SetaPDF_Core_Type_Null Class representing a null object
File: /SetaPDF v2/Core/Type/Null.php
Defines if this object is under observation
The Objects to notify on any change
This will be the PDF document or another value holding this one. Initially this will be an array.
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