How Can I Edit PDFs Using Open-Source Tools and PHP?

Editing PDFs in PHP with Open Source Tools

This post provides guidance on modifying PDF documents using PHP, specifically focusing on open-source and zero-license solutions.

When working with PDFs, consider opening the file and replacing specific text before saving the modified version. For instance, using the Zend Framework:

<?php
require_once 'Zend/Pdf.php';

$pdf = Zend_Pdf::load('blank.pdf');
$page = $pdf->pages[0];
$font = Zend_Pdf_Font::fontWithName(Zend_Pdf_Font::FONT_HELVETICA);
$page->setFont($font, 12);
$page->drawText('Hello world!', 72, 720);
$pdf->save('zend.pdf');
?>

However, if the goal is to replace inline content within the PDF, such as "[placeholder string]," the process becomes more intricate. While technically feasible, it can disrupt the page layout as PDFs consist of primitive drawing operations instead of layout intent information.

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