Description of commonly used values ​​in $_SERVER

Description of commonly used values ​​in $_SERVER
Use URL: http://www.pro.com/index.php?type=1&id=1
The dictation is not clear, just go to the results
[SCRIPT_NAME] => /index.php //Contains the path of the current script
[REQUEST_URI] => /index.php?type=1&id=1 //After the domain name
[QUERY_STRING] => type=1&id=1 // ?
[REQUEST_METHOD] => GET // Request method
[REQUEST_SCHEME] => http // What protocol to use
[DOCUMENT_ROOT] => E:/DemoPro // Accessed file root directory
[REMOTE_ADDR] => 127.0.0.1 // Obtain the client's IP address
[HTTP_X_FORWARDED_FOR] //It may not be possible to obtain the client's real IP address through the proxy server
[HTTP_CLIENT_IP] //It may be possible to obtain the ip address of the client and the computer where the browser is located None
[SERVER_PORT] => 80 // Server port
[SERVER_ADDR] => 127.0.0.1 // Server ip address
[SERVER_NAME] => www.pro.com // Host name

[HTTP_HOST ] => www.pro.com // If it exists, it is the content of the Host: item in the current request header,

HTTP_HOST = SERVER_NAME:SERVER_PORT (Ignored by default. If an SSL link is used, the port number will be Displayed? )

[REQUEST_TIME_FLOAT] => 1450940501.5163 //The timestamp when the request starts, microsecond level accuracy. Valid since PHP 5.4.0
[REQUEST_TIME] => 1450940501 //The timestamp when the request started. Available from PHP 5.1.0 onwards
[HTTP_USER_AGENT] => Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36
Official documentation http://php. net/manual/zh/reserved.variables.server.php

The above introduces the commonly used value descriptions in $_SERVER, including relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.