Locale::acceptFromHttp()

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0)

尝试基于HTTP“Accept Language”头找出最佳可用区域设置r

说明

尝试查找能够满足HTTP“Accept language”头请求的语言列表的区域设置

参数

根据RFC 2616中的格式，包含“接受语言”头的字符串。

返回值

相应的区域设置标识符。

范例

locale_accept_from_http() example

OO example

以上例程会输出：

en_US

参见

• locale_lookup() Searches the language tag list for the best match to the language

It's good to mention that if user browser will not send HTTP_ACCEPT_LANGUAGE, the output from:
 Locale::acceptFromHttp($_SERVER['HTTP_ACCEPT_LANGUAGE']);
Will be null. 
So remember to set up a fail over scenario!

If you're struggling to figure out how to use this function in a project that only supports certain languages, move along.
Unfortunately, this function doesn't let you specify languages supported by your project - and since the internal header parsing and negotiation logic isn't exposed in any other way, you'll most likely want to ditch this function and go for a custom implementation of the same thing:
https://github.com/willdurand/Negotiation

Didn't see this being documented anywhere and the bug hasn't been addressed yet, so to save headache for otherS, this method does a little weird thing with these different locales:
php > echo locale_accept_from_http("zh_TW");
zh
php > echo locale_accept_from_http("zh_CN");
zh

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