When running Alpine 3.6 with PHP 7.1.9 and the WP-CLI 1.3.0 I receive the following PHP NOTICE:

PHP Notice: Use of undefined constant GLOB_BRACE - assumed 'GLOB_BRACE' in phar:///bin/wp/php/utils.php on line 915

It is only a notice, but is also extra unexpected output on the cli. Google-fu returned this which might be related: zendframework/zend-stdlib#58