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(PECL ev >= 0.2.0)
EvLoop::fork — Creates EvFork watcher object associated with the current event loop instance
$callback 
   [,   mixed  $data  =  NULL   
   [,  int $priority  = 0 
  ]] )Creates EvFork watcher object associated with the current event loop instance
All parameters have the same meaning as for EvFork::__construct()
Returns EvFork object on success.