PHP中的$_SERVER['HTTP_HOST']与$_SERVER['SERVER_NAME']的区别文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
通过：$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']可以获取域名及请求的URL。文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
1、变量HTTP_HOST和SERVER_NAME都是获取当前域名文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
2、当满足以下3个条件的时候，两者会输出相同的信息文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
A、服务器端口号为80文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
B、Apache中的conf中的ServerName设置正确文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
C、HTTP/1.1协议规范文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
3、不同点文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
A、$_SERVER['HTTP_HOST']：在HTTP/1.1协议下，会根据客户端的HTTP请求输出信息；文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
$_SERVER['SERVER_NAME']：默认情况下会直接输出Apache的配置文件httpd.conf中的ServerName的值文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
B、当服务器的端口号不是80时文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
$_SERVER['HTTP_HOST']会输出端口号，例如“www.funwall.cn:8080”文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
$_SERVER['SERVER_NAME']直接输出ServerName的值，例如“www.funwall.cn”文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
在这种情况下，可以理解成HTTP_HOST = SERVER_NAME:SERVRE_PORT文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
C、当配置文件httpd.conf中的ServerName与HTTP/1.0下的域名不一致的时候，假如httpd.conf配置如下：文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
ServerName funwall.cn文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
ServerAlias www.funwall.cn文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
客户端访问域名：www.funwall.cn文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
$_SERVER[HTTP_HOST]输出：www.funwall.cn文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
$_SERVER[SERVER_NAME]输出：funwall.cn文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
因此，在实际中应该用$_SERVER[HTTP_HOST]获取域名比较保险文章源自知更鸟-https://zmingcx.com/http_host-v-erver_name.html
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