code: public function setHeaders(array $headers)
      {
          $columnNumber = 0;
          foreach ($headers as $header) {
              $this->updateWidth($columnNumber, $this->length($header));
              if (!in_array($header, $this->headers)) {
                  $this->headers[] = $header;
              }
              $columnNumber++;
          }
      }
docs: Set headers.
  
  @param array $headers