Online PHP editor | refs for YK9T1

<?php var_dump(dirname('')); var_dump(dirname('/')); var_dump(dirname('\\')); var_dump(dirname('a')); var_dump(dirname('1/2')); var_dump(dirname('./')); var_dump(dirname('', 2)); var_dump(dirname('/', 2)); var_dump(dirname('\\', 2)); var_dump(dirname('a', 2)); var_dump(dirname('1/2', 2)); var_dump(dirname('./', 2));