--TEST-- call_user_func() in combination with "Call to a member function method() on a non-object" --FILE-- <?php $comparator= null; var_dump(call_user_func([$comparator, 'compare'], 1, 2)); echo "Alive\n"; ?> --EXPECTF-- Warning: call_user_func() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in %s on line %d NULL Alive