Can I turn Off computer using PHP script

[k2swap]

Can I turn off a computer using a PHP script?

[Atli]

You can turn off the server computer, sure. Just use the exec function to execute the shutdown command for your OS. (The exact command varies between OSs).

For example, for a Linux server, you could do:

exec("shutdown -P now");

This, obviously, requires that PHP (or Apache, if PHP is run as an Apache module) is run by a user that is allowed to use that command. If not, you will not be able to do this.

If you are trying to shut down the computer's of a client (website visitor) then no, you can not. It's just basic security.