文件目录：
iplocation
—–qqwry
———-qqwry.dat
—–ipcity.class.php
ipcity.class.php文件代码：
<?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文件可以在百度上搜索或者需要的发你邮箱来，我通过邮箱发给你。
使用演示：
include fcpath . 'plugin/iplocation/ipcity.class.php'; $city = new ipcity(); $addr = $city->getcity( '172.0.0.1' ); echo $addr; // echo 本地地址
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