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,
All movements of $_get, $_post, $_cookie, $_session
$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
__METHOD__ the name of the method that stores the class where the constant resides
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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