public static function add2(& $arg1, $arg2, $scale = null) : string {
		$arg1 = self::add($arg1, $arg2, $scale);
		return $arg1;
	}
public static function add2(& $arg1, $arg2, $scale = null) : string {
		$arg1 = self::add($arg1, $arg2, $scale);
		return $arg1;
	}
public static function add2 ( & $ arg1 , $ arg2 , $ scale = null ) : string { $ arg1 = self :: add ( $ arg1 , $ arg2 , $ scale ) ; return $ arg1 ; }
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@param string $arg1
@param string $arg2
@param int $scale
@return string
Add with reference