文件目录：
iplocation
-----qqwry
----------qqwry.dat
-----ipcity.class.php
ipcity.class.php文件代码：
复制代码 代码如下:
$useripnum || $userip2num             $middle = intval( ($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 )                 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                 $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 )                 fclose( $fd );
                return 'file error';
            }
            $dataseek = implode( '', unpack( 'l', $dataseek . chr( 0 ) ) );
            fseek( $fd, $dataseek );
            $useripdata2 = fread( $fd, 4 );
            if ( strlen( $useripdata2 )                 fclose( $fd );
                return 'file error';
            }
            $userip2num = implode( '', unpack( 'l', $useripdata2 ) );
            if ( $userip2num                 $userip2num += pow( 2, 32 );
            //找不到ip地址对应城市
            if ( $userip2num                 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 )                 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 )                 fclose( $fd );
                return 'system error';
            }
            $useripflag = fread( $fd, 1 );
            if ( $useripflag == chr( 2 ) ) {
                $addrseek2 = fread( $fd, 3 );
                if ( strlen( $addrseek2 )                     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 )                     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
使用演示：
复制代码 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
http://www.bkjia.com/phpjc/621713.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/621713.htmltecharticle文件目录： iplocation -----qqwry ----------qqwry.dat -----ipcity.class.php ipcity.class.php文件代码： 复制代码 代码如下: ?php class ipcity { /** * 根据ip地址获...