问题描述
我正在使用IP2Location数据库查找IPv6地址的国家/地区代码.它们具有方法,可将IPv6地址转换为可以使用的(大)数字查询他们的数据库.
I'm using the IP2Location database to find country codes for IPv6 addresses. They have a method to convert an IPv6 address to a (large) number which can be used to query their database.
$ipv6 = '2404:6800:4001:805::1006';
$int = inet_pton($ipv6);
$bits = 15;
$ipv6long = 0;
while($bits >= 0){
$bin = sprintf("%08b", (ord($int[$bits])));
if($ipv6long){
$ipv6long = $bin . $ipv6long;
}
else{
$ipv6long = $bin;
}
$bits--;
}
$ipv6long = gmp_strval(gmp_init($ipv6long, 2), 10);
在这种情况下,$ipv6long
为4787508642609817793433434904901313196294.
In this case, $ipv6long
would be 47875086426098177934326549022813196294.
现在我想知道这样的数字是否可以还原为地址的IPv6字符串表示形式.如果可以,怎么办?
Now Im wondering whether such a number can be reverted to the IPv6 string representation of the address. And if so, how?
推荐答案
可以格式化IPv6地址,但是您需要先转换为打包字符串(16个字符串,其中每个字符都是数字的一个字节).
inet_ntop()
can format IPv6 addresses, but you need to convert to a packed string first (a 16 character string where each character is one byte of the number).
function ipv6number2string($number) {
// convert to hex
$hex = gmp_strval(gmp_init($number, 10), 16);
// pad to 32 chars
$hex = str_pad($hex, 32, '0', STR_PAD_LEFT);
// convert to a binary string
$packed = hex2bin($hex);
// convert to IPv6 string
return inet_ntop($packed);
}
echo ipv6number2string(47875086426098177934326549022813196294);
这篇关于将数字还原为IPv6字符串表示形式的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!