Programmer's Reference Guide
Zend_Pdf class represents PDF document itself and provides document level
functionality.
To create new document new Zend_Pdf object should be created.
Zend_Pdf class also provides two static methods to load existing PDF.
These are Zend_Pdf::load() and Zend_Pdf::parse() methods.
Both of them return Zend_Pdf object as a result or throw an exception if error occurs.
Example 37.1. Create new or load existing PDF document.
...
// Create new PDF document.
$pdf1 = new Zend_Pdf();
// Load PDF document from a file.
$pdf2 = Zend_Pdf::load($fileName);
// Load PDF document from a string.
$pdf3 = Zend_Pdf::parse($pdfString);
...
PDF file format supports incremental document update. Thus each time when document is updated, then new revision of the document is created. Zend_Pdf module supports retrieving of specified revision.
Revision can be specified as a second parameter for Zend_Pdf::load() and
Zend_Pdf::parse() methods or requested by Zend_Pdf::rollback()
[4]
call.
Example 37.2. Requesting specified revision of the PDF document.
...
// Load PDF previouse revision of the document.
$pdf1 = Zend_Pdf::load($fileName, 1);
// Load PDF previouse revision of the document.
$pdf2 = Zend_Pdf::parse($pdfString, 1);
// Load first revision of the document.
$pdf3 = Zend_Pdf::load($fileName);
$revisions = $pdf3->revisions();
$pdf3->rollback($revisions - 1);
...
[4]
Zend_Pdf::rollback() method must be invoked before any changes, applied to the document.
Otherwise behavior is undefined.
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