How to suspend/restart Linux Ubuntu from PHP script? -

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i have problem. want restart ubuntu php code can not. have tried of codes internet 

<?php shell_exec("/usr/sbin/reboot"); exec("/usr/sbin/reboot"); system("/usr/sbin/reboot"); ?>

and 

<?php shell_exec("shutdown -r"); exec("shutdown -r"); system("shutdown -r"); ?>

but of them nothing. please me. need code.

i don't recommend giving root access php user

check here: https://stackoverflow.com/a/5226760/2708670


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