code: public function where($conditions, $value = false, $comparison = '=')
      {
          $this->store('condition', 'wheres', $conditions, $value, $comparison);
          return $this;
      }
docs: WHERE array format:
  [
  [
  [
  ['amount', '>', '1000'],
  ['savings', '>', '100']
  ],
  'AND'
  ]
  ]