On, Off 开关内置协程, 默认开启
设置AIO异步文件读写的线程数量，默认为2
关闭/开启Swoole错误信息，默认开启
设置进程间通信的Socket缓存区尺寸，默认为8M
swoole_server中的task功能中是否使用swoole_serialize对异步任务数据序列化
是否启用短别名。
| 下划线类名风格 | 命名空间风格 |
|---|---|
| swoole_server | Swoole\Server |
| swoole_client | Swoole\Client |
| swoole_process | Swoole\Process |
| swoole_timer | Swoole\Timer |
| swoole_table | Swoole\Table |
| swoole_lock | Swoole\Lock |
| swoole_atomic | Swoole\Atomic |
| swoole_buffer | Swoole\Buffer |
| swoole_redis | Swoole\Redis |
| swoole_event | Swoole\Event |
| swoole_mysql | Swoole\MySQL |
| swoole_mmap | Swoole\Mmap |
| swoole_channel | Swoole\Channel |
| swoole_serialize | Swoole\Serialize |
| swoole_http_server | Swoole\Http\Server |
| swoole_http_client | Swoole\Http\Client |
| swoole_http_request | Swoole\Http\Request |
| swoole_http_response | Swoole\Http\Response |
| swoole_websocket_server | Swoole\WebSocket\Server |
需要swoole-1.8.1或更高版本