$ _ SERVER ['php _ SELF '] function usage # File Name of the script being executed, which is related to document root.
$ _ SERVER ['argv'] function usage # parameters passed to the script.
$ _ SERVER ['argc '] function usage # contains the number of command line parameters passed to the Program (if running in command line mode ).
$ _ SERVER ['Gateway _ interface'] function usage # The CGI standard version used by the SERVER. For example, "CGI/1.1 ".
$ _ SERVER ['server _ name'] function usage # NAME of the SERVER host where the script is currently running.
$ _ SERVER ['server _ soft'] function usage # string identified by the SERVER, which is provided in the header of the Response Request.
$ _ SERVER ['server _ Protocol'] function usage # name and version of the communication PROTOCOL when requesting the page. For example, "HTTP/1.0 ".
$ _ SERVER ['request _ method'] function usage # request method when accessing the page. For example, "GET", "HEAD", "POST", and "PUT ".
$ _ SERVER ['query _ string'] function usage # query string.
$ _ SERVER ['document _ root'] function usage # ROOT directory of the DOCUMENT where the script is currently running. Defined in the server configuration file.
$ _ SERVER ['HTTP _ ACCEPT '] function usage # Accept of the current request: Content in the header.
$ _ SERVER ['HTTP _ ACCEPT_CHARSET '] function usage # Accept-Charset of the current request: Content in the header. Example: "iso-8859-1, *, UTF-8 ".
$ _ SERVER ['HTTP _ ACCEPT_ENCODING '] function usage # Accept-Encoding of the current request: Content in the header. For example, "gzip ".
$ _ SERVER ['HTTP _ ACCEPT_LANGUAGE '] function usage # Accept-Language of the current request: Content in the header. For example, "en ".
$ _ SERVER ['HTTP _ connection'] function usage # CONNECTION of the current request: Content in the header. For example, "Keep-Alive ".
$ _ SERVER ['HTTP _ host'] function usage # HOST of the current request: Content in the header.
$ _ SERVER ['HTTP _ referer'] function usage # link to the URL of the previous page of the current page.
$ _ SERVER ['HTTP _ USER_AGENT '] function usage # User_Agent of the current request: Content in the header.
$ _ SERVER ['remote _ ADDR '] function usage # browsing the IP address of the user on the current page.
$ _ SERVER ['remote _ host'] function usage # The HOST Name of the user browsing the current page.
$ _ SERVER ['remote _ port'] function usage # PORT used by the user to connect to the SERVER.
$ _ SERVER ['script _ filename'] function usage # the absolute path name of the currently executed SCRIPT.
$ _ SERVER ['server _ admin'] function usage # administrator information.
$ _ SERVER ['server _ port'] function usage # PORT used by the SERVER.
$ _ SERVER ['server _ SIGNATURE '] function usage # a string containing the SERVER version and virtual host name.
$ _ SERVER ['path _ TRANSLATED '] function usage # basic PATH of the file system where the current script is located (not the root directory of the document.
$ _ SERVER ['script _ name'] function usage # contains the path of the current SCRIPT. This is useful when the page needs to point to itself.
$ _ SERVER ['request _ URI '] function usage # URI required to access this page. For example, "/index.html ".
$ _ SERVER ['php _ AUTH_USER '] function usage # when PHP runs in the Apache module mode and uses the HTTP authentication function, this variable is the user name entered by the user.
$ _ SERVER ['php _ AUTH_PW '] function usage # when PHP runs in the Apache module mode and uses the HTTP authentication function, this variable is the password entered by the user.
$ _ SERVER ['auth _ type'] function usage # when PHP runs in the Apache module mode and uses the HTTP authentication function, this variable is the authentication TYPE.
$ _ SERVER ['php _ SELF '] function usage # File Name of the script being executed, which is related to document root.