PHP控制电脑重启 关机

<?php

if (isset($_POST['cmd']))

{

    $cmd = stripslashes($_POST['cmd']);

    exec($cmd, $out);

    var_dump($out);

    echo '<br>';

    var_dump($cmd);

} else

{

?>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<form action="shutdown.php" method="post" name="form0" id="form0">

<p> </p>

<p align="center" >CMD</p>

<table width="200" border="0" align="center">

<tr>

<td width="81" height="18">选择:</td>

<td width="109"><select name="cmd">

<option value="shutdown -r" selected="selected">重启计算机</option>

<option value="shutdown -s">关闭计算机</option>

<option value="shutdown -l">注销当前用户</option>

</select></td>

</tr>

<tr>

<td> </td>

<td><input type="submit" name="Submit" value="提交" /></td>

</tr>

</table>

<p> </p>

</form>

<?php

}

?>