merge pdfs with php

pdf_merge.php

<?php
$path ="lib/";
set_include_path(get_include_path() . PATH_SEPARATOR . $path);
require_once 'lib/Zend/Pdf.php';

// 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();
$pdfMerged->save('out/3.pdf');
/*
/////////


$pdf1 = Zend_Pdf::load("1.pdf");
$pdf2 = Zend_Pdf::load("2.pdf");

foreach ($pdf2->pages as $page){
$pdf1->pages[] = $page;
}

$pdf1->save('3.pdf');
*/