Detailed explanation of how to convert IP address to real address in PHP

If you want to convert an IPv4 address to a real address, you must refer to the IP database. The commercial IP database is stored in a relational database. It is very convenient to query and use, but the cost is not what individuals and small companies are willing to bear, so it is simple to apply. The idea is to use some free IP databases or query APIs provided by some large websites. Their data volume is enough for us to use.
1. Use the Innocence IP database
Use the local QQWry.Dat file. The advantage is that the query speed is very fast. The disadvantage is that the database file must be placed in its own space. And update the database occasionally. Without further ado due to time constraints, here is the function that uses this file. If you are using this function in WordPress, write the following code into functions.php under the theme, and then in the comments-list output That's it; if it is referenced by other programs, enter a valid IPv4 address to get a real address.

Copy code The code is as follows:

function convertip($ip) {
 //IP data file path
 $dat_path = 'QQWry.Dat';
 //Check IP address
 //if(! preg_match("/^d{1,3}.d{1,3}.d{1,3}.d{1,3}$/", $ip)) {
 // return 'IP Address Error';
 //}
 //Open IP data file
 if(!$fd = @fopen($dat_path, 'rb')){
 return 'IP date file not exists or access denied';
 }
 //Decompose the IP for operation and obtain an integer number
 $ip = explode('.', $ip);
 $ipNum = $ip[0] * 16777216 + $ip[1] * 65536 + $ip[2] * 256 + $ip[3];
 //Get the start and end position of IP data index
 $DataBegin = fread($fd, 4) ;
 $DataEnd = fread($fd, 4);
 $ipbegin = implode('', unpack('L', $DataBegin));
 if($ipbegin < 0) $ipbegin += pow(2, 32);
 $ipend = implode('', unpack('L', $DataEnd));
 if($ipend < 0) $ipend += pow(2, 32);
 $ipAllNum = ($ipend - $ipbegin) / 7 + 1;
 $BeginNum = 0;
 $EndNum = $ipAllNum;
 //Use binary search method to record from the index Search for matching IP records in 
 while($ip1num>$ipNum || $ip2num<$ipNum) {
 $Middle= intval(($EndNum + $BeginNum) / 2);
 //Partial Move the pointer to the index position and read 4 bytes
 fseek($fd, $ipbegin + 7 * $Middle);
 $ipData1 = fread($fd, 4);
 if(strlen($ ipdata1) & lt; 4) {
 fclose ($ fd); 
 Return 'System Error'; 
} 
 // The data extracted data conversion and plastic surgery. 32nd power
 $ip1num = implode('', unpack('L', $ipData1));
 if($ip1num < 0) $ip1num += pow(2, 32);
                                                                                                                                                                                   ​>} 
 // After taking the previous index, remove a index 
 $ dataseek = FREAD ($ fd, 3); 
 if (strong ($ dataseek) & lt; 3) {
 fclose ($fd);
           return 'System Error'; $fd, $DataSeek);
              $ipData2 = fread($fd, 4);                                                                                                                                                                   System Error';
 }
 $ip2num = implode('', unpack('L', $ipData2));
 if($ip2num < 0) $ip2num += pow(2, 32 );
 //Unknown prompt not found
 if($ip2num < $ipNum) {
 return 'Unknown';
 }

    $ipFlag = fread($fd, 1);
    if($ipFlag == chr(1)) {
        $ipSeek = fread($fd, 3);
        if(strlen($ipSeek) < 3) {
            fclose($fd);
            return 'System Error';
        }
        $ipSeek = implode('', unpack('L', $ipSeek.chr(0)));
        fseek($fd, $ipSeek);
        $ipFlag = fread($fd, 1);
    }
    if($ipFlag == chr(2)) {
        $AddrSeek = fread($fd, 3);
        if(strlen($AddrSeek) < 3) {
            fclose($fd);
            return 'System Error';
        }
        $ipFlag = fread($fd, 1);
        if($ipFlag == 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))
            $ipAddr2 .= $char;
        $AddrSeek = implode('', unpack('L', $AddrSeek.chr(0)));
        fseek($fd, $AddrSeek);
        while(($char = fread($fd, 1)) != chr(0))
            $ipAddr1 .= $char;
    } else {
        fseek($fd, -1, SEEK_CUR);
        while(($char = fread($fd, 1)) != chr(0))
            $ipAddr1 .= $char;
        $ipFlag = fread($fd, 1);
        if($ipFlag == 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)){
            $ipAddr2 .= $char;
        }
    }
    fclose($fd);
    //最后做相应的替换操作后返回结果
    if(preg_match('/http/i', $ipAddr2)) {
        $ipAddr2 = '';
    }
 $ipaddr = "$ipAddr1 $ipAddr2";
 $ipaddr = preg_replace('/CZ88.Net/is', '', $ipaddr);
 $ipaddr = preg_replace('/^s* /is', '', $ipaddr);
 $ipaddr = preg_replace('/s*$/is', '', $ipaddr);
 if(preg_match('/http/i', $ ipaddr) || $ipaddr == '') {
 $ipaddr = 'Unknown';
 }
 $ipaddr = iconv('gbk', 'utf-8//IGNORE', $ipaddr) ; //Convert encoding, if the gbk of the web page can delete this line 
 return $ipaddr;
}

