PHP obtains server information from clients and PHP.

Server variable $ _ server details:

1. $ _ session ['php _ Self '] -- get the file name of the script being executed

2. $ _ server ['server _ Protocol'] -- name and version of the communication protocol when requesting the page. For example, "HTTP/1.0 ".

3. $ _ server ['request _ time'] -- the timestamp at the start of the request. Valid from PhP 5.1.0. The same effect as the time function.

4. $ _ server ['argv'] --
Parameters passed to the script. I tried the get method to get $ _ server ['argv'] [0]. The post method cannot assign a value to him.

5. $ _ server ['server _ name'] -- returns the current host name.

6. $ _ server ['server _ soft'] -- the string of the server identifier, which is provided in the header information in the Response Request.
For example, Microsoft-IIS/6.0

7. $ _ server ['request _ method'] -- the request method used to access the page. For example, "get", "head", "Post", and "put ".

8. $ _ server ['query _ string'] -- query string (the first question mark in the URL? ).

9. $ _ server ['document _ root'] -- the root directory of the document where the script is currently running. Defined in the server configuration file. E:/Server

10. $ _ server ['HTTP _ Accept '] -- accept of the current request: header information.

11. $ _ server ['HTTP _ accept_charset '] -- accept-charset of the current request:
Header information. Example: "iso-8859-1, *, UTF-8 ".

12. $ _ server ['HTTP _ accept_encoding '] -- accept-encoding of the current request:
Header information. For example, "gzip ".

13. $ _ server ['HTTP _ accept_language '] -- accept-language of the current request:
Header information. For example, "en ".

14. $ _ server ['HTTP _ connection'] -- connection of the current request:
Header information. For example, "keep-alive ".

15. $ _ server ['HTTP _ host'] -- Host of the current request: header information.

16. $ _ server ['HTTP _ referer'] -- link to the URL of the previous page of the current page.

17. $ _ server ['HTTP _ user_agent '] -- return the browser information used by the user. You can also use get_browser () to obtain this information.

18. $ _ server ['https'] -- If accessed through https, it is set to a non-null value; otherwise, off is returned.

19. $ _ server ['remote _ ADDR '] -- browsing the IP address of the user on the current page.

20. $ _ server ['remote _ host'] -- the host name of the user on the current page is being viewed. Reverse Domain name resolution is based on the user's
Remote_addr. If the local test returns 127.0.0.1

21. $ _ server ['remote _ port'] -- the port used by the user to connect to the server. I did not pass the test on the local machine. I don't know why.

22. $ _ server ['script _ filename'] -- the absolute path name of the currently executed script. E:/Server/index. php

23. $ _ server ['server _ admin'] -- This value specifies server_admin in the Apache server configuration file.
Parameters. If the script runs on a VM, the value is the value of that VM.

24. $ _ server ['server _ port'] -- the port used by the server. The default value is "80 ". If SSL secure connection is used, the value is the HTTP
Port.

25. $ _ server ['server _ signature '] -- a string containing the server version and virtual host name.

26. $ _ server ['path _ translated '] --
The basic path of the file system (not the document root directory) where the current script is located. This is the result of a virtual image to a real path on the server. Apache 2 users can use
Acceptpathinfo on to define path_info.

27. $ _ server ['script _ name'] -- contains the path of the current script. This is useful when the page needs to point to itself. _ File __
Contains the absolute path and file name of the current file (for example, including the file ).

28. $ _ server ['request _ URI '] -- URI required to access this page. For example, "/index.html ".

29. $ _ server ['php _ auth_digest '] -- when running as an Apache module, perform HTTP Digest
During authentication, this variable is set to the "Authorization" HTTP header content sent by the client (For further authentication ).

30. $ _ server ['php _ auth_user '] -- when PHP runs in Apache or IIS (PHP 5 is
ISAPI) module, and the HTTP authentication function is in use. This variable is the user name entered by the user.

31. $ _ server ['php _ auth_pw '] -- when PHP runs in Apache or IIS (PHP 5 is
ISAPI) module and HTTP authentication is in use. This variable is the password entered by the user.

32. $ _ server ['auth _ type'] -- when PHP runs in the Apache module mode and is using HTTP
Authentication function. This variable is the authentication type.