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php super global variable list
$_GET[] Get the variable array submitted by the GET method
$_POST[] Get the variable array submitted by the POST method
$_COOKIE[] Gets and sets the cookie identifier of the current website
$_SESSION[] Gets the unique identifier of the current user's visit, in the form of an array, such as sessionid and custom session data
$_ENV[] Current php environment variable array
$_SERVER[] Current php server variable array
$_FILES[] Parameter values submitted to the current script when uploading files, reflected in the form of an array
$_REQUEST[] contains all requests submitted by the current script,
All actions of $_GET, $_POST, $_COOKIE, $_SESSION
$GLOBALS[] contains The reference content of all super global variables in the execution script
PHP system constants
__FILE__ The absolute path and file name of the current PHP program script
__LINE__ stores this The line number where the constant is located
__FUNCTION__ The name of the function where the constant is stored
__CLASS__ The name of the class where the constant is stored
__METHOD__ The method of the class where the constant is stored The name
PHP_VERSION stores the current PHP version number, which can also be obtained through the PHPVERSION() function.
PHP_OS stores the operating system of the current server