2. Use the portal interface
Currently, it is known that Tencent, Sina, NetEase, Sohu and Google provide IP address query API, but the only ones that can be found are Tencent, Sina and NetEase. Google seems to use Google Maps, so there is no research. After looking at several domestic Tencent services, they provide JavaScript, NetEase provides XML, and Sina has a variety of formats available. Note that non-XML data sources are all in GBK format, regardless of whether they are JavaScript calls or PHP calls. You need to convert the encoding, otherwise you will get garbled codes. What needs more attention is that if you query multiple IPs at once, using the portal's API to query will be very slow. I probably wrote a for loop and tried it, whether using PHP to parse XML or the file_get_contents() function to obtain the content. , querying more than 10 times will become very slow and may even time out.

Tencent’s IP address API interface address: http://fw.qq.com/ipaddress, the returned data format is: var IPData = new Array("123.124.2.85","","Beijing City","");, a JavaScript object, it is not yet known how to enter an IP query.
Sina’s IP address query interface: http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js
Sina’s multi-region testing method: http://int.dpool. sina.com.cn/iplookup/iplookup.php?format=js&ip=123.124.2.85
NetEase Youdao’s IP address query interface: http://www.youdao.com/smartresult-xml/search.s?type =ip&q=123.124.2.85
//PHP calling method of Tencent API

Copy code Code As follows:

function getIpPlace(){
 $ip=file_get_contents("http://fw.qq.com/ipaddress");
 $ip=str_replace('"' ,' ',$ip);
 $ip2=explode("(",$ip);
 $a=substr($ip2[1],0,-2);
 $b= explode(",",$a);
 return $b;
}
$ip=getIpPlace();
print_r($ip);

//Youdao API PHP calling method

Copy code The code is as follows:

$url = "http:www.youdao.com/smartresult-xml/search.s?type=ip&q=".$ip;
$doc = new DOMDocument();
 $doc-> load($url);
 $smartresult = $doc->getElementsByTagName("product");
 foreach($smartresult as $product)
 {
 $locations = $product-> getElementsByTagName("location");
 $location = $locations->item(0)->nodeValue;
 }
 if($location != "")
 {
 echo $i.".".$ip;
 echo " User from ".$location.";
 }
 else
 {
 echo $i.".". $ip;
 echo "Netizens from Mars";
 }
public function sinaIPApi($ip){
 $str = file_get_contents("http://int.dpool.sina.com. cn/iplookup/iplookup.php?ip=".$ip);
 $str = iconv("gbk", "utf-8//IGNORE", $str);
 preg_match_all("/[/ x{4e00}-/x{9fa5}]+/u",$str,$get);
 $add = implode('',$get[0]);
 return $add;
}
//$get is a great two-dimensional array

Among them, Youdao and Sina are written by me. Sina API can also use the file_get_contents() function like Tencent API to obtain the address and then use a series of string functions to process it. The function I wrote uses regular expressions from Sina The return result provides a string containing Chinese characters and stores it in a two-dimensional array in segments. This may only be useful for Sina's API and may contain bugs. For example, after querying the IP address assigned to me by the school, var_dump() the $get variable in the function and get the following results: array(1) { [0]=> array(6) { [0]=> string( 6) "China" [1]=> string(6) "Beijing" [2]=> string(6) "Beijing" [3]=> string(9) "Education Network" [4]=> ; string(6) "school" [5]=> string(18) "China University of Geosciences" } }, and the output result of the function is "China University of Geosciences, Beijing Education Network School, Beijing, China". I hope my ideas are consistent with The method can be useful to others.

Finally, please use the first method if it is WordPress. Otherwise, using the API to query the real addresses of all commenters at the same time will cause PHP to time out. I hope that all the experts will have a better method. As for the restrictions, The display and display methods are all WordPress application issues. At the same time, the idea is the same for Java and C#. I will elaborate on these follow-up issues after I finish the exam.

Detailed explanation of how to convert IP address to real address in PHP_PHP Tutorial