Detailed explanation of PHP $_SERVER_PHP tutorial

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$_SERVER['HTTP_ACCEPT_LANGUAGE']//Browser language
$_SERVER[ 'REMOTE_ADDR'] //Current user IP.
$_SERVER['REMOTE_HOST'] //Current user host name
$_SERVER['REQUEST_URI'] //URL

$_SERVER['REMOTE_PORT'] //Port.
$_SERVER['SERVER_NAME'] //The name of the server host.
$_SERVER['PHP_SELF']//The file name of the script being executed
$_SERVER['argv'] //The parameters passed to the script.
$_SERVER['argc'] //The number of command line parameters passed to the program.
$_SERVER['GATEWAY_INTERFACE']//The version of the CGI specification.
$_SERVER['SERVER_SOFTWARE'] //The string of server identification
$_SERVER['SERVER_PROTOCOL'] //The name and version of the communication protocol when requesting the page
$_SERVER['REQUEST_METHOD']// Request method when accessing the page
$_SERVER['QUERY_STRING'] //Query string.
$_SERVER['DOCUMENT_ROOT'] //The document root directory where the currently running script is located
$_SERVER['HTTP_ACCEPT'] //The content of the Accept: header of the current request.
$_SERVER['HTTP_ACCEPT_CHARSET'] //Contents of the Accept-Charset: header of the current request.
$_SERVER['HTTP_ACCEPT_ENCODING'] //Contents of the Accept-Encoding: header of the current request
$_SERVER['HTTP_CONNECTION'] //Contents of the Connection: header of the current request. For example: "Keep-Alive".
$_SERVER['HTTP_HOST'] //Contents of the Host: header of the current request.
$_SERVER['HTTP_REFERER'] //The URL address of the previous page linked to the current page.
$_SERVER['HTTP_USER_AGENT'] //Contents of the User_Agent: header of the current request.
$_SERVER['HTTPS']//If accessed through https, it is set to a non-empty value (on), otherwise it returns off
$_SERVER['SCRIPT_FILENAME'] #The absolute path of the currently executing script name.
$_SERVER['SERVER_ADMIN'] #Administrator information
$_SERVER['SERVER_PORT'] #Port used by the server
$_SERVER['SERVER_SIGNATURE'] #Contains characters for the server version and virtual host name string.
$_SERVER['PATH_TRANSLATED'] #The base path of the file system (not the document root directory) where the current script is located.
$_SERVER['SCRIPT_NAME'] #Contains the path of the current script. This is useful when the page needs to point to itself.
$_SERVER['PHP_AUTH_USER'] #When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the username entered by the user.
$_SERVER['PHP_AUTH_PW'] #When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the password entered by the user.
$_SERVER['AUTH_TYPE'] #When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the authentication type

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