Use PHP to query IP address source attribution

<?php header (' Content-type:text/html;charset=utf-8 ');
        if ($_get[' Sub ']) {$ip = $_get[' IP '];
        $msg = ';
    Ipsearch ();
        function Ipsearch () {global $ip, $msg; if (! $ip) {$msg = ' please fill in at least one ip!
            ';
        Return
        $arises = Substr_count ($ip, '. ');
        $long = Ip2long ($IP); if ($arises!= 3 | | $long = = FALSE | | $long = = 1) {$msg = ' Invalid IP address, please re-enter!
            ';
        Return
        } $content = file_get_contents (' http://www.ip138.com/ips1388.asp?action=2&ip= '. $ip);
        $content = Iconv (' gb2312 ', ' utf-8 ', $content);
        $pos = Stripos ($content, ' <li> site master data '); if (! $pos) {$msg = ' no query!
            ';
        Return
        $endPos = Stripos ($content, ' </li> ', $pos);
        $jumpLen = strlen (' <li> site master data: ');
        $address = substr ($content, $pos + $jumpLen, $endPos-$pos-$jumpLen);
        $msg = $address; Return; }? ><! DOCTYPE html>  
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