Merge PDF documents with Zend_Pdf

Merging two or more PDF files with Zend_Pdf component of the Zend Framework is really simple. You just need to load the documents into Zend_Pdf instances and then iterate over their pages:

// load PDF documents

$pdf1 = Zend_Pdf::load('first.pdf');

$pdf2 = Zend_Pdf::load('second.pdf');

// we will merge our two PDF files into a new Zend_Pdf object

$pdfMerged = new Zend_Pdf();

// add all pages from the first PDF to our new document

foreach($pdf1->pages as $page){

    $clonedPage = clone $page;

    $pdfMerged->pages[] = $clonedPage;

}

// add all pages from the second PDF to our new document

foreach($pdf2->pages as $page){

    $clonedPage = clone $page;

    $pdfMerged->pages[] = $clonedPage;

}

unset($clonedPage);

// send the merged PDF document to browser

header('Content-type: application/pdf');

echo $pdfMerged->render();