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# setlocale

setlocale -- Set locale information.

## Description

`string setlocale`(string category, string locale);

`Category` is a string specifying the category of the functions affected by the locale setting:

- LC_ALL for all of the below

- LC_COLLATE for string comparison - not currently implemented in PHP

- LC_CTYPE for character classification and conversion, for example strtoupper()

- LC_MONETARY for localeconv() - not currently implemented in PHP

- LC_NUMERIC for decimal separator

- LC_TIME for date and time formatting with strftime()

If `locale` is 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 zero or `"0"`, the locale setting is not affected, only the current setting is returned.

Setlocale returns the new current locale, or false if the locale functionality is not implemented in the plattform, the specified locale does not exist or the category name is invalid. An invalid category name also causes a warning message.

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