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(PECL ev >= 0.2.0)
EvIo::__construct — Constructs EvIo watcher object
$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
Returns EvIo object on success.