Gettext_Translations::nplurals_and_expression_from_header( string $header )

	function nplurals_and_expression_from_header($header) {
		if (preg_match('/^\s*nplurals\s*=\s*(\d+)\s*;\s+plural\s*=\s*(.+)$/', $header, $matches)) {
			$nplurals = (int)$matches[1];
			$expression = trim( $matches[2] );
			return array($nplurals, $expression);
		} else {
			return array(2, 'n != 1');
		}
	}