PHP：$_SERVER 变量：$_SERVER['HTTP_HOST'] 与 $_SERVER['SERVER_NAME']
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PHP: $_SERVER variables: $_SERVER['HTTP_HOST'] vs $_SERVER['SERVER_NAME']
提问by Eman
Possible Duplicate:
HTTP_HOST vs. SERVER_NAME
What is the difference between $_SERVER['HTTP_HOST']and $_SERVER['SERVER_NAME']??
是有什么区别$_SERVER['HTTP_HOST']和$_SERVER['SERVER_NAME']？
回答by Mike Brant
$_SERVER['SERVER_NAME']gives the value of the server name as defined in host configuration (i.e for Apache the Apache .conf file).
$_SERVER['SERVER_NAME']给出主机配置中定义的服务器名称的值（即对于 Apache，Apache .conf 文件）。
$_SERVER['HTTP_HOST']gives you the domain name through which the current request is being fulfilled and is more directly related to the request.
$_SERVER['HTTP_HOST']为您提供满足当前请求的域名，并且与请求更直接相关。
HTTP_HOSTis typically more useful in most applications in that it relates directly to the request, whereas SERVER_NAMEcould return whatever value is in the conf file and doesn't tell you anything about the request at all.
HTTP_HOST在大多数应用程序中通常更有用，因为它直接与请求相关，而SERVER_NAME可以返回 conf 文件中的任何值，并且根本不告诉您有关请求的任何信息。
I will give you an example of how HTTP_HOSTmight differ from SERVER_NAME. Say you have an host defined in Apache with ServerName of domain.comand an IP address of 1.2.3.4.
我会给你一个例子，说明HTTP_HOST可能与SERVER_NAME. 假设您在 Apache 中定义了一个主机，其 ServerName 为domain.com，IP 地址为1.2.3.4。
Let's look at two incoming request URL's and show the difference between these variables:
让我们看看两个传入的请求 URL 并显示这些变量之间的区别：
http://www.domain.com
HTTP_HOST = www.domain.com
SERVER_NAME = domain.com
http://1.2.3.4
HTTP_HOST = 1.2.3.4
SERVER_NAME = domain.com
So again, HTTP_HOST is tied more to the request, whereas SERVER_NAME is determined by server configuration.
因此，HTTP_HOST 更多地与请求相关联，而 SERVER_NAME 由服务器配置决定。
回答by Frank Farmer
HTTP_HOSTis the Host:header sent by the client. As a result, it might be a little less trustworthy. SERVER_NAMEis determined by your server's configuration, regardless of user input.
HTTP_HOST是Host:客户端发送的标头。因此，它可能不太值得信赖。 无论用户输入如何，SERVER_NAME都由服务器的配置决定。
The difference in behavior is subtle. Some good examples are demonstrated here: http://shiflett.org/blog/2006/mar/server-name-versus-http-host
行为上的差异是微妙的。这里展示了一些很好的例子：http: //shiflett.org/blog/2006/mar/server-name-versus-http-host
'SERVER_NAME' The name of the server host under which the current script is executing. If the script is running on a virtual host, this will be the value defined for that virtual host.
'HTTP_HOST' Contents of the Host: header from the current request, if there is one.
'SERVER_NAME' 正在执行当前脚本的服务器主机的名称。如果脚本在虚拟主机上运行，这将是为该虚拟主机定义的值。
'HTTP_HOST' 主机的内容：来自当前请求的标头，如果有的话。
回答by mpen
HTTP_HOST
HTTP_HOST
Contents of the Host: header from the current request, if there is one.
Host 的内容：来自当前请求的标头，如果有的话。
SERVER_NAME
SERVER_NAME
The name of the server host under which the current script is executing. If the script is running on a virtual host, this will be the value defined for that virtual host.
正在执行当前脚本的服务器主机的名称。如果脚本在虚拟主机上运行，这将是为该虚拟主机定义的值。
