使用ImageMagick将图像合并为PDF页面

Question

I've created a multiple page PDF where I was supposed to add dynamic text to one of the pages (2nd of 3 pages). When I found out my shared host doesn't support PDF manipulation, I had to resort to using ImageMagick, convert each page to its own PNG file.

Adding text using ImageMagick is a dream, but I want to add the front page and back page. I need to combine page1.png , page2.png (with added text) and page3.png to output.pdf but I can't find the right code for doing it with PHP Imagick() class.

I thought I was doing the right when I used the addImage() function, but this wouldn't do it.

What I tried:

<?php

$combined = new Imagick();

$frontpage = new Imagick('png/frontpage.png');
$backpage = new Imagick('png/backpage.png');

$insidepage = new Imagick('png/inside.png');
$draw = new ImagickDraw();

$draw->setFillColor('black');

$draw->setFont('fonts/Georgia-Bold-Italic.ttf');
$draw->setFontSize(44);
$insidepage->annotateImage($draw, 2020, 268, 0, 'Text goes here');

$draw->setFont('fonts/Georgia-Italic.ttf');
$insidepage->annotateImage($draw, 2020, 987, 0, 'Text goes here');

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

$combined->addImage( $frontpage );
$combined->addImage( $insidepage );
$combined->addImage( $backpage );

$combined->setImageFormat('pdf');

echo $combined;

Answer 1

While browsing for another problem I saw this old one which is incompletely answered. For the sake of completeness: The issue is not, that the file has to be written to file storage before displaying on the users browser, rather the usage of echo is causing the empty browser preview.

Use echo $combined->getImageBlob(); instead of echo $combined; .