ถ้าเป็น php มันมีคำสั่ง exec('shutdown -r');
shutdown -r — restarts
shutdown -s — shutsdown
shutdown -l — logoff
*** shutdown -t xx — where xx is number of seconds to wait till shutdown/restart/logoff
shutdown -i — gives you a dialog box to fill in what function you want to use
shutdown -a — aborts the previous shutdown command....very handy!