity
Parameter description: $userip——user IP address
Function function: PHP determines the city where the user is located through the IP address
author:lee
contact:xpsem2010@gmail.com
*/
function ipCity($userip) {
//IP database path, the QQ IP database 20110405 pure version is used here
$dat_path = 'QQWry.dat';

//Determine whether the IP address is valid
if(!ereg("^([0-9]{1,3}.){3}[0-9]{1,3}$", $userip)) {
"""""""""""""""" return 'IP data file not exists or access denied';
}

//explode function decomposes the IP address, and the operation yields an integer result
$userip = explode('.', $userip );
$useripNum = $userip[0] * 16777216 + $userip[1] * 65536 + $userip[2] * 256 + $userip[3];

//Get IP address index Start and end positions

$DataBegin = fread($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;

//Use binary search method to search for matching IP address records from the index records

while($userip1num>$useripNum || $userip2num<$useripNum) {

$Middle= intval(($EndNum + $BeginNum) / 2);

//Offset the pointer to the index position to read 4 bytes

fseek($fd, $useripbegin + 7 * $Middle);
$useripData1 = fread($fd, 4);
if(strlen($useripData1) < 4) {

fclose($fd);

return 'File Error ';
}
//The extracted data is converted into a long integer. If the data is a negative number, add 2 to the 32nd power
$userip1num = implode('', unpack('L', $useripData1 ));
if($userip1num < 0) $userip1num += pow(2, 32);

//If the extracted long integer is greater than our IP address, modify the end position for the next time Loop
if($userip1num > $useripNum) {
$EndNum = $Middle;
continue;

}

//Get the next index after fetching the previous index
$DataSeek = fread($fd, 3);
if(strlen($DataSeek) < 3) {
fclose($ fd);
return 'File Error';
}
$DataSeek = implode('', unpack('L', $DataSeek.chr(0)));
fseek($fd . ';
}
$userip2num = implode('', unpack('L', $useripData2));
if($userip2num < 0) $userip2num += pow(2, 32);

//Cannot find the city corresponding to the IP address
if($userip2num < $useripNum) {
if($Middle == $BeginNum) {

fclose($fd);

return 'No Data'; $fd, 1);
if($useripFlag == chr(1)) {
using using using use using using using using through out through through using through through through using ’ s through through through using through through out through out through through through through’s'‐' ‐ ‐ ‐ ’
return 'System Error'; );
$useripFlag = fread($fd, 1);
}

if($useripFlag == chr(2)) {
$AddrSeek = fread($fd, 3 );

If (STRLEN ($ addrseek) & lt; 3) {

fclose ($ fd);
Return 'System Error'; 1);
if($useripFlag == chr(2)) {
$AddrSeek2 = fread($fd, 3);
if(strlen($AddrSeek2) < 3) {
fclose($fd);
               return 'System Error';
                                           fseek ($fd, $AddrSeek2);
                                                                                                                                                                     )) != 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

代码如下

代码如下	复制代码
var city='';

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

var city='';

代码如下	复制代码

//根据IP地址所有城市跳转到指定页面

代码如下

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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：

代码如下

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Refresh the page. Does it achieve the desired effect?

The above code simply determines the IP address and jumps there. If something like this appears, I want to jump all the IP addresses in Hunan to Changsha. Then, Hengyang, Liuyang, Leiyang, etc. need to be done. The parent line has been dealt with many times. If you want to know, please watch the next episode.

PHP determines the city based on the IP address to implement city switching or jump code_PHP tutorial