php PHP获取域名
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PHP get domain name
提问by Francisc
I want to get the domain name for where the script is running. How can that be done with PHP?
I see that $_SERVER['HTTP_HOST']as well as $_SERVER['SERVER_NAME']contain this information.
Will that variable always work and should I use one over the other?
我想获取运行脚本的域名。如何用 PHP 做到这一点？我看到$_SERVER['HTTP_HOST']并$_SERVER['SERVER_NAME']包含此信息。该变量是否总是有效，我应该使用一个而不是另一个吗？
Thank you.
谢谢你。
回答by Mukesh Chapagain
Similar question has been asked in stackoverflow before.
之前在stackoverflow中也有人问过类似的问题。
See here: PHP $_SERVER['HTTP_HOST'] vs. $_SERVER['SERVER_NAME'], am I understanding the man pages correctly?
请参阅此处：PHP $_SERVER['HTTP_HOST'] 与 $_SERVER['SERVER_NAME']，我是否正确理解手册页？
Also see this article: http://shiflett.org/blog/2006/mar/server-name-versus-http-host
另见这篇文章：http: //shiflett.org/blog/2006/mar/server-name-versus-http-host
Recommended using HTTP_HOST, and falling back on SERVER_NAME only if HTTP_HOST was not set. He said that SERVER_NAME could be unreliable on the server for a variety of reasons, including:
- no DNS support
- misconfigured
- behind load balancing software
推荐使用 HTTP_HOST，只有在没有设置 HTTP_HOST 时才回退到 SERVER_NAME。他说，由于多种原因，SERVER_NAME 在服务器上可能不可靠，包括：
- 不支持 DNS
- 配置错误
- 负载均衡软件背后
回答by xzyfer
To answer your question, these should work as long as:
要回答您的问题，只要满足以下条件，这些方法就应该有效：
- Your HTTP server passes these values along to PHP (I don't know any that don't)
- You're notaccessing the script via command line (CLI)
- 您的 HTTP 服务器将这些值传递给 PHP（我不知道任何不知道的值）
- 您不是通过命令行 (CLI) 访问脚本
But, if I remember correctly, these values can be faked to an extent, so it's best not to rely on them.
但是，如果我没记错的话，这些值在一定程度上是可以伪造的，所以最好不要依赖它们。
My personal preference is to set the domain name as an environment variablein the apache2 virtual host:
我个人的偏好是在apache2虚拟主机中将域名设置为环境变量：
# Virtual host
setEnv DOMAIN_NAME example.com
And read it in PHP:
// PHP
echo getenv(DOMAIN_NAME);
This, however, isn't applicable in all circumstances.
然而，这并不适用于所有情况。
