Descriptionstring setlocale ( int category, string locale [, string ...] )
string setlocale ( int category, array locale )
Sets locale information.
categoryis 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)
localeis 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".
localeis "0", the locale setting is not affected, only the current setting is returned.
localeis 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.
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.
Note: The return value of setlocale() depends on the system that PHP is running. It returns exactly what the system setlocale function returns.
Example 2. setlocale() Examples for Windows
The locale information is maintained per process, not per thread. If you are running PHP on a multithreaded server api like IIS or Apache on Windows you may experience sudden changes of locale settings while a script is running although the script itself never called setlocale() itself. This happens due to other scripts running in different threads of the same process at the same time changing the processwide locale using setlocale().
Tip: Windows users will find useful information about
localestrings at Microsoft's MSDN website. Supported language strings can be found at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt_language_strings.asp and supported country/region strings at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt_country_strings.asp. Windows systems support the three letter codes for country/region specified by ISO 3166-Alpha-3, which can be found at this Unicode website.