Programmer's Reference Guide
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 40.1. Create new or load existing PDF document
...
// Create a new PDF document
$pdf1 = new Zend_Pdf();
// Load a PDF document from a file
$pdf2 = Zend_Pdf::load($fileName);
// Load a PDF document from a string
$pdf3 = Zend_Pdf::parse($pdfString);
...
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.
[4]
call.
Example 40.2. Requesting Specific Revisions of a PDF Document
...
// Load the previous revision of the PDF document
$pdf1 = Zend_Pdf::load($fileName, 1);
// Load the previous revision of the PDF document
$pdf2 = Zend_Pdf::parse($pdfString, 1);
// Load the first revision of the PDF document
$pdf3 = Zend_Pdf::load($fileName);
$revisions = $pdf3->revisions();
$pdf3->rollback($revisions - 1);
...
[4]
Zend_Pdf::rollback() method must be invoked before any changes are applied to the document,
otherwise the behavior is not defined.
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