The pages in a PDF document are represented as
Zend_Pdf_Page instances in Zend_Pdf.
PDF pages either are loaded from an existing PDF
or created using the Zend_Pdf API.
New pages can be created by instantiating new Zend_Pdf_Page
objects directly or by calling the Zend_Pdf::newPage() method,
which returns a Zend_Pdf_Page object.
Zend_Pdf::newPage() creates a page that is already attached to
a document. Attached pages can't be used with another PDF
documents until it's not cloned. See Page
cloning section for the details.
The Zend_Pdf::newPage() method and the
Zend_Pdf_Page constructor take the same parameters specifying
page size. They can take either the size of page ($x, $y) in points (1/72 inch) or a
predefined constant representing a page type:
Zend_Pdf_Page::SIZE_A4
Zend_Pdf_Page::SIZE_A4_LANDSCAPE
Zend_Pdf_Page::SIZE_LETTER
Zend_Pdf_Page::SIZE_LETTER_LANDSCAPE
Document pages are stored in the $pages public attribute of the
Zend_Pdf class. The attribute holds an array of
Zend_Pdf_Page objects and completely defines the instances and
order of pages. This array can be manipulated like any other PHP
array:
Example 641. PDF document pages management
... // Reverse page order $pdf->pages = array_reverse($pdf->pages); ... // Add new page $pdf->pages[] = new Zend_Pdf_Page(Zend_Pdf_Page::SIZE_A4); // Add new page $pdf->pages[] = $pdf->newPage(Zend_Pdf_Page::SIZE_A4); // Remove specified page. unset($pdf->pages[$id]); ...
Existing PDF page can be duplicated by creating new
Zend_Pdf_Page object with existing page as a parameter:
Example 642. Duplicating existing page
...
// Store template page in a separate variable
$template = $pdf->pages[$templatePageIndex];
...
// Add new page
$page1 = new Zend_Pdf_Page($template);
$page1->drawText('Some text...', $x, $y);
$pdf->pages[] = $page1;
...
// Add another page
$page2 = new Zend_Pdf_Page($template);
$page2->drawText('Another text...', $x, $y);
$pdf->pages[] = $page2;
...
// Remove source template page from the documents.
unset($pdf->pages[$templatePageIndex]);
...
It's useful if you need several pages to be created using one template.
Caution
Important! Duplicated page shares some PDF resources with a template page, so it can be used only within the same document as a template page. Modified document can be saved as new one.
clone operator may be used to create page which is not attached to any document.
It takes more time than duplicating page since it needs to copy all dependent objects
(used fonts, images and other resources), but it allows to use pages from different source
documents to create new one:
Example 643. Cloning existing page
$page1 = clone $pdf1->pages[$templatePageIndex1];
$page2 = clone $pdf2->pages[$templatePageIndex2];
$page1->drawText('Some text...', $x, $y);
$page2->drawText('Another text...', $x, $y);
...
$pdf = new Zend_Pdf();
$pdf->pages[] = $page1;
$pdf->pages[] = $page2;
If several template pages are planned to be used as templates then it could be more efficient
to utilize Zend_Pdf_Resource_Extractor class which gives an ability
to share resources between cloned pages - fonts, images, etc. (otherwise new resource copy
will be created for each cloned page):
Example 644. Cloning existing page using Zend_Pdf_Resource_Extractor class
$extractor = new Zend_Pdf_Resource_Extractor();
....
$page1 = $extractor->clonePage($pdf->pages[$templatePageIndex1]);
$page2 = $extractor->clonePage($pdf->pages[$templatePageIndex2]);
$page1->drawText('Some text...', $x, $y);
$page2->drawText('Another text...', $x, $y);
...
$pdf = new Zend_Pdf();
$pdf->pages[] = $page1;
$pdf->pages[] = $page2;