locale - phpMan

NAME
    locale - Perl pragma to use or avoid POSIX locales for built-in
    operations

WARNING
    DO NOT USE this pragma in scripts that have multiple threads active. The
    locale is not local to a single thread. Another thread may change the
    locale at any time, which could cause at a minimum that a given thread
    is operating in a locale it isn't expecting to be in. On some platforms,
    segfaults can also occur. The locale change need not be explicit; some
    operations cause perl to change the locale itself. You are vulnerable
    simply by having done a ""use locale"".

SYNOPSIS
        @x = sort @y;      # Native-platform/Unicode code point sort order
        {
            use locale;
            @x = sort @y;  # Locale-defined sort order
        }
        @x = sort @y;      # Native-platform/Unicode code point sort order
                           # again

DESCRIPTION
    This pragma tells the compiler to enable (or disable) the use of POSIX
    locales for built-in operations (for example, LC_CTYPE for regular
    expressions, LC_COLLATE for string comparison, and LC_NUMERIC for number
    formatting). Each "use locale" or "no locale" affects statements to the
    end of the enclosing BLOCK.

    See perllocale for more detailed information on how Perl supports
    locales.

    On systems that don't have locales, this pragma will cause your
    operations to behave as if in the "C" locale; attempts to change the
    locale will fail.