class Server
{
const PORT = 8888;
public function port()
{
//netstat -anp 2>/dev/null| grep 8888 |grep LISTEN |wc -l
$shellCommand = ‘netstat -anp 2>/dev/null| grep ‘ . self::PORT . "| grep LISTEN | wc -l";
$result = shell_exec($shellCommand);
if ($result != 1) {
//进程不存在，发送警报信息
echo ‘At ‘.date(‘Y-m-d H:i:s‘) . ‘ service process is exit‘ . PHP_EOL;
} else {
echo ‘At ‘.date(‘Y-m-d H:i:s‘) . ‘ service process is ok‘ . PHP_EOL;
}
}
}
Swoole\Timer::tick(1000, function (int $timer_id) {
(new Server)->port();
});
nohup /usr/bin/php ./Server.php > ~/test.log &
原文：http://blog.51cto.com/phpme/2335229