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Creating and Loading PDF Documents - Zend_Pdf
The Zend_Pdf class represents PDF documents and provides document-level operations.
To create a new document, a new Zend_Pdf object should first be created.
Zend_Pdf class also provides two static methods to load an existing PDF document. These are the Zend_Pdf::load() and Zend_Pdf::parse() methods. Both of them return Zend_Pdf objects as a result or throw an exception if an error occurs.
Example #1 Create new or load existing PDF document
The PDF file format supports incremental document update. Thus each time a document is updated, then a new revision of the document is created. Zend_Pdf component supports the retrieval of a specified revision.
A revision can be specified as a second parameter to the Zend_Pdf::load() and Zend_Pdf::parse() methods or requested by calling the Zend_Pdf::rollback() method.  Zend_Pdf::rollback() call.
Example #2 Requesting Specific Revisions of a PDF Document