[RFC] Add Locale::getDisplayKeyword() and Locale::getDisplayKeywordValue()

Hi,

I am starting the vote on this RFC next Tuesday, 9 June 2026. The RFC suggests to add two new functions in the intl extension to fill in little gaps between the php interface and the ICU lib.

Best, Weilin Du
RFC: https://wiki.php.net/rfc/getdisplaykeyword_and_getdisplaykeywordvalue
2026年6月6日 星期六 下午 11:28，Weilin Du lamentxu@163.com 来信：

Hi,

I want to introduce my new RFC on adding Locale::getDisplayKeyword() and
Locale::getDisplayKeywordValue() to the intl extension, see 1.
This fills in the little gap between ICU API and php interface, as every getdisplay*
ICU API has a corresponding php inferface without uloc_getDisplayKeywordValue
and uloc_getDisplayKeyword.

Take care,
Weilin Du