src/Server.php
protected static function create(string $app) {
        if (self::$_status > self::_STATUS_INITIAL) {
            Console::warning('Cannot create application once the service is started.');
            return;
        }
        if (isset(self::$_apps[$app]))
            Console::fatal("Failed to create app. App \"$app\" exists!");
    }
protected static function create(string $app) {
        if (self::$_status > self::_STATUS_INITIAL) {
            Console::warning('Cannot create application once the service is started.');
            return;
        }
        if (isset(self::$_apps[$app]))
            Console::fatal("Failed to create app. App \"$app\" exists!");
    }
注册服务

@param string $app