查找Win CMD列（给出结果+错误）

Question

我遇到以下脚本的问题：

$ exec('mode con /status', $tmp); print_r($tmp);

它运行命令并给我结果，但我也得到每次错误消息：

The system cannot find the path specified.

我只想获得终端窗口大小$COLS x $ROWS

二手系统：PHP 5.4 + Win7

此处的测试结果：

C:\@home\Devel>C:\php\php.exe -v
PHP 5.4.13 (cli) (built: Mar 15 2013 02:05:59)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
    with Xdebug v2.2.2, Copyright (c) 2002-2013, by Derick Rethans


C:\@home\Devel>C:\php\php.exe -r "exec('mode con /status', $tmp); print_r($tmp);"
The system cannot find the path specified.
Array
(
    [0] =>
    [1] => Status for device CON:
    [2] => ----------------------
    [3] =>     Lines:          1200
    [4] =>     Columns:        160
    [5] =>     Keyboard rate:  31
    [6] =>     Keyboard delay: 0
    [7] =>     Code page:      775
    [8] =>
)

如何摆脱此错误消息！？！

感谢。