Sokil\Mongo\Expression::whereIn PHP Method

    public function whereIn($field, array $values)
    {
        return $this->where($field, array('$in' => $values));
    }

 /**
  * Filter by list of \MongoId
  *
  * @param array $idList list of ids
  * @return \Sokil\Mongo\Cursor
  */
 public function byIdList(array $idList)
 {
     $this->expression->whereIn('_id', self::mixedToMongoIdList($idList));
     return $this;
 }