A guide to PDF parsing and generation in PHP

PDF Parsing and Generation Guide in PHP

PDF (Portable Document Format) is a very popular electronic document format because it can maintain the consistency of document format and layout on different platforms and devices . In web application development, it is sometimes necessary to parse and generate PDF documents. This article will introduce how to use PHP to parse and generate PDF documents.

Parsing PDF documents

To parse PDF documents, we can use third-party packages. There are many PHP packages available today that can parse PDF documents, some of the popular options are TCPDF, FPDF and mPDF. In this article, we will use the most popular mPDF package as our example. mPDF is an open source PHP class for generating PDF documents on a web server. It's easy to use and works with existing HTML templates.

1. Installing mPDF

First, we need to download the latest stable version from the official website of mPDF. Once downloaded, we need to extract it to a web server folder of our choice. We can save it under our project folder, for example in the "vendor" folder.

2. Create a PDF document

To create a PDF document, we need to introduce the mPDF class and define a new mPDF object. We can use the following code to create a simple PDF document:

<?php
require_once __DIR__ . '/vendor/autoload.php'; // 引入mPDF类

$mpdf = new MpdfMpdf(); // 定义一个新的mPDF对象

$mpdf->WriteHTML('<h1>Hello World!</h1>'); // 添加内容

$mpdf->Output(); // 输出PDF文档

In the above code, we first introduce the mPDF class and then create a new mPDF object. Next, we added a title to the PDF document. Finally, we output the PDF document.

3. Add style and content

We can use HTML and CSS to define the content and style of the PDF document. Code Example:

<?php
require_once __DIR__ . '/vendor/autoload.php'; // 引入mPDF类

$stylesheet = file_get_contents('./style.css'); // 获取样式表
$html = file_get_contents('./content.html'); // 获取内容

$mpdf = new MpdfMpdf(); // 定义一个新的mPDF对象

$mpdf->WriteHTML($stylesheet, 1); // 添加样式表
$mpdf->WriteHTML($html); // 添加内容

$mpdf->Output(); // 输出PDF文档

In the above code, we get the stylesheet and content from the file. Then we added the stylesheet and content to the mPDF object. Finally, we output the PDF document.

Generate PDF documents

The way to generate PDF documents is slightly different from the way to parse PDF documents. Here we will use another third-party package, it's called Dompdf. Dompdf is a PHP-based HTML to PDF converter.

1. Install Dompdf

We can download the latest stable version from the official website of Dompdf. Once downloaded, we need to extract it to a web server folder of our choice. We can save it in our project folder, for example under the vendor folder.

2. Create a PDF document

To create a PDF document, we need to introduce the Dompdf class and define a new Dompdf object. We can create a simple PDF document using the following code:

<?php
require_once __DIR__ . '/vendor/autoload.php'; // 引入Dompdf类

use DompdfDompdf;

$dompdf = new Dompdf(); // 定义一个新的Dompdf对象

$html = '<h1>Hello World!</h1>'; // 添加内容

$dompdf->loadHtml($html); // 加载HTML内容
$dompdf->setPaper('A4', 'portrait'); // 设置纸张和方向

$dompdf->render(); // 渲染PDF文档

$dompdf->stream(); // 输出PDF文档

In the above code, we first introduce the Dompdf class and create a new Dompdf object. Then we defined an HTML string and added it to the Dompdf object. Next, we set the paper size and orientation of the PDF document. Finally, we render the PDF document and output it.

3. Add style and content

We can use HTML and CSS to define the content and style of the PDF document. Code Example:

<?php
require_once __DIR__ . '/vendor/autoload.php'; // 引入Dompdf类

use DompdfDompdf;

$dompdf = new Dompdf(); // 定义一个新的Dompdf对象

$html = file_get_contents('./content.html'); // 获取内容
$stylesheet = file_get_contents('./style.css'); // 获取样式表

$dompdf->loadHtml($html); // 加载HTML内容
$dompdf->setPaper('A4', 'portrait'); // 设置纸张和方向

$dompdf->getOptions()->setIsFontSubsettingEnabled(true); // 启用字体子集功能
$dompdf->getOptions()->setIsPhpEnabled(true); // 启用PHP
$dompdf->getOptions()->setChroot(__DIR__); // 设置根目录
$dompdf->setBasePath(__DIR__); // 设置基本路径

$dompdf->loadHtml($stylesheet, true); // 加载样式表
$dompdf->render(); // 渲染PDF文档

$dompdf->stream(); // 输出PDF文档

In the above code, we get the stylesheet and content from the file. Then we added the stylesheet and content to the Dompdf object. Finally, we render the PDF document and output it.

Summary

This article introduces how to use PHP to parse and generate PDF documents. For parsing of PDF, we can use the mPDF package, which is easy to use and can be used with existing HTML templates. For generating PDF documents, we can use the Dompdf package, which supports HTML and CSS and can easily convert existing web pages to PDF format.

Whether you want to parse a PDF file or generate a PDF file, using PHP and the above-mentioned third-party packages is very simple and efficient.

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