$info = localeconv()

Array
(
    [decimal_point] => ,
    [thousands_sep] => .
    [int_curr_symbol] => EUR
    [currency_symbol] => EUR
    [mon_decimal_point] => ,
    [mon_thousands_sep] => .
    [positive_sign] =>
    [negative_sign] => -
    [int_frac_digits] => 2
    [frac_digits] => 2
    [p_cs_precedes] => 0
    [p_sep_by_space] => 1
    [n_cs_precedes] => 0
    [n_sep_by_space] => 1
    [p_sign_posn] => 1
    [n_sign_posn] => 1
    [grouping] => Array
        (
            [0] => 3
            [1] => 3
        )

    [mon_grouping] => Array
        (
            [0] => 3
            [1] => 3
        )

)

Die POSIX Erweiterung nl_langinfo() liefert noch detaillierte Informationen, z.B.

• PREGs für "Ja" und "Nein"
• Monate, Tage in der Locale
• Datum/Zeitformate für strftime()
• Alternative Kalender
• Zahlenformatierung