PHP根据IP地址获取所在城市具体实现

文件目录：

ipLocation

-----qqwry

----------QQWry.Dat

-----ipCity.class.php

ipCity.class.php文件代码：

代码如下:

<?php

class ipCity {

/**

* 根据ip地址获取对应所在城市

* @param type $userip 用户IP地址

* @return string

*/

public function getCity( $userip, $dat_path = '' ) {

//IP数据库路径，这里用的是QQ IP数据库 20110405 纯真版

empty( $dat_path ) && $dat_path = FCPATH . 'plugin/ipLocation/qqwry/QQWry.Dat';

//判断IP地址是否有效

if ( preg_match( "/^([0-9]{1,3}.){3}[0-9]{1,3}$/", $userip ) == 0 ) {

return 'IP Address Invalid';

}

//打开IP数据库

if ( !$fd = @fopen( $dat_path, 'rb' ) ) {

return 'IP data file not exists or access denied';

}

//explode函数分解IP地址，运算得出整数形结果

$userip = explode( '.', $userip );

$useripNum = $userip[0] * 16777216 + $userip[1] * 65536 + $userip[2] * 256 + $userip[3];

//获取IP地址索引开始和结束位置

$DataBegin = fread( $fd, 4 );

$DataEnd = fread( $fd, 4 );

$useripbegin = implode( '', unpack( 'L', $DataBegin ) );

if ( $useripbegin < 0 )

$useripbegin += pow( 2, 32 );

$useripend = implode( '', unpack( 'L', $DataEnd ) );

if ( $useripend < 0 )

$useripend += pow( 2, 32 );

$useripAllNum = ($useripend - $useripbegin) / 7 + 1;

$BeginNum = 0;

$EndNum = $useripAllNum;

//使用二分查找法从索引记录中搜索匹配的IP地址记录

while ( $userip1num > $useripNum || $userip2num < $useripNum ) {

$Middle = intval( ($EndNum + $BeginNum) / 2 );

//偏移指针到索引位置读取4个字节

fseek( $fd, $useripbegin + 7 * $Middle );

$useripData1 = fread( $fd, 4 );

if ( strlen( $useripData1 ) < 4 ) {

fclose( $fd );

return 'File 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

$userip1num = implode( '', unpack( 'L', $useripData1 ) );

if ( $userip1num < 0 )

$userip1num += 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 ( $userip1num > $useripNum ) {

$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 'File Error';

}

$DataSeek = implode( '', unpack( 'L', $DataSeek . chr( 0 ) ) );

fseek( $fd, $DataSeek );

$useripData2 = fread( $fd, 4 );

if ( strlen( $useripData2 ) < 4 ) {

fclose( $fd );

return 'File Error';

}

$userip2num = implode( '', unpack( 'L', $useripData2 ) );

if ( $userip2num < 0 )

$userip2num += pow( 2, 32 );

//找不到IP地址对应城市

if ( $userip2num < $useripNum ) {

if ( $Middle == $BeginNum ) {

fclose( $fd );

return 'No Data';

}

$BeginNum = $Middle;

}

}

$useripFlag = fread( $fd, 1 );

if ( $useripFlag == chr( 1 ) ) {

$useripSeek = fread( $fd, 3 );

if ( strlen( $useripSeek ) < 3 ) {

fclose( $fd );

return 'System Error';

}

$useripSeek = implode( '', unpack( 'L', $useripSeek . chr( 0 ) ) );

fseek( $fd, $useripSeek );

$useripFlag = fread( $fd, 1 );

}

if ( $useripFlag == chr( 2 ) ) {

$AddrSeek = fread( $fd, 3 );

if ( strlen( $AddrSeek ) < 3 ) {

fclose( $fd );

return 'System Error';

}

$useripFlag = fread( $fd, 1 );

if ( $useripFlag == 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 ) )

$useripAddr2 .= $char;

$AddrSeek = implode( '', unpack( 'L', $AddrSeek . chr( 0 ) ) );

fseek( $fd, $AddrSeek );

while ( ($char = fread( $fd, 1 )) != chr( 0 ) )

$useripAddr1 .= $char;

} else {

fseek( $fd, -1, SEEK_CUR );

while ( ($char = fread( $fd, 1 )) != chr( 0 ) )

$useripAddr1 .= $char;

$useripFlag = fread( $fd, 1 );

if ( $useripFlag == 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 ) ) {

$useripAddr2 .= $char;

}

}

fclose( $fd );

//返回IP地址对应的城市结果

if ( preg_match( '/http/i', $useripAddr2 ) ) {

$useripAddr2 = '';

}

$useripaddr = "$useripAddr1 $useripAddr2";

$useripaddr = preg_replace( '/CZ88.Net/is', '', $useripaddr );

$useripaddr = preg_replace( '/^s*/is', '', $useripaddr );

$useripaddr = preg_replace( '/s*$/is', '', $useripaddr );

if ( preg_match( '/http/i', $useripaddr ) || $useripaddr == '' ) {

$useripaddr = 'No Data';

} elseif ( !$this->is_utf8( $useripaddr ) ) {

$useripaddr = iconv( 'GBK', 'UTF-8', $useripaddr );

}

return $useripaddr;

}

/**

* 判断是否我utf-8编码的字符串

* @param type $string

* @return boolean

*/

private function is_utf8( $string ) {

if ( preg_match( "/^([" . chr( 228 ) . "-" . chr( 233 ) . "]{1}[" . chr( 128 ) . "-" . chr( 191 ) . "]{1}[" . chr( 128 ) . "-" . chr( 191 ) . "]{1}){1}/", $string ) == true || preg_match( "/([" . chr( 228 ) . "-" . chr( 233 ) . "]{1}[" . chr( 128 )
. "-" . chr( 191 ) . "]{1}[" . chr( 128 ) . "-" . chr( 191 ) . "]{1}){1}$/", $string ) == true || preg_match( "/([" . chr( 228 ) . "-" . chr( 233 ) . "]{1}[" . chr( 128 ) . "-" . chr( 191 ) . "]{1}[" . chr( 128 ) . "-" . chr( 191 ) . "]{1}){2,}/", $string
) == true ) {

return true;

} else {

return false;

}

}

}

QQWry.Dat文件下载地址：http://xiazai.jb51.net/201311/yuanma/qqwry.dat(jb51.net).zip

unity3d脚本http://www.unitymanual.com/

使用演示：

代码如下:

include FCPATH . 'plugin/ipLocation/ipCity.class.php';

$city = new ipCity();

$addr = $city->getCity( '172.0.0.1' );

echo $addr; // echo 本地地址