<?php

// echo '0 * * * * echo "" > /var/log/nginx/access.log' >> /etc/crontabs/root

// grep -qxF "* * * * * echo \"\" > /var/log/nginx/access.log" /etc/crontabs/root || echo "* * * * * echo \"\" > /var/log/nginx/access.log" >> /etc/crontabs/root

// grep -qxF '0 * * * * echo "" > /var/log/nginx/access.log' /etc/crontabs/root || echo '0 * * * * echo "" > /var/log/nginx/access.log' >> /etc/crontabs/root

$command = "0 * * * * echo \\\"\\\" > /var/log/nginx/access.log";
$output = "grep -qxF \"$command\" /etc/crontabs/root || echo \"$command\" >> /etc/crontabs/root";
exec($output)."\n";

$command = "30 0 * * * /etc/init.d/php7-fpm restart";
$output = "grep -qxF \"$command\" /etc/crontabs/root || echo \"$command\" >> /etc/crontabs/root";

exec($output)."\n";
exec("/etc/init.d/cron restart");