SetaPDF_Core_Type_Null Class representing a null object
Parses a php null value to a pdf null string and writes it into a writer.
- $writer : SetaPDF_Core_WriteInterface
- $value : null
This method is used to clean up an object by releasing memory and references.
The observers has to be removed with the detach()-method. Only if there is no observer left this method should really release resources.
The method has to be implemented by each object type