我需要将ipv6地址转换为其半字节格式,以便动态创建ptr记录.以下是我从维基百科获得的信息：
IPv6 reverse resolution
Reverse DNS lookups for IPv6 addresses
use the special domain ip6.arpa. An
IPv6 address appears as a name in this
domain as a sequence of nibbles in
reverse order,represented as
hexadecimal digits as subdomains. For
example,the pointer domain name
corresponding to the IPv6 address
2001:db8::567:89ab is
b.a.9.8.7.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa.
关于半字节我唯一能找到的就是在包函数中,http://www.php.net/pack.我找不到任何解决方案,其中包含来自谷歌搜索问题的例子.
任何帮助是极大的赞赏.
给定适当的现代版本的PHP(在Windows上为> = 5.1.0或5.3),使用inet_pton函数将IPv6地址解析为16字节数组,然后使用标准字符串操作来反转它.
$ip = '2001:db8::567:89ab';
$addr = inet_pton($ip);
$unpack = unpack('H*hex',$addr);
$hex = $unpack['hex'];
$arpa = implode('.',array_reverse(str_split($hex))) . '.ip6.arpa';