I have tried to use this
require $_SERVER['DOCUMENT_ROOT'] . '/lib/MyClass.php';
But I got this message
Illegal use of $_SERVER. You must use the request class or request_var() to access input data
I have attempted to use request_var(), but it doesn't work.
How can I get "DOCUMENT_ROOT" in phpbb 3.1 ?
I have found the next decision of this problem - use filter_input instead of $_SERVER.
require filter_input(INPUT_SERVER, 'DOCUMENT_ROOT') . '/lib/MyClass.php';