PHP マニュアル: Constructs EvIo watcher object

public EvIo::__construct(
     mixed $fd ,
     int $events ,
     callable $callback ,
     mixed $data = ?,
     int $priority = ?
)

Constructs EvIo watcher object and starts the watcher automatically.

fd: Can be a stream opened with fopen or similar functions, numeric file descriptor, or socket.
events: Ev::READ and/or Ev::WRITE . See the bit masks .
callback: See Watcher callbacks .
data: Custom data associated with the watcher.
priority: Watcher priority