这样重启workerman进程是否有问题？

<?php
if (PHP_SAPI !== 'cli') {
    exit("You must run the CLI environment\n");
}
$rootPath = dirname(__DIR__);
$restartFile = $rootPath . '/runtime/restart.crontab';
if (is_file($restartFile) && unlink($restartFile)) {
    $cmd = 'cd ' . $rootPath . ' && php start.php restart -d';
    shell_exec($cmd);
    sleep(3);
}