PHP Global Variables What is a super global variable

There are many hyper-global variables in PHP, which means they are available in all scopes of a script. There is no need to perform a global $variable in a function or method; You can access them.

These hyper-global variables are:

• $GLOBALS referencing all variables available in the global scope

• $_server This hyper-global variable holds information about the header, path, and location of the script.

• The most important elements that can be accessed in the $_server:

  element/code	Description
  $_server[' Php_self ']	Returns the file name of the current execution script.
  $_server[' Gateway_interface ']	Returns the version of the CGI specification used by the server.
  $_server[' Server_addr ']	Returns the IP address of the server where the script is currently running.
  $_server[' server_name ']	Returns the host name (such as www.w3school.com.cn) of the server on which the current run script resides.
  $_server[' Server_software ']	Returns the server identification string (such as apache/2.2.24).
  $_server[' Server_protocol ']	Returns the name and version of the communication protocol when the page is requested (for example, "http/1.0").
  $_server[' Request_method ']	Returns the request method used by the access page (for example, POST).
  $_server[' Request_time ']	Returns the timestamp at the start of the request (for example, 1577687494).
  $_server[' query_string ']	Returns the query string, if this page is accessed through a query string.
  $_server[' Http_accept ']	Returns the request header from the current request.
  $_server[' Http_accept_charset ']	Returns the Accept_charset header from the current request (for example, utf-8,iso-8859-1)
  $_server[' Http_host ']	Returns the Host header from the current request.
  $_server[' Http_referer ']	Returns the full URL of the current page (unreliable because it is not supported by all user agents).
  $_server[' HTTPS ']	Whether the script is queried through the secure HTTP protocol.
  $_server[' REMOTE_ADDR ']	Returns the IP address of the user who browsed the current page.
  $_server[' Remote_host ']	Returns the host name of the user who browsed the current page.
  $_server[' Remote_port ']	Returns the port number used to connect to the WEB server on the user's machine.
  $_server[' Script_filename ']	Returns the absolute path of the current execution script.
  $_server[' Server_admin ']	This value indicates the Server_admin parameter in the Apache server configuration file.
  $_server[' Server_port ']	The port used by the WEB server. The default value is "80".
  $_server[' Server_signature ']	Returns the server version and the virtual host name.
  $_server[' path_translated ']	The base path of the file system (not the document root) where the current script resides.
  $_server[' Script_name ']	Returns the path of the current script.
  $_server[' Script_uri ']	Returns the URI of the current page.

• $_request is used to collect data submitted by HTML forms.

• $_post is used to collect form data after submitting an HTML form that submits method= "post". $_post are also commonly used to pass variables.

• $_get is used to collect form data after the submission of an HTML form (method= "GET").

  $_get can also collect the data sent in the URL.

• $_files

• $_env

• $_cookie

• $_session