code: public function join($table, $conditions, $type = 'INNER')
      {
          $dataMember = &$this->joins;
          $item = [$table, $conditions, $type];
          array_push($dataMember, $item);
          return $this;
      }
docs: JOIN array format:
  [
  [
  table,
  [
  conditions
  ],
  type
  ]
  ]