# phpman > perldoc > PDF::API2::Basic::PDF::Bool

## NAME
    [PDF::API2::Basic::PDF::Bool](https://www.chedong.com/phpMan.php/perldoc/PDF%3A%3AAPI2%3A%3ABasic%3A%3APDF%3A%3ABool/markdown) - Low-level PDF boolean object true or false

## METHODS
  $b->convert($str)
    Converts a string into the string which will be stored.

  as_pdf
    Converts the value to a PDF output form