Stamp a PDF file in PHP

<?php
//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2022 by PDFTron Systems Inc. All Rights Reserved.
// Consult LICENSE.txt regarding license information.
//---------------------------------------------------------------------------------------
if(file_exists("../../../PDFNetC/Lib/PDFNetPHP.php"))
include("../../../PDFNetC/Lib/PDFNetPHP.php");
include("../../LicenseKey/PHP/LicenseKey.php");

// Relative path to the folder containing the test files.
$input_path = getcwd()."/../../TestFiles/";
$output_path = $input_path."Output/";
$input_filename = "newsletter";

//---------------------------------------------------------------------------------------
// The following sample shows how to add new content (or watermark) PDF pages
// using 'pdftron.PDF.Stamper' utility class. 
//
// Stamper can be used to PDF pages with text, images, or with other PDF content 
// in only a few lines of code. Although Stamper is very simple to use compared 
// to ElementBuilder/ElementWriter it is not as powerful or flexible. In case you 
// need full control over PDF creation use ElementBuilder/ElementWriter to add 
// new content to existing PDF pages as shown in the ElementBuilder sample project.
//---------------------------------------------------------------------------------------

	PDFNet::Initialize($LicenseKey);
	PDFNet::GetSystemFontList();    // Wait for fonts to be loaded if they haven't already. This is done because PHP can run into errors when shutting down if font loading is still in progress.

	//--------------------------------------------------------------------------------
	// Example 1) Add text stamp to all pages, then remove text stamp from odd pages. 
	
	$doc = new PDFDoc($input_path.$input_filename.".pdf");
	$doc->InitSecurityHandler();
	$s = new Stamper(Stamper::e_relative_scale, 0.5, 0.5);		

	$s->SetAlignment(Stamper::e_horizontal_center, Stamper::e_vertical_center);
	$red = new ColorPt(1.0, 0.0, 0.0); // set text color to red
	$s->SetFontColor($red);
	$s->StampText($doc, "If you are reading this\nthis is an even page", new PageSet(1, $doc->GetPageCount()));
	//delete all text stamps in even pages
	Stamper::DeleteStamps($doc, new PageSet(1, $doc->GetPageCount(), PageSet::e_odd));

	$doc->Save($output_path.$input_filename.".ex1.pdf", SDFDoc::e_linearized);
	$doc->Close();

	//--------------------------------------------------------------------------------
	// Example 2) Add Image stamp to first 2 pages. 
	
	$doc = new PDFDoc($input_path.$input_filename.".pdf");
	$doc->InitSecurityHandler();

	$s = new Stamper(Stamper::e_relative_scale, 0.05, 0.05);
	$img = Image::Create($doc->GetSDFDoc(), $input_path."peppers.jpg");
	$s->SetSize(Stamper::e_relative_scale, 0.5, 0.5);
	//set position of the image to the center, left of PDF pages
	$s->SetAlignment(Stamper::e_horizontal_left, Stamper::e_vertical_center);
	$pt = new ColorPt(0.0, 0.0, 0.0, 0.0);
	$s->SetFontColor($pt);
	$s->SetRotation(180);
	$s->SetAsBackground(false);
	//only stamp first 2 pages
	$ps = new PageSet(1, 2);
	$s->StampImage($doc, $img, $ps);

	$doc->Save($output_path.$input_filename.".ex2.pdf", SDFDoc::e_linearized);
	$doc->Close();

	//--------------------------------------------------------------------------------
	// Example 3) Add Page stamp to all pages. 
	
	$doc = new PDFDoc($input_path.$input_filename.".pdf");
	$doc->InitSecurityHandler();

	$fish_doc = new PDFDoc($input_path."fish.pdf");
	$fish_doc->InitSecurityHandler();

	$s = new Stamper(Stamper::e_relative_scale, 0.5, 0.5);
	$src_page = $fish_doc->GetPage(1);		 
	$page_one_crop = $src_page->GetCropBox();
	// set size of the image to 10% of the original while keep the old aspect ratio
	$s->SetSize(Stamper::e_absolute_size, $page_one_crop->Width() * 0.1, -1);
	$s->SetOpacity(0.4);
	$s->SetRotation(-67);
	//put the image at the bottom right hand corner
	$s->SetAlignment(Stamper::e_horizontal_right, Stamper::e_vertical_bottom);
	$ps = new PageSet(1, $doc->GetPageCount());
	$s->StampPage($doc, $src_page, $ps);

	$doc->Save($output_path.$input_filename.".ex3.pdf", SDFDoc::e_linearized);
	$doc->Close();

	//--------------------------------------------------------------------------------
	// Example 4) Add Image stamp to first 20 odd pages.
	
