The example in this article describes how PHP determines the IP and redirects to the corresponding city sub-station. Share it with everyone for your reference. The specific implementation method is as follows:
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class QQWry{ var $StartIP=0; var $EndIP=0; var $Country=''; var $Local=''; var $CountryFlag=0; //Identifies the Country location // 0x01, followed by 3 bytes for Country offset, no Local // 0x02, followed by 3 bytes for Country offset, followed by Local // Others, Country, Local, and Local have similar compression. Possible multiple references. 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($offset return ''; @fseek($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 $this->Country="FileDataError"; fclose($this->fp) ; return 2 ; } $RangB= 0; $RangE= $RecordCount; // Match ... while ($RangB { $RecNo= floor(($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 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='Unknown' ; $this->Local='' ; } fclose ( $this->fp ); $this->Country=preg_replace("/(CZ88.NET)|(Innocent Network)/","LAN/Unknown",$this->Country); $this->Local=preg_replace("/(CZ88.NET)|(Innocent Network)/","LAN/Unknown",$this->Local); ///////////////Look at the values 0 and 3 of $nRet above, so comment out the following lines return $nRet ; //return "$this->Country $this->Local";#Just return the location and country directly } function IpToInt($Ip) { $array=explode('.',$Ip); $Int=($array[0] * 256*256*256) ($array[1]*256*256) ($array[2]*256) $array[3]; return $Int; } } ?> |
An example demonstration is as follows:
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I hope this article will be helpful to everyone’s PHP programming design.
http://www.bkjia.com/PHPjc/973923.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/973923.htmlTechArticleHow to use PHP to determine IP and redirect to the corresponding city substation. This article mainly introduces how PHP determines IP and redirects to it. The method of jumping to the corresponding city sub-station, the example analysis of PHP URL parsing and jumping skills, has a...
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