#纯真数据库调用函数（需要下载纯真数据库文件）function convertip($ip) {   $ip1num = 0;  $ip2num = 0;  $ipAddr1 ="";  $ipAddr2 ="";  $dat_path = './QQWry.Dat';        //纯真数据库文件位置  if(!preg_match("/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/", $ip)) {     return 'IP Address Error';   }    if(!$fd = @fopen($dat_path, 'rb')){     return 'IP date file not exists or access denied';   }    $ip = explode('.', $ip);   $ipNum = $ip[0] * 16777216 + $ip[1] * 65536 + $ip[2] * 256 + $ip[3];    $DataBegin = fread($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 = $ipAllNum;    while($ip1num>$ipNum || $ip2num<$ipNum) {     $Middle= intval(($EndNum + $BeginNum) / 2);     fseek($fd, $ipbegin + 7 * $Middle);     $ipData1 = fread($fd, 4);     if(strlen($ipData1) < 4) {       fclose($fd);       return 'System Error';     }    $ip1num = implode('', unpack('L', $ipData1));     if($ip1num < 0) $ip1num += pow(2, 32);     if($ip1num > $ipNum) {       $EndNum = $Middle;       continue;     }     $DataSeek = fread($fd, 3);     if(strlen($DataSeek) < 3) {       fclose($fd);       return 'System Error';     }     $DataSeek = implode('', unpack('L', $DataSeek.chr(0)));     fseek($fd, $DataSeek);     $ipData2 = fread($fd, 4);     if(strlen($ipData2) < 4) {       fclose($fd);       return 'System Error';     }     $ip2num = implode('', unpack('L', $ipData2));     if($ip2num < 0) $ip2num += pow(2, 32);        if($ip2num < $ipNum) {         if($Middle == $BeginNum) {           fclose($fd);           return 'Unknown';         }         $BeginNum = $Middle;       }     }      $ipFlag = fread($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);    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';   }   return $ipaddr; }

 

#函数调用echo convertip('202.96.209.5');