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Replace FPDF/FPDI by TCPDF
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Benjamin committed Nov 23, 2018
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369 changes: 202 additions & 167 deletions Classes/PDFMerger.php
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<?php

/**
* PDFMerger created by Jarrod Nettles December 2009
* [email protected]
*
* v1.0.2
* @file
* PDFMerger created in December 2009
* @author Jarrod Nettles <[email protected]>
*
* 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.
* Updated by Vasiliy Zaytsev February 2016
* [email protected]
*
* 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.
* @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.
*
* Uses FPDI 1.3.1 from Setasign
* Uses FPDF 1.6 by Olivier Plathey with FPDF_TPL extension 1.1.3 by Setasign
* 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.
*
* Both of these packages are free and open source software, bundled with this class for ease of use.
* They are not modified in any way. 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).
* @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.
*/
public function __construct()
{
if(!class_exists("FPDF")) {
require_once('fpdf/fpdf.php');
}
if(!class_exists("FPDI")) {
require_once('fpdi/fpdi.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 $pages
* @return void
* @throws exception
*/
public function addPDF($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 $outputpath
* @return PDF
* @throws exception
*/
public function merge($outputmode = 'browser', $outputpath = 'newfile.pdf')
private $_files; //['form.pdf'] ["1,2,4, 5-19"]
private $_fpdi;

/**
* Merge PDFs.
* @return void
*/
public function __construct()
{
if (!isset($this->_files) || !is_array($this->_files)): throw new exception("No PDFs to merge."); endif;

$fpdi = new FPDI;

//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);
}
}
if(!class_exists("TCPDF")) {
require_once('tcpdf/tcpdf.php');
}

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

if ($mode == 'S') {
return $fpdi->Output($outputpath, 'S');
} else {
if ($fpdi->Output($outputpath, $mode) == '') {
return true;
} else {
throw new exception("Error outputting PDF to '$outputmode'.");
return false;
}
if(!class_exists("TCPDI")) {
require_once('tcpdf/tcpdi.php');
}


}

/**
* 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 $pages
* @return array
* @throws exception
*/
private function _rewritepages($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;
}

}
/**
* 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');
}
else if($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;
}

}
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