Description:
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When running doc-base/configure.php (as pointed in http://doc.php.net/tutorial/editing.php) for any language (en or translations), in Alpine Linux, 3 error messages are thrown, 1 notice and 2 warnings:

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$ php doc-base/configure.php --enable-xml-details
Iterating over extension specific version files... PHP Notice:  Use of undefined constant GLOB_BRACE - assumed 'GLOB_BRACE' in /php-manual/doc-base/configure.php on line 573
PHP Warning:  glob() expects parameter 2 to be long, string given in /php-manual/doc-base/configure.php on line 573
PHP Warning:  Invalid argument supplied for foreach() in /php-manual/doc-base/configure.php on line 573
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The message "All good. Saving .manual.xml… done." is shown in the end, anyway we could make these errors disappear.

Researching a little I found that this happens in Alpine Linux because seems that it doesn't support GLOB_BRACE since it is using musl libc instead of GNU libc.

> https://github.com/zendframework/zend-stdlib/issues/58

The workaround is not hard to implement (https://github.com/zendframework/zend-stdlib/pull/59):

Instead of using directly

... GLOB_BRACE ...

it's just to check if it's defined before otherwise defaults to 0, like this:

... defined('GLOB_BRACE') ? GLOB_BRACE : 0 ...

As shown above, it's the way the issue was solved in Zend Framework.

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As Alpine Linux is going to get more attention mainly because of Docker based environments because it's very lightweight (https://www.brianchristner.io/docker-is-moving-to-alpine-linux/), I guess this workaround proposed is worth to have here as well.