What are the parameters of $_ SERVER in PHP

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$_ SERVER ['PHP_SELF'] # the file name of the currently executing script, related to document root.

$_ SERVER ['argv'] # parameters passed to the script.

$_ SERVER ['argc'] # contains the number of command line arguments passed to the program (if running in command line mode).

$_ SERVER ['GATEWAY_INTERFACE'] # version of the CGI specification used by the server. For example, "CGI/1.1".

$_ SERVER ['SERVER_NAME'] # the name of the server host on which the script is currently running.

$_ SERVER ['SERVER_SOFTWARE'] # the string identified by the server, given in the header when responding to the request.

$_ SERVER ['SERVER_PROTOCOL'] # the name and version of the communication protocol when the page is requested. For example, "HTTP/1.0".

$_ SERVER ['REQUEST_METHOD'] # request method when accessing the page. For example: "GET", "HEAD", "POST", "PUT".

The string of $_ SERVER ['QUERY_STRING'] # query (query).

$_ SERVER ['DOCUMENT_ROOT'] # the document root where the script is currently running. Defined in the server configuration file.

$_ SERVER ['HTTP_ACCEPT'] # the contents of the header of the currently requested Accept.

$_ SERVER ['HTTP_ACCEPT_CHARSET'] # the contents of the header of the currently requested Accept-Charset. For example: "iso-8859-1, magic, etc., 8".

$_ SERVER ['HTTP_ACCEPT_ENCODING'] # the contents of the header of the currently requested Accept-Encoding. For example: "gzip"

$_ SERVER ['HTTP_ACCEPT_LANGUAGE'] # the contents of the header of the currently requested Accept-Language. For example: "en"

$_ SERVER ['HTTP_CONNECTION'] # the contents of the header of the currently requested Connection. For example: "Keep-Alive"

$_ SERVER ['HTTP_HOST'] # the contents of the header of the currently requested Host.

$_ SERVER ['HTTP_REFERER'] # links to the URL address of the previous page of the current page.

$_ SERVER ['HTTP_USER_AGENT'] # the contents of the header of the currently requested User_Agent.

$_ SERVER ['HTTPS']-if accessed through https, it is set to a non-empty value (on), otherwise off is returned

$_ SERVER ['REMOTE_ADDR'] # browsing the IP address of the user on the current page.

$_ SERVER ['REMOTE_HOST'] # the hostname of the user browsing the current page.

$_ SERVER ['REMOTE_PORT'] # the port that the user uses when connecting to the server.

$_ SERVER ['SCRIPT_FILENAME'] # absolute pathname of the currently executing script.

$_ SERVER ['SERVER_ADMIN'] # administrator information

$_ SERVER ['SERVER_PORT'] # Port used by the server

$_ SERVER ['SERVER_SIGNATURE'] # contains a string for the server version and virtual hostname.

$_ SERVER ['PATH_TRANSLATED'] # the basic path to the file system (not the document root) where the current script resides.

$_ SERVER ['SCRIPT_NAME'] # contains the path to the current script. This is useful when the page needs to point to itself.

$_ SERVER ['REQUEST_URI'] # the URI required to access this page. For example, "/ index.html".

$_ SERVER ['PHP_AUTH_USER'] # when PHP is running in Apache module mode and is using HTTP authentication, this variable is the user name entered by the user.

$_ SERVER ['PHP_AUTH_PW'] # when PHP is running in Apache module mode and is using HTTP authentication, this variable is the password entered by the user.

$_ SERVER ['AUTH_TYPE'] # when PHP is running in Apache module mode and is using HTTP authentication, this variable is the type of authentication.

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