MongoCursor::limit PHP Method

    public function limit($num)
    {
        $this->errorIfOpened();
        $this->limit = $num;
        return $this;
    }

 /**
  * The cursor constructor
  * @param string|EMongoDocument $modelClass - The class name for the active record
  * @param array|MongoCursor|EMongoCriteria $criteria -  Either a condition array (without sort,limit and skip) or a MongoCursor Object
  * @param array $fields
  */
 public function __construct($modelClass, $criteria = array(), $fields = array())
 {
     // If $fields has something in it
     if (!empty($fields)) {
         $this->partial = true;
     }
     if (is_string($modelClass)) {
         $this->modelClass = $modelClass;
         $this->model = EMongoDocument::model($this->modelClass);
     } elseif ($modelClass instanceof EMongoDocument) {
         $this->modelClass = get_class($modelClass);
         $this->model = $modelClass;
     }
     if ($criteria instanceof MongoCursor) {
         $this->cursor = $criteria;
         $this->cursor->reset();
     } elseif ($criteria instanceof EMongoCriteria) {
         $this->criteria = $criteria;
         $this->cursor = $this->model->getCollection()->find($criteria->condition, $criteria->project)->sort($criteria->sort);
         if ($criteria->skip > 0) {
             $this->cursor->skip($criteria->skip);
         }
         if ($criteria->limit > 0) {
             $this->cursor->limit($criteria->limit);
         }
     } else {
         // Then we are doing an active query
         $this->criteria = $criteria;
         $this->cursor = $this->model->getCollection()->find($criteria, $fields);
     }
 }