--TEST-- Bug #63206 Fully support exception_handler stacking, even with null --FILE-- <?php set_exception_handler(function() { echo 'First handler' . PHP_EOL; }); set_exception_handler(function() { echo 'Second handler' . PHP_EOL; }); set_exception_handler(null); set_exception_handler(function() { echo 'Fourth handler' . PHP_EOL; }); restore_exception_handler(); restore_exception_handler(); throw new Exception(); ?> --EXPECTF-- Second handler