MongoCollection::setWriteConcern PHP Method

    public function setWriteConcern($wstring, $wtimeout = 0)
    {
        $result = $this->setWriteConcernFromParameters($wstring, $wtimeout);
        $this->createCollectionObject();
        return $result;
    }

 /**
  * Define write concern for all requests to current collection
  *
  * @param string|integer $w write concern
  * @param int $timeout timeout in milliseconds
  * @throws \Sokil\Mongo\Exception
  * @return \Sokil\Mongo\Collection
  */
 public function setWriteConcern($w, $timeout = 10000)
 {
     if (!$this->_mongoCollection->setWriteConcern($w, (int) $timeout)) {
         throw new Exception('Error setting write concern');
     }
     return $this;
 }