How to convert PDF files to binary format using PHPPDF library

In web applications, the generation and processing of PDF files are often used, and PHPPDF is a popular PHP library that can be used to generate PDF files. When working with PDF files, the need to convert them to binary format is also common. This article will introduce how to use the PHPPDF library to convert PDF files to binary format.

Introduction to PHPPDF library

PHPPDF is a pure PHP library used to generate, modify and process PDF files. It can generate pages, images, tables, forms and various styles in PHP, and can also embed JavaScript and links and other features. The PHPPDF library is available through Composer.

Use PHPPDF library to generate PDF files

First, we need to use PHPPDF library to generate a PDF file. A sample code is given below:

require_once __DIR__ . '/vendor/autoload.php';

use Spipu\Html2Pdf\Html2Pdf;

$html2pdf = new Html2Pdf();

$content = '<h1>Hello, World!</h1>';

$html2pdf->writeHTML($content);

$html2pdf->output('output.pdf', 'F');

In the above code, we create an HTML2Pdf object and write a title to the PDF file through the writeHTML method. Finally, use the output method to output the PDF file.

Convert PDF file to binary format

Next, we need to convert the generated PDF file to binary format. The PHPPDF library provides an output method that can output PDF files to a specified stream. With this method, we can easily convert PDF files to binary format.

The following is a sample code:

require_once __DIR__ . '/vendor/autoload.php';

use Spipu\Html2Pdf\Html2Pdf;

$html2pdf = new Html2Pdf();

$content = '<h1>Hello, World!</h1>';

$html2pdf->writeHTML($content);

$binaryData = $html2pdf->output('', 'S');

file_put_contents('output.bin', $binaryData);

In the above code, we first create an HTML2Pdf object and write a title to the PDF file. Then, use the output method to output the PDF file to a variable $binaryData. Finally, the binary data is written to the file through the file operation function file_put_contents.

Summary

This article introduces how to use the PHPPDF library to convert PDF files to binary format. First, we create an HTML2Pdf object and write content to the PDF file. Then, the PDF file is output to the binary stream through the output method, and finally the binary data is saved to the file. This technology is very useful in web applications to optimize performance in PDF generation and processing.

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