wyczarujprezent.pl/modules/pminpostpaczkomaty/lib/pdfmerger/PDFMerger.php

<?php
/**
 * @file
 * PDFMerger created in December 2009
 * @author Jarrod Nettles <jarrod@squarecrow.com>
 *
 * Updated by Vasiliy Zaytsev February 2016
 * vasiliy.zaytsev@ffwagency.com
 *
 * @version 2.0
 * This version (comparing to 1.0) supports PDF 1.5 and PDF 1.6.
 *
 * Class for easily merging PDFs (or specific pages of PDFs) together into one.
 * Output to a file, browser, download, or return as a string. Unfortunately,
 * this class does not preserve many of the enhancements your original PDF
 * might contain. It treats your PDF page as an image and then concatenates
 * them all together.
 *
 * Note that your PDFs are merged in the order that you provide them using the
 * addPDF function, same as the pages. If you put pages 12-14 before 1-5 then
 * 12-15 will be placed first in the output.
 *
 * @uses tcpdf 6.2.12 by Nicola Asuni
 * @link https://github.com/tecnickcom/TCPDF/tree/master official clone of lib
 * @uses tcpdi_parser 1.0 by Paul Nicholls, patched by own TCPdiParserException
 * @link https://github.com/pauln/tcpdi_parser source of tcpdi_parser.php
 * @uses TCPDI 1.0 by Paul Nicholls with FPDF_TPL extension 1.2.3 by Setasign
 * @link https://github.com/pauln/tcpdi tcpdi.php
 *
 * All of these packages are free and open source software, bundled with this
 * class for ease of use. PDFMerger has all the limitations of the FPDI package
 *  - essentially, it cannot import dynamic content such as form fields, links
 * or page annotations (anything not a part of the page content stream).
 */

class PDFMerger
{
    private $_files;	//['form.pdf']  ["1,2,4, 5-19"]
    private $_fpdi;

    /**
     * Merge PDFs.
     * @return void
     */
    public function __construct()
    {
        require_once('tcpdf/tcpdf.php');
        require_once('tcpdf/tcpdi.php');
    }

    /**
     * Add a PDF for inclusion in the merge with a valid file path. Pages should be formatted: 1,3,6, 12-16.
     * @param $filepath
     * @param $pages
     * @return void
     */
    public function addPDF($filepath, $pages = 'all')
    {
        if (file_exists($filepath)) {
            if (strtolower($pages) != 'all') {
                $pages = $this->_rewritepages($pages);
            }

            $this->_files[] = array($filepath, $pages);
        } else {
            throw new exception("Could not locate PDF on '$filepath'");
        }

        return $this;
    }

    /**
     * Merges your provided PDFs and outputs to specified location.
     * @param $outputmode
     * @param $outputname
     * @return PDF
     */
    public function merge($outputmode = 'browser', $outputpath = 'newfile.pdf')
    {
        if (!isset($this->_files) || !is_array($this->_files)): throw new exception("No PDFs to merge.");
        endif;

        $fpdi = new TCPDI;
        $fpdi->SetPrintHeader(false);
        $fpdi->SetPrintFooter(false);

        //merger operations
        foreach ($this->_files as $file) {
            $filename  = $file[0];
            $filepages = $file[1];

            $count = $fpdi->setSourceFile($filename);

            //add the pages
            if ($filepages == 'all') {
                for ($i=1; $i<=$count; $i++) {
                    $template = $fpdi->importPage($i);
                    $size = $fpdi->getTemplateSize($template);
                    $orientation = ($size['h'] > $size['w']) ? 'P' : 'L';

                    $fpdi->AddPage($orientation, array($size['w'], $size['h']));
                    $fpdi->useTemplate($template);
                }
            } else {
                foreach ($filepages as $page) {
                    if (!$template = $fpdi->importPage($page)): throw new exception("Could not load page '$page' in PDF '$filename'. Check that the page exists.");
                    endif;
                    $size = $fpdi->getTemplateSize($template);
                    $orientation = ($size['h'] > $size['w']) ? 'P' : 'L';

                    $fpdi->AddPage($orientation, array($size['w'], $size['h']));
                    $fpdi->useTemplate($template);
                }
            }
        }

        //output operations
        $mode = $this->_switchmode($outputmode);

        if ($mode == 'S') {
            return $fpdi->Output($outputpath, 'S');
        } elseif ($mode == 'F') {
            $fpdi->Output($outputpath, $mode);
            return true;
        } else {
            if ($fpdi->Output($outputpath, $mode) == '') {
                return true;
            } else {
                throw new exception("Error outputting PDF to '$outputmode'.");
                return false;
            }
        }
    }

    /**
     * FPDI uses single characters for specifying the output location. Change our more descriptive string into proper format.
     * @param $mode
     * @return Character
     */
    private function _switchmode($mode)
    {
        switch (strtolower($mode)) {
            case 'download':
                return 'D';
                break;
            case 'browser':
                return 'I';
                break;
            case 'file':
                return 'F';
                break;
            case 'string':
                return 'S';
                break;
            default:
                return 'I';
                break;
        }
    }

    /**
     * Takes our provided pages in the form of 1,3,4,16-50 and creates an array of all pages
     * @param $pages
     * @return unknown_type
     */
    private function _rewritepages($pages)
    {
        $pages = str_replace(' ', '', $pages);
        $part = explode(',', $pages);

        //parse hyphens
        foreach ($part as $i) {
            $ind = explode('-', $i);

            if (count($ind) == 2) {
                $x = $ind[0]; //start page
                $y = $ind[1]; //end page

                if ($x > $y): throw new exception("Starting page, '$x' is greater than ending page '$y'.");
                return false;
                endif;

                //add middle pages
                while ($x <= $y): $newpages[] = (int) $x;
                $x++;
                endwhile;
            } else {
                $newpages[] = (int) $ind[0];
            }
        }

        return $newpages;
    }
}