$ _ Server ['php _ Self '] # File Name of the script being executed, which is related to document root.
$ _ Server ['argv'] # parameters passed to the script.
$ _ Server ['argc '] # contains the number of command line parameters passed to the Program (if running in command line mode ).
$ _ Server ['Gateway _ interface'] # The CGI standard version used by the server. For example, CGI/1.1 ".
$ _ Server ['server _ name'] # Name of the server host where the script is currently running.
$ _ Server ['server _ soft'] # The string identified by the server, which is provided in the header of the Response Request.
$ _ Server ['server _ Protocol'] # name and version of the communication protocol used to request the page. For example, "HTTP/1.0 ".
$ _ Server ['request _ method'] # Request Method for accessing the page. For example, "get", "head", "Post", and "put ".
$ _ Server ['query _ string'] # query string.
$ _ Server ['document _ root'] # root directory of the document where the script is currently running. Defined in the server configuration file.
$ _ Server ['HTTP _ Accept '] # accept of the current request: Content in the header.
$ _ Server ['HTTP _ accept_charset '] # accept-charset of the current request: Content in the header. Example: "iso-8859-1, *, UTF-8 ".
$ _ Server ['HTTP _ accept_encoding '] # accept-encoding of the current request: Content in the header. For example, "gzip ".
$ _ Server ['HTTP _ accept_language '] # accept-language of the current request: Content in the header. For example, "en ".
$ _ Server ['HTTP _ connection'] # connection of the current request: Content in the header. For example, "keep-alive ".
$ _ Server ['HTTP _ host'] # host of the current request: Content in the header.
$ _ Server ['HTTP _ referer'] # link to the URL of the previous page of the current page.
$ _ Server ['HTTP _ user_agent '] # user_agent of the current request: Content in the header.
$ _ Server ['https']-If accessed through https, it is set to a non-null value (on); otherwise, off is returned.
$ _ Server ['remote _ ADDR '] # the IP address of the user on the current page is being viewed.
$ _ Server ['remote _ host'] # The Host Name of the user browsing the current page.
$ _ Server ['remote _ port'] # The port used by the user to connect to the server.
$ _ Server ['script _ filename'] # the absolute path name of the currently executed script.
$ _ Server ['server _ admin'] # administrator Information
$ _ Server ['server _ port'] # port used by the server
$ _ Server ['server _ signature '] # a string containing the server version and virtual host name.
$ _ Server ['path _ translated '] # basic path of the file system where the current script is located (not the root directory of the document.
$ _ Server ['script _ name'] # contains the path of the current script. This is useful when the page needs to point to itself.
$ _ Server ['request _ URI '] # URI required to access this page. For example, "/index.html ".
$ _ Server ['php _ auth_user '] # 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 '] # when PHP runs in the Apache module mode and is using the HTTP authentication function, this variable is the password entered by the user.
$ _ Server ['auth _ type'] # when PHP runs in the Apache module mode and is using the HTTP authentication function, this variable is the authentication type