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just an underscore too much. $HTTP_GET_VARS
somewhere in your webserver's error.log should be an entry "Notice: Undefined variable: _HTTP_GET_VARS in [...]\test2.php on line [...]"
if you're just testing php you might want to set error_reporting = E_ALL and display_errors = On in your php.ini. The latter applies only for the the development system and if you do not want to open the server's error.log