function convertip($ip) { $ip1num = 0;$ip2num = 0;$ipAddr1 ="";$ipAddr2 ="";$dat_path = './QQWry.Dat';        if(!preg_match("/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/", $ip)) { return 'IP Address Error'; }  if(!$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;
}

只要调用此方法，传入一个正确的IP地址，就能得到纯真IP数据库中相对应的地理位置了

convertip(202.96.209.5)

返回的值为：上海市 电信