使用语言环境标识符找到语言的方向?
ICU(php Intl扩展)是否提供一种检测语言方向(rtl/ltr)的方法?
Does ICU (php Intl extension) provides a way to detect the direction of a language (rtl/ltr) ?
方向是脚本数据.一种语言可以使用许多脚本，而一种脚本可以被多种语言使用，所以我不确定您可以将一种语言映射到一个方向.
Direction is a script data. A language can use many scripts and a script can be used by many languages, so I'm not sure you can map a language to a direction.
即使可以，PHP也无法提供获取这些信息的方法.但是，您可以尝试 icanboogie/cldr 来查看CLDR数据是否会有用(毕竟，大多数语言仅使用一个脚本).
Even if you could, PHP provides no way to get these informations. However you can try icanboogie/cldr to see if CLDR data would be of any use (after all most languages use only one script).
You can find here a mapping between languages and scripts and here scripts data which include direction.