问题描述
我正在尝试（或者只是找到一个现有的）PHP方法，它可以链接并提取url。诀窍在于，它需要承受奇怪的域名的重量，如：
I'm trying to write (or just find an existing) PHP method that can take a link and extract the url. The trick is, it needs to hold under the weight of strange looking domains like:
www.champa.kku.ac.th
我用人的眼睛看着这个人，我还是猜测不正确：认为域将是 kku.ac.th 但是访问时会出现dns错误。
Looking at this one myself with human eyes, I still guessed it incorrectly: thought the domain would be kku.ac.th but that gives a dns error when visiting.
所以任何人都知道从url可靠地提取域名的好方法：
So anyone knows of a good way to reliably extract the domain from url:
http://site.com/hello.php
http://site.com.uk/hello.php
http://subdomain.site.com/hello.php
http://subdomain.site.com.uk/hello.php
http://www.champa.kku.ac.th/hello.php // and even the one I couldn't tell
推荐答案
PHP具有功能，将帮助您将基本拆分成协议，主机，端口等。
PHP has the parse_url() function that will help you do the basic splitting into protocol, host, port, and so on.
为了在不确定的情况下提取正确的域名，这是非常难以告诉的，因为有时候，两部分TLD是TLD权限（例如在英国）的措施，有时候是私人企业（例如 .uk.com ）。我想你不会在维护名单上列出两个部分，如
As to extracting the "right" domain in uncertain cases, this is extremely hard to tell because sometimes, "two-part TLDs" are a measure by the TLD authority (e.g. in the UK) and sometimes are private enterprises (e.g. .uk.com). I think you won't get around maintaining lists of top level domains that have two parts like
- .co.uk
- .ac.uk
- .ac.th
将被视为TLD（顶级级域），吞咽第二部分。
those endings would be treated like TLDs (Top level domains), swallowing the second part.
这是可靠地将两部分TLD分开的唯一方法，如 .co.uk - 其中 server1.ibm.co.uk （需要删除两部分 .co.uk 以确定域名本身）从 server1.ibm.com （其中 .com 需要删除的常规子域）。
This is the only way of reliably telling apart "two-part TLDs" like .co.uk - where server1.ibm.co.uk (where the two-part .co.uk needs to be removed to determine the domain itself) from regular sub-domains like server1.ibm.com (where .com needs to be removed).
获取许多重要的两部分TLD列表的一个好的起点是在speednames.com的域名搜索（在国家中选择全部）。可以找到更完整的列表，如。
A good starting point to get a list of many important "two-part TLDs" is the domain search at speednames.com (select "all" in countries). A more complete list can be found as part of the Ruby domainatrix library.
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