The setlocale() function sets locale information.Locale information is language, monetary, time and other information specific for a geographical area.
string setlocale ( int $category , string $locale [, string $... ] )
string setlocale ( int $category , array $locale )
Sets locale information.
category
category is a named constant specifying the
category of the functions affected by the locale setting:
LC_ALL for all of the below
LC_COLLATE for string comparison, see
strcoll()
LC_CTYPE for character classification and conversion, for
example strtoupper()
LC_MONETARY for localeconv()
LC_NUMERIC for decimal separator (See also
localeconv())
LC_TIME for date and time formatting with
strftime()
LC_MESSAGES for system responses (available if PHP was compiled with
libintl)
locale
If locale is NULL or the empty string
"", the locale names will be set from the
values of environment variables with the same names as the above
categories, or from "LANG".
If locale is "0",
the locale setting is not affected, only the current setting is returned.
If locale is an array or followed by additional
parameters then each array element or parameter is tried to be set as
new locale until success. This is useful if a locale is known under
different names on different systems or for providing a fallback
for a possibly not available locale.
...(Optional string or array parameters to try as locale settings until success.)
Returns the new current locale, or FALSE if the locale functionality is not implemented on your platform, the specified locale does not exist or the category name is invalid.
An invalid category name also causes a warning message. Category/locale names can be found in » RFC 1766 and » ISO 639. Different systems have different naming schemes for locales.