PHP：根据IP地址获取所在城市

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