code: public function getColumnNumber($code)
      {
          if (in_array($code, $this->matching))
          {
              foreach ($this->matching as $number => $codeValue)
              {
                  if ($codeValue == $code)
                  {
                      return (int) $number;
                  }
              }
          }
  
          return null;
      }
docs: @param $code
  
  @return int|null