PHP Super Global variables

The PHP Super global variable Array (super Global Array), also known as the PHP predefined array, is built into the PHP engine and does not need to be redefined by the developer. PHP will automatically put some data in the Super Global array when the PHP script is running.

PHP Super Global Variables list
$_get[] Get an array of variables submitted with the Get method
$_post[] Get an array of variables submitted with the POST method
$_cookie[] Get and set the COOKIE ID of the current Web site
$_session[] A unique identifier for the current user access, expressed as an array, such as SessionID and custom SESSION data
$_env[] Current PHP environment variable array
$_server[] array of current PHP server variables
$_files[] A parameter value submitted to the current script when uploading a file, as an array
$_request[] contains all requests submitted by the current script, $_get, $_post, $_cookie, $_session all actions
$GLOBALS [] contains references to all super global variables that are executing the script
PHP System Constants
__file__ the absolute path and file name of the current PHP program script
__line__ the line number where the constant is stored
__FUNCTION__ the name of the function where the constant is stored
__class__ the name of the class where the constant is stored
Php_version stores the version number of the current PHP, or it can be obtained through the phpversion () function.
Php_os Store the current server's operating system

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