本文实例讲述了PHP判断IP并转跳到相应城市分站的方法。分享给大家供大家参考。具体实现方法如下：

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..........

$this->Local=str_replace("area error", "",$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;

}

}

?>

实例演示如下：

$QQWry=new QQWry;

$QQWry->QQWry("60.31.95.255");

$country = $QQWry->Country;

echo $QQWry->Country.",".$QQWry->Local;

希望本文所述对大家的php程序设计有所帮助。