Introduction | Zend_Pdf Programmer's Reference Guide | Save Changes to PDF Documents
# Creating and Loading PDF Documents 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 ... // 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. [1] Zend_Pdf::rollback() call. Example #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); ... [1] method must be invoked before any changes are applied to the document, otherwise the behavior is not defined.
Introduction | Zend_Pdf Programmer's Reference Guide | Save Changes to PDF Documents