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    Locale::acceptFromHttp

    locale_accept_from_http

    (PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL intl >= 1.0.0)

    Locale::acceptFromHttp -- locale_accept_from_http — Tries to find out best available locale based on HTTP "Accept-Language" header

    Description

    Object-oriented style

    public static Locale::acceptFromHttp(string $header): string|false

    Procedural style

    locale_accept_from_http(string $header): string|false

    Tries to find locale that can satisfy the language list that is requested by the HTTP "Accept-Language" header.

    Parameters

    header

    The string containing the "Accept-Language" header according to format in RFC 2616.

    Return Values

    The corresponding locale identifier.

    Returns false when the length of header exceeds INTL_MAX_LOCALE_LEN.

    Examples

    Example #1 locale_accept_from_http() example

    <?php
    $locale     = locale_accept_from_http($_SERVER['HTTP_ACCEPT_LANGUAGE']);
    echo     $locale;
    ?>

    Example #2 OO example

    <?php
    $locale     = Locale::acceptFromHttp($_SERVER['HTTP_ACCEPT_LANGUAGE']);
    echo     $locale;
    ?>

    The above example will output:

    en_US

    See Also

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

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    User Contributed Notes

    Adam Lange
    12 years ago
    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!
    rasmus at mindplay dot dk
    7 years ago
    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
    mollasadra at g dot com
    6 years ago
    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
    bill at m$ dot com
    1 year ago
    A nice way to detect humans. Bots usually dont have this HTTP_ACCEPT_LANGUAGE set.
    bohwaz
    3 years ago
    Please note that this method can throw IntlException in some cases when the passed header string is invalid AND you have enabled exceptions. For example:

    <?php

    ini_set    ('intl.use_exceptions', 1);

    $header = 'fr-FR,fr;q=0.9,fr;q=0.9;q=0.8,en-gb;q=0.8;q=0.7,en;q=0.6,en;q=0.7;q=0.5,*;q=0.5;q=0.4';
    var_dump(locale_accept_from_http($header));

    ?>

    Returns:

    PHP Warning: Uncaught IntlException: locale_accept_from_http: failed to find acceptable locale in ...
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