How to determine the IP and jump to the corresponding city sub-station with PHP, ip sub-station_PHP tutorial

How PHP determines the IP and redirects to the corresponding city sub-station, ip sub-station

The example in this article describes the method of PHP determining the IP and redirecting to the corresponding city sub-station. Share it with everyone for your reference. The specific implementation method is as follows:

<&#63;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 )&#63; '' : $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;
  }
 }
&#63;>

An example demonstration is as follows:

$QQWry=new QQWry;
$QQWry->QQWry("60.31.95.255");
$country = $QQWry->Country;
echo $QQWry->Country.",".$QQWry->Local;

I hope this article will be helpful to everyone’s PHP programming design.

http://www.bkjia.com/PHPjc/973286.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/973286.htmlTechArticleHow PHP determines the IP and jumps to the corresponding city sub-station. The ip sub-station is an example of how PHP determines the IP. And jump to the corresponding city branch method. Share it with everyone for your reference. Specific implementation method...