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php 根据数据库ip段显示ip归属地

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Jun 13, 2016 pm 12:26 PM

ipnbspstart

php 依据数据库ip段显示ip归属地
我现在有一个数据库ipatt 三个字段 ip_start（起始IP）   ip_end（结束IP）   ip_att（IP归属地）
现在有$user_ip
我要实现ip在某个ip_start   ip_end区间时显示ip_att

假如表中包含这两条
0.0.0.0         0.255.255.255                  A
12.0.64.0    12.194.255.255                B
我希望实现
0.11.12.12               显示A
12.193.65.200        显示B

求教如何比较IP
我现在要写个 function get_ip_att($user_ip )
------解决思路----------------------
MySQL 提供有 INET_ATON 函数，用于将字符串型的 ip 转换为无符号数
php 也提供有 ip2long 函数完成此工作

$ip = ip2long('12.193.65.200');
$sql = "select * from ipatt where $ip between inet_aton(ip_start) and inet_aton(ip_end)";

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