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(PECL ev >= 0.2.0)
EvPrepare::__construct — Constructs EvPrepare watcher object
$callback 
   [,  string $data 
   [,  string $priority 
  ]] )Constructs EvPrepare watcher object. And starts the watcher automatically. If need a stopped watcher consider using EvPrepare::createStopped()
callback See Watcher callbacks .
data Custom data associated with the watcher.
priority Watcher priority
Returns EvPrepare object on success.