I18N::Langinfo - phpMan

NAME
    I18N::Langinfo - query locale information

SYNOPSIS
      use I18N::Langinfo;

DESCRIPTION
    The langinfo() function queries various locale information that can be
    used to localize output and user interfaces. It uses the current
    underlying locale, regardless of whether or not it was called from
    within the scope of "use locale". The langinfo() function requires one
    numeric argument that identifies the locale constant to query: if no
    argument is supplied, $_ is used. The numeric constants appropriate to
    be used as arguments are exportable from I18N::Langinfo.

    The following example will import the langinfo() function itself and
    three constants to be used as arguments to langinfo(): a constant for
    the abbreviated first day of the week (the numbering starts from Sunday
    = 1) and two more constants for the affirmative and negative answers for
    a yes/no question in the current locale.

        use I18N::Langinfo qw(langinfo ABDAY_1 YESSTR NOSTR);

        my ($abday_1, $yesstr, $nostr) =
            map { langinfo($_) } (ABDAY_1, YESSTR, NOSTR);

        print "$abday_1? [$yesstr/$nostr] ";

    In other words, in the "C" (or English) locale the above will probably
    print something like:

        Sun? [yes/no]

    but under a French locale

        dim? [oui/non]

    The usually available constants are as follows.

    *   For abbreviated and full length days of the week and months of the
        year:

            ABDAY_1 ABDAY_2 ABDAY_3 ABDAY_4 ABDAY_5 ABDAY_6 ABDAY_7
            ABMON_1 ABMON_2 ABMON_3 ABMON_4 ABMON_5 ABMON_6
            ABMON_7 ABMON_8 ABMON_9 ABMON_10 ABMON_11 ABMON_12
            DAY_1 DAY_2 DAY_3 DAY_4 DAY_5 DAY_6 DAY_7
            MON_1 MON_2 MON_3 MON_4 MON_5 MON_6
            MON_7 MON_8 MON_9 MON_10 MON_11 MON_12

    *   For the date-time, date, and time formats used by the strftime()
        function (see POSIX):

            D_T_FMT D_FMT T_FMT

    *   For the locales for which it makes sense to have ante meridiem and
        post meridiem time formats:

            AM_STR PM_STR T_FMT_AMPM

    *   For the character code set being used (such as "ISO8859-1", "cp850",
        "koi8-r", "sjis", "utf8", etc.), and for the currency string:

            CODESET CRNCYSTR

    *   For an alternate representation of digits, for the radix character
        used between the integer and the fractional part of decimal numbers,
        the group separator string for large-ish floating point numbers
        (yes, the final two are redundant with POSIX::localeconv()):

            ALT_DIGITS RADIXCHAR THOUSEP

    *   For the affirmative and negative responses and expressions:

            YESSTR YESEXPR NOSTR NOEXPR

    *   For the eras based on typically some ruler, such as the Japanese
        Emperor (naturally only defined in the appropriate locales):

            ERA ERA_D_FMT ERA_D_T_FMT ERA_T_FMT

  For systems without "nl_langinfo"
    Starting in Perl 5.28, this module is available even on systems that
    lack a native "nl_langinfo". On such systems, it uses various methods to
    construct what that function, if present, would return. But there are
    potential glitches. These are the items that could be different:

    "ERA"
        Unimplemented, so returns "".

    "CODESET"
        Unimplemented, except on Windows, due to the vagaries of vendor
        locale names, returning "" on non-Windows.

    "YESEXPR"
    "YESSTR"
    "NOEXPR"
    "NOSTR"
        Only the values for English are returned. "YESSTR" and "NOSTR" have
        been removed from POSIX 2008, and are retained here for backwards
        compatibility. Your platform's "nl_langinfo" may not support them.

    "D_FMT"
        Always evaluates to %x, the locale's appropriate date
        representation.

    "T_FMT"
        Always evaluates to %X, the locale's appropriate time
        representation.

    "D_T_FMT"
        Always evaluates to %c, the locale's appropriate date and time
        representation.

    "CRNCYSTR"
        The return may be incorrect for those rare locales where the
        currency symbol replaces the radix character. Send email to
        <mailto:perlbug AT perl.org> if you have examples of it needing to work
        differently.

    "ALT_DIGITS"
        Currently this gives the same results as Linux does. Send email to
        <mailto:perlbug AT perl.org> if you have examples of it needing to work
        differently.

    "ERA_D_FMT"
    "ERA_T_FMT"
    "ERA_D_T_FMT"
    "T_FMT_AMPM"
        These are derived by using "strftime()", and not all versions of
        that function know about them. "" is returned for these on such
        systems.

    See your nl_langinfo(3) for more information about the available
    constants. (Often this means having to look directly at the langinfo.h C
    header file.)

  EXPORT
    By default only the "langinfo()" function is exported.

BUGS
    Before Perl 5.28, the returned values are unreliable for the "RADIXCHAR"
    and "THOUSEP" locale constants.

    Starting in 5.28, changing locales on threaded builds is supported on
    systems that offer thread-safe locale functions. These include POSIX
    2008 systems and Windows starting with Visual Studio 2005, and this
    module will work properly in such situations. However, on threaded
    builds on Windows prior to Visual Studio 2015, retrieving the items
    "CRNCYSTR" and "THOUSEP" can result in a race with a thread that has
    converted to use the global locale. It is quite uncommon for a thread to
    have done this. It would be possible to construct a workaround for this;
    patches welcome: see "switch_to_global_locale" in perlapi.

SEE ALSO
    perllocale, "localeconv" in POSIX, "setlocale" in POSIX, nl_langinfo(3).

    The langinfo() function is just a wrapper for the C nl_langinfo()
    interface.

AUTHOR
    Jarkko Hietaniemi, <jhi AT hut.fi>. Now maintained by Perl 5 porters.

COPYRIGHT AND LICENSE
    Copyright 2001 by Jarkko Hietaniemi

    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.