How to use PHP to extend DOMPDF to generate PDF files

Introduction:
In Web development, exporting PDF files is a common requirement. DOMPDF is a powerful PHP extension that can convert HTML documents to PDF files. This article will introduce how to use the DOMPDF extension to generate PDF files and provide some commonly used code examples.

1. Install the DOMPDF extension

1. First, install the DOMPDF extension through the following command:

composer require dompdf/dompdf

2. After the installation is complete, you can go to the project's vendor/dompdf/ Find the DOMPDF folder in the dompdf directory.

2. Generate a simple PDF file

The following code demonstrates how to use the DOMPDF extension to generate a simple PDF file:

<?php
require_once 'vendor/autoload.php';

use DompdfDompdf;

$dompdf = new Dompdf();
$dompdf->loadHtml('<h1>Hello, DOMPDF!</h1>');

$dompdf->render();
$dompdf->stream('example.pdf', ['Attachment' => false]);
?>

In the above code, we first pass require_once loads the autoload.php file of DOMPDF, and then instantiates a Dompdf object. Next, we use the loadHtml() method to add the content of an

tag to the PDF file. Finally, we use the render() method to convert the HTML to PDF and the stream() method to output the PDF to the browser.

3. Add styles and images

To add styles and images to the generated PDF, you can do it in the following ways:

1. Add CSS styles:

<?php
$dompdf->loadHtml('<h1 style="color: red;">Hello, DOMPDF!</h1>');
?>

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In the above code, we added an inline style on the

tag to set the text color to red.

2. Insert image:

<?php
$dompdf->loadHtml('<img src="image.jpg">');
?>

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In the above code, we have added an image using the tag. Please make sure you place the image file under the correct path so that DOMPDF can load the image correctly.

4. Set page size and orientation

By default, the PDF page size generated by DOMPDF is A4 paper size. You can change the page size and orientation through the following methods:

<?php
$dompdf->setPaper('A4', 'landscape');   //设置页面尺寸为A4，页面方向为横向
?>

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In the above code, we use the setPaper() method to set the page size and orientation. The first parameter is the page size, which can be A4, Letter, etc. The second parameter is the page orientation, which can be portrait (portrait) or landscape (landscape).

5. Process complex HTML documents

DOMPDF extension can process complex HTML documents and generate corresponding PDF files. When processing complex HTML documents, you may need to introduce style sheets, JavaScript, etc. The following is a code example for processing complex HTML documents:

<?php
$dompdf->loadHtmlFile('document.html');   //加载HTML文档
$dompdf->setPaper('A4', 'portrait');      //设置页面尺寸和方向
$dompdf->render();                        //渲染HTML
$dompdf->stream('document.pdf');           //输出PDF
?>

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In the above code, we use the loadHtmlFile() method to load an HTML document, then use the setPaper() method to set the page size and orientation, and use render () method renders HTML into PDF, and finally uses the stream() method to output the PDF to the browser.

6. Summary

This article introduces how to use the DOMPDF extension to generate PDF files, and provides some commonly used code examples. I hope this article will be helpful to developers who use the DOMPDF extension to generate PDF files. The DOMPDF extension has powerful functions and flexibility to meet various needs for exporting PDF files. I wish everyone can successfully generate the required PDF files when using the DOMPDF extension!

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