Set locale information


setlocale ( int $category , string $locale [, string $... ] ) : string
setlocale ( int $category , array $locale ) : string



category is a named constant specifying the category of the functions affected by the locale setting:

LC_ALLall below
LC_COLLATEstring comparison, see strcoll()
LC_CTYPEcharacter classification and conversion, for example strtoupper()
LC_NUMERICdecimal separator (See localeconv())
LC_TIMEdate and time formatting with strftime()
LC_MESSAGESsystem responses (available if PHP was compiled with libintl)

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.

Note: The return value of setlocale() depends on the system that PHP is running. It returns exactly what the system setlocale function returns.




$category = LC_ALL;
$locale = "en_US";

$return = setlocale($category, $locale);

echo $return;




$category = LC_ALL;
$locale1 = "de_DE@euro";
$locale2 = "de_DE";
$locale3 = "de";
$locale4 = "ge";

$return = setlocale($category, $locale1, $locale2, $locale3, $locale4);

echo "preferred locale: $return";

preferred locale: de_DE@euro



$category = LC_ALL;
$locale = array("de_DE@euro", "de_DE", "de", "ge");

$return = setlocale($category, $locale);

echo "preferred locale: $return";

preferred locale: de_DE@euro



$category = LC_TIME;
$locale = "nl_NL";

setlocale($category, $locale);

$format = "%A %d %B %Y";
$hour = 0;
$minute = 0;
$second = 0;
$month = 1;
$day = 1;
$year = 2000;
$timestamp = mktime($hour, $minute, $second, $month, $day, $year);
$strftime = strftime($format, $timestamp);

echo $strftime;

zaterdag 01 januari 2000