	$doc = new PDFDoc($input_path.$input_filename.".pdf");
	$doc->InitSecurityHandler();

	$s = new Stamper(Stamper::e_absolute_size, 20.0, 20.0);
	$s->SetOpacity(1);
	$s->SetRotation(45);                
	$s->SetAsBackground(true);
	$s->SetPosition(30.0, 40.0);
	$img = Image::Create($doc->GetSDFDoc(), $input_path."peppers.jpg");
	$ps = new PageSet(1, 20, PageSet::e_odd);
	$s->StampImage($doc, $img, $ps);

	$doc->Save($output_path.$input_filename.".ex4.pdf", SDFDoc::e_linearized);
	$doc->Close();

	//--------------------------------------------------------------------------------
	// Example 5) Add text stamp to first 20 even pages
	
	$doc = new PDFDoc($input_path.$input_filename.".pdf");
	$doc->InitSecurityHandler();

	$s = new Stamper(Stamper::e_relative_scale, 0.05, 0.05);
	$s->SetPosition(0.0, 0.0);
	$s->SetOpacity(0.7);
	$s->SetRotation(90);
	$s->SetSize(Stamper::e_font_size, 80, -1);
	$s->SetTextAlignment(Stamper::e_align_center);
	$ps = new PageSet(1, 20, PageSet::e_even);
	$s->StampText($doc, "Goodbye\nMoon", $ps);

	$doc->Save($output_path.$input_filename.".ex5.pdf", SDFDoc::e_linearized);
	$doc->Close();

	//--------------------------------------------------------------------------------
	// Example 6) Add first page as stamp to all even pages
	
	$doc = new PDFDoc($input_path.$input_filename.".pdf");
	$doc->InitSecurityHandler();

	$fish_doc = new PDFDoc($input_path."fish.pdf");
	$fish_doc->InitSecurityHandler();

	$s = new Stamper(Stamper::e_relative_scale, 0.3, 0.3);
	$s->SetOpacity(1);                
	$s->SetRotation(270);
	$s->SetAsBackground(true);
	$s->SetPosition(0.5, 0.5, true);
	$s->SetAlignment(Stamper::e_horizontal_left, Stamper::e_vertical_bottom);
	$page_one = $fish_doc->GetPage(1);
	$ps = new PageSet(1, $doc->GetPageCount(), PageSet::e_even);
	$s->StampPage($doc, $page_one, $ps);

	$doc->Save($output_path.$input_filename.".ex6.pdf", SDFDoc::e_linearized);
	$doc->Close();

	//--------------------------------------------------------------------------------
	// Example 7) Add image stamp at top right corner in every pages
	
	$doc = new PDFDoc($input_path.$input_filename.".pdf");
	$doc->InitSecurityHandler();

	$s = new Stamper(Stamper::e_relative_scale, 0.1, 0.1);
	$s->SetOpacity(0.8);
	$s->SetRotation(135);
	$s->SetAsBackground(false);
	$s->ShowsOnPrint(false);
	$s->SetAlignment(Stamper::e_horizontal_left, Stamper::e_vertical_top);
	$s->SetPosition(10.0, 10.0);

	$img = Image::Create($doc->GetSDFDoc(), $input_path."peppers.jpg");
	$ps = new PageSet(1, $doc->GetPageCount(), PageSet::e_all);
	$s->StampImage($doc, $img, $ps);

	$doc->Save($output_path.$input_filename.".ex7.pdf", SDFDoc::e_linearized);
	$doc->Close();

	//--------------------------------------------------------------------------------
	// Example 8) Add Text stamp to first 2 pages, and image stamp to first page.
	//          Because text stamp is set as background, the image is top of the text
	//          stamp. Text stamp on the first page is not visible.
	
	$doc = new PDFDoc($input_path.$input_filename.".pdf");
	$doc->InitSecurityHandler();

	$s = new Stamper(Stamper::e_relative_scale, 0.07, -0.1);
	$s->SetAlignment(Stamper::e_horizontal_right, Stamper::e_vertical_bottom);
	$s->SetAlignment(Stamper::e_horizontal_center, Stamper::e_vertical_top);
	$s->SetFont(Font::Create($doc->GetSDFDoc(), Font::e_courier, true));
	$red = new ColorPt(1.0, 0.0, 0.0, 0.0);
	$s->SetFontColor($red); //set color to red
	$s->SetTextAlignment(Stamper::e_align_right);
	$s->SetAsBackground(true); //set text stamp as background
	$ps = new PageSet(1, 2);
	$s->StampText($doc, "This is a title!", $ps);

	$img = Image::Create($doc->GetSDFDoc(), $input_path."peppers.jpg");
	$s->SetAsBackground(false); // set image stamp as foreground
	$first_page_ps = new PageSet(1);
	$s->StampImage($doc, $img, $first_page_ps);

	$doc->Save($output_path.$input_filename.".ex8.pdf", SDFDoc::e_linearized);
	$doc->Close();
	PDFNet::Terminate();

?>