[php-src] Issue #14489: msgfmt_format_message() can't parses body contains a key starting with &

Issue: https://github.com/php/php-src/issues/14489 Author: erickmcarvalho ### Description ## Description Hello everyone. We noticed the intl message formatter couldn't parse a string containing keys ({, }) and then & character, e.g. blah blah blah {&foo} blah blah blah. Strings containing only keys, like {foo} it's okay, but when following any special characters like #, $, %, &, @, etc., isn't possible to parse it. I'm not sure if it's an expected behavior, so if you guys can confirm to me if it's a bug or it's ok, in this case, we should treat it on our codebase. The following code: ```php <?php var_dump(MessageFormatter::formatMessage('en', '{&quality}"', [])); var_dump(MessageFormatter::formatMessage('en', '{@quality}"', [])); var_dump(MessageFormatter::formatMessage('en', '{#quality}"', [])); var_dump(MessageFormatter::formatMessage('en', '{$quality}"', [])); ``` Resulted in this output: ``` bool(false) bool(false) bool(false) bool(false) ``` But I expected this output instead: ``` string(10) "{&quality}"" string(10) "{@quality}"" string(10) "{#quality}"" string(10) "{$quality}"" ``` Thanks. ### PHP Version PHP 8.1.28 ### Operating System Docker php:8.1-fpm