Swoole\Network\Server::start PHP Method

    static function start($startFunction)
    {
        if (empty(self::$pidFile)) {
            throw new \Exception("require pidFile.");
        }
        $pid_file = self::$pidFile;
        if (is_file($pid_file)) {
            $server_pid = file_get_contents($pid_file);
        } else {
            $server_pid = 0;
        }
        if (!self::$optionKit) {
            Swoole\Loader::addNameSpace('GetOptionKit', LIBPATH . '/module/GetOptionKit/src/GetOptionKit');
            self::$optionKit = new \GetOptionKit\GetOptionKit();
        }
        $kit = self::$optionKit;
        foreach (self::$defaultOptions as $k => $v) {
            //解决Windows平台乱码问题
            if (PHP_OS == 'WINNT') {
                $v = iconv('utf-8', 'gbk', $v);
            }
            $kit->add($k, $v);
        }
        global $argv;
        $opt = $kit->parse($argv);
        if (empty($argv[1]) or isset($opt['help'])) {
            goto usage;
        } elseif ($argv[1] == 'reload') {
            if (empty($server_pid)) {
                exit("Server is not running");
            }
            if (self::$beforeReloadCallback) {
                call_user_func(self::$beforeReloadCallback, $opt);
            }
            \Swoole::$php->os->kill($server_pid, SIGUSR1);
            exit;
        } elseif ($argv[1] == 'stop') {
            if (empty($server_pid)) {
                exit("Server is not running\n");
            }
            if (self::$beforeStopCallback) {
                call_user_func(self::$beforeStopCallback, $opt);
            }
            \Swoole::$php->os->kill($server_pid, SIGTERM);
            exit;
        } elseif ($argv[1] == 'start') {
            //已存在ServerPID，并且进程存在
            if (!empty($server_pid) and \Swoole::$php->os->kill($server_pid, 0)) {
                exit("Server is already running.\n");
            }
        } else {
            usage:
            $kit->specs->printOptions("php {$argv[0]} start|stop|reload");
            exit;
        }
        self::$options = $opt;
        $startFunction($opt);
    }