(PECL ev >= 0.2.0)
EvLoop::child — Creates EvChild object associated with the current event loop
$pid
   
   , 
    string
     $trace
   
   , 
    string
     $callback
   
   [, 
    string
     $data
   
   [, 
    string
     $priority
   
  ]] )Creates EvChild object associated with the current event loop.
All parameters have the same meaning as for EvChild::__construct()
Returns EvChild object on success.