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PUM_Utils_I10n::map_locale( string $lang, string $region )

	public static function map_locale( $lang, $region ) {
		$uregion  = strtoupper( $region );
		$ulang    = strtoupper( $lang );
		$variants = array(
			"$lang-$region",
			"{$lang}_$region",
			"$lang-$uregion",
			"{$lang}_$uregion",
			"{$lang}_$ulang",
			$lang,
		);

		$available_locales = self::available_locales();

		$available_locales = array_keys( $available_locales );

		foreach ( $variants as $variant ) {
			if ( in_array( $variant, $available_locales ) ) {
				return $variant;
			}
		}

		foreach ( $available_locales as $locale ) {
			list( $locale_lang, ) = preg_split( '/[_-]/', $locale );
			if ( $lang === $locale_lang ) {
				return $locale;
			}
		}

		return false;
	}