What is the difference between HTTP_HOST and SERVER_NAME in PHP

##HTTP_HOST: Obtained from client request Obtain

from the HTTP request header. Example:

网站: http://www.php.cn
HTTP_HOST: www.php.cn

HTTP_SERVER: Obtained from the server name according to the host configuration.

Example:

网站: http://www.php.cn
HTTP_SERVER: Display the server name

##SERVER_NAMEIt retrieves request headers from the client. It is unreliable because its value can be modified. Syntax: $ _SERVER ['HTTP_HOST'] It provides The domain name of the host that satisfies the request. Example: localhost:8080It is based on the customer's requirement. Because it is directly related to the request, it is used in most applications. It is taken from the target host. It is a value controlled by the customer. http://www.php.cn HTTP_HOST：www.php.cn http://www.php.cn ##HTTP_HOST Example:

HTTP_HOST
It retrieves the server configuration.
It is more reliable because its value comes from the server configuration.
Syntax: $ _SERVER ['SERVER_NAME']
It provides the server name specified in the host configuration.
Example:www.google.com
It is based on the configuration of the web server.
It does not provide any information about the request at all.
It is taken from the server configuration.
It is a server-controlled value
	HTTP_SERVER：php.cn

<?php
 echo $_SERVER[&#39;HTTP_HOST&#39;];  
?>

Output:

// 它显示主机名

Example of HTTP_SERVER:

<?php 
echo $_SERVER[&#39;SERVER_NAME&#39;]; 
?>

Output:

//它显示服务器名称

Note

: For localhost, HOST and SERVER name are the same.

Related recommendations: "PHP Tutorial

"

http://www.php.cn/course/list/29.html

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