PHP判断IP并转跳到相应城市分站的代码示范

<?php    
class QQWry{    
    var $StartIP=0;    
    var $EndIP=0;    
    var $Country='';    
    var $Local='';    
    var $CountryFlag=0; // 标识 Country位置    
             // 0x01,随后3字节为Country偏移,没有Local    
             // 0x02,随后3字节为Country偏移，接着是Local    
             // 其他,Country,Local,Local有类似的压缩。可能多重引用。    
    var $fp;    
   
    var $FirstStartIp=0;    
    var $LastStartIp=0;    
    var $EndIpOff=0 ;    
   
    function getStartIp($RecNo){    
     $offset=$this->FirstStartIp+$RecNo * 7 ;    
     @fseek($this->fp,$offset,SEEK_SET) ;    
     $buf=fread($this->fp ,7) ;    
     $this->EndIpOff=ord($buf[4]) + (ord($buf[5])*256) + (ord($buf[6])* 256*256);    
     $this->StartIp=ord($buf[0]) + (ord($buf[1])*256) + (ord($buf[2])*256*256) + (ord($buf[3])*256*256*256);    
     return $this->StartIp;    
    }    
   
    function getEndIp(){    
     @fseek ( $this->fp , $this->EndIpOff , SEEK_SET ) ;    
     $buf=fread ( $this->fp , 5 ) ;    
     $this->EndIp=ord($buf[0]) + (ord($buf[1])*256) + (ord($buf[2])*256*256) + (ord($buf[3])*256*256*256);    
     $this->CountryFlag=ord ( $buf[4] ) ;    
     return $this->EndIp ;    
    }    
   
    function getCountry(){    
     switch ( $this->CountryFlag ) {    
        case 1:    
        case 2:    
         $this->Country=$this->getFlagStr ( $this->EndIpOff+4) ;    
         //echo sprintf('EndIpOffset=(%x)',$this->EndIpOff );    
         $this->Local=( 1 == $this->CountryFlag )? '' : $this->getFlagStr ( $this->EndIpOff+8);    
         break ;    
        default :    
         $this->Country=$this->getFlagStr ($this->EndIpOff+4);    
         $this->Local=$this->getFlagStr ( ftell ( $this->fp ));    
     }    
    }    
   
   
    function getFlagStr ($offset){    
     $flag=0 ;    
     while(1){    
        @fseek($this->fp ,$offset,SEEK_SET) ;    
        $flag=ord(fgetc($this->fp ) ) ;    
        if ( $flag == 1 || $flag == 2 ) {    
         $buf=fread ($this->fp , 3 ) ;    
         if ($flag==2){    
            $this->CountryFlag=2;    
            $this->EndIpOff=$offset - 4 ;    
         }    
         $offset=ord($buf[0]) + (ord($buf[1])*256) + (ord($buf[2])* 256*256);    
        }    
        else{    
         break ;    
        }    
   
     }    
     if($offset<12)    
        return '';    
     @fseek($this->fp , $offset , SEEK_SET ) ;    
   
     return $this->getStr();    
    }    
   
    function getStr ( )    
    {    
     $str='' ;    
     while ( 1 ) {    
        $c=fgetc ( $this->fp ) ;    
        //echo "$cn" ;    
   
        if(ord($c[0])== 0 )    
         break ;    
        $str.= $c ;    
     }    
     //echo "$str n";    
     return $str ;    
    }    
   
   
    function qqwry ($dotip='') {    
        if( !is_string($dotip) || $dotip==''){return;}    
        if(preg_match("/^127/",$dotip)){$this->Country="本地网络";return ;}    
        elseif(preg_match("/^192/",$dotip)) {$this->Country="局域网";return ;}    
   
     $nRet;    
     $ip=$this->IpToInt ( $dotip );    
     $this->fp= fopen(__QQWRY__, "rb");    
     if ($this->fp == NULL) {    
         $szLocal= "OpenFileError";    
        return 1;    
   
     }    
     @fseek ( $this->fp , 0 , SEEK_SET ) ;    
     $buf=fread ( $this->fp , 8 ) ;    
     $this->FirstStartIp=ord($buf[0]) + (ord($buf[1])*256) + (ord($buf[2])*256*256) + (ord($buf[3])*256*256*256);    
     $this->LastStartIp=ord($buf[4]) + (ord($buf[5])*256) + (ord($buf[6])*256*256) + (ord($buf[7])*256*256*256);    
   
     $RecordCount= floor( ( $this->LastStartIp - $this->FirstStartIp ) / 7);    
     if ($RecordCount <= 1){    
        $this->Country="FileDataError";    
        fclose($this->fp) ;    
        return 2 ;    
     }    
   
     $RangB= 0;    
     $RangE= $RecordCount;    
     // Match ...    
     while ($RangB < $RangE-1)    
     {    
     $RecNo= floor(($RangB + $RangE) / 2);    
     $this->getStartIp ( $RecNo ) ;    
   
        if ( $ip == $this->StartIp )    
        {    
         $RangB=$RecNo ;    
         break ;    
        }    
     if ($ip>$this->StartIp)    
        $RangB= $RecNo;    
     else   
        $RangE= $RecNo;    
     }    
     $this->getStartIp ( $RangB ) ;    
     $this->getEndIp ( ) ;    
   
     if ( ( $this->StartIp <= $ip ) && ( $this->EndIp >= $ip ) ){    
        $nRet=0 ;    
        $this->getCountry ( ) ;    
        //这样不太好..............所以..........    
        $this->Local=str_replace("（我们一定要解放台湾！！！）", "", $this->Local);    
     }    
     else{    
        $nRet=3 ;    
        $this->Country='未知' ;    
        $this->Local='' ;    
     }    
     fclose ( $this->fp );    
$this->Country=preg_replace("/(CZ88.NET)|(纯真网络)/","局域网/未知",$this->Country);    
$this->Local=preg_replace("/(CZ88.NET)|(纯真网络)/","局域网/未知",$this->Local);    
//////////////看看 $nRet在上面的值是什么0和3，于是将下面的行注释掉    
        return $nRet ;    
   
     //return "$this->Country $this->Local";#如此直接返回位置和国家便可以了    
    }    
   
    function IpToInt($Ip) {    
     $array=explode('.',$Ip);    
     $Int=($array[0] * 256*256*256) + ($array[1]*256*256) + ($array[2]*256) + $array[3];    
     return $Int;    
    }    
 }    
   
/*实例演示   
$QQWry=new QQWry;   
$QQWry->QQWry("60.31.95.255");   
$country = $QQWry->Country;   
echo $QQWry->Country.",".$QQWry->Local;   
*/   
?>