php如何實現根據ip跳轉

$ipNum || $ip2num<$ipNum) { $Middle= intval(($EndNum + $BeginNum) / 2); //偏移指针到索引位置读取4个字节 fseek($fd, $ipbegin + 7 * $Middle); $ipData1 = fread($fd, 4); if(strlen($ipData1) < 4) { fclose($fd); return 'System Error'; } //提取出来的数据转换成长整形，如果数据是负数则加上2的32次幂 $ip1num = implode('', unpack('L', $ipData1)); if($ip1num < 0) $ip1num += pow(2, 32); //提取的长整型数大于我们IP地址则修改结束位置进行下一次循环 if($ip1num > $ipNum) { $EndNum = $Middle; continue; } //取完上一个索引后取下一个索引 $DataSeek = fread($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) $ip2num += pow(2, 32); //没找到提示未知 if($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); //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'; } return $ipaddr; } //查找字符串 function findstr($str, $substr) { $m = strlen($str); $n = strlen($substr ); if ($m < $n) return false ; for ($i=0; $i <=($m-$n+1); $i ++){ $sub = substr( $str, $i, $n); if ( strcmp($sub, $substr) == 0) return true; } return false ; } $xp_UserIp = ($_SERVER["HTTP_VIA"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] : $_SERVER["REMOTE_ADDR"]; $Clientip = ($xp_UserIp) ? $xp_UserIp : $_SERVER["REMOTE_ADDR"]; $ClientSity=convertip($Clientip); if (findstr($ClientSity,"北京")){ //out.print("beijing"); Header("Location: http://www.qq.com"); }else{ //out.print("false beijing"); Header("Location: http://www.163.com"); } ?>