下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。
SWOOLE_BASE
(integer)
SWOOLE_THREAD
(integer)
SWOOLE_PROCESS
(integer)
SWOOLE_IPC_UNSOCK
(integer)
SWOOLE_IPC_MSGQUEUE
(integer)
SWOOLE_IPC_PREEMPTIVE
(integer)
SWOOLE_SOCK_TCP
(integer)
SWOOLE_SOCK_TCP6
(integer)
SWOOLE_SOCK_UDP
(integer)
SWOOLE_SOCK_UDP6
(integer)
SWOOLE_SOCK_UNIX_DGRAM
(integer)
SWOOLE_SOCK_UNIX_STREAM
(integer)
SWOOLE_TCP
(integer)
SWOOLE_TCP6
(integer)
SWOOLE_UDP
(integer)
SWOOLE_UDP6
(integer)
SWOOLE_UNIX_DGRAM
(integer)
SWOOLE_UNIX_STREAM
(integer)
SWOOLE_SOCK_SYNC
(integer)
SWOOLE_SOCK_ASYNC
(integer)
SWOOLE_SYNC
(integer)
SWOOLE_ASYNC
(integer)
SWOOLE_KEEP
(integer)
SWOOLE_EVENT_READ
(integer)
SWOOLE_EVENT_WRITE
(integer)
SWOOLE_VERSION
(string)
SWOOLE_AIO_BASE
(integer)
SWOOLE_AIO_LINUX
(integer)
SWOOLE_FILELOCK
(integer)
SWOOLE_MUTEX
(integer)
SWOOLE_SEM
(integer)
SWOOLE_RWLOCK
(integer)
WEBSOCKET_OPCODE_TEXT
(integer)
WEBSOCKET_OPCODE_BINARY
(integer)
WEBSOCKET_OPCODE_PING
(integer)
WEBSOCKET_STATUS_CONNECTION
(integer)
WEBSOCKET_STATUS_HANDSHAKE
(integer)
WEBSOCKET_STATUS_FRAME
(integer)
WEBSOCKET_STATUS_ACTIVE
(integer)
SWOOLE_FAST_PACK
(integer)