How to use ThinkPHP6 to generate PDF files?

With the development of the information age, PDF documents have become an indispensable part of daily work and study. With the popularization of the Internet and mobile Internet, and the advancement of electronic processes, the application scenarios of PDF documents are also expanding, such as reports, certificates, contracts, etc. Therefore, the implementation of generating PDF documents through code has also become a need for many enterprises and individual developers. This article will introduce how to use ThinkPHP6 to generate PDF files. I hope it will be helpful to you.

1. Background knowledge

Before we start to introduce how to use ThinkPHP6 to generate PDF files, we need to understand some basic background knowledge:

1. What is PDF?

PDF (Portable Document Format) is an electronic file format developed by Adobe for network transmission and printing. It can be used on various operating systems. . It can integrate documents, graphics, pictures, fonts and other elements into one file.

2. What is ThinkPHP?

ThinkPHP is an open source PHP framework based on the PHP language and is one of the most popular PHP frameworks in China. ThinkPHP follows the MVC architecture and supports numerous database operations, template engines, permission authentication, caching and other functions, which can provide developers with a simple, efficient and safe development experience.

3. What are the ways to generate PDF files?

Generally speaking, there are several ways to generate PDF files:

(1) Manually write PDF files

(2) Use third-party libraries to generate PDF file

(3) Use cloud service to generate PDF file

Among these three methods, using a third-party library is the most commonly used one because it is easy to use and functional. It has the advantages of being complete and supporting a wide range of languages.

2. Use ThinkPHP6 to create the code to generate PDF files

1. Install the TCPDF component

Before using ThinkPHP6 to generate PDF files, we need to install it first TCPDF component. TCPDF is an open source PHP class library used to generate PDF documents. You can download the TCPDF component from the TCPDF official website or Github, and install it according to the guidelines of the official documentation. Here we can install it via Composer.

Enter the following command line in the terminal window:

composer require tecnickcom/tcpdf

Wait for the installation to complete, and the TCPDF component will be automatically added to the vendor directory.

2. Create a PDF file generation controller

Before using the ThinkPHP6 framework to generate PDF files, you need to create a PDF file generation controller. In the project file directory, create a Generatepdf.php file as a controller in the app/controller directory through the following command:

php think make:controller Generatepdf

3. Write PDF file generation code

In In the controller that generates PDF files, you need to implement the method of generating PDF files. Here, we take generating a simple PDF file as an example.

In the method of generating PDF files, we need to call the TCPDF library and generate PDF files. We need to do the following steps:

(1) Introduce the TCPDF library

Introduce the TCPDF library into the controller and initialize it. You can see the following code for implementation:

use TCPDF;

class Generatepdf extends BaseController
{
    public function index()
    {
        // 引入TCPDF库
        require_once('../vendor/tecnickcom/tcpdf/tcpdf.php');

        // 初始化对象
        $pdf = new TCPDF();
    }
}

(2) Set PDF file parameters

You can set the properties, page size, page orientation and other properties of the PDF file in the method of generating PDF files. You can see the following code for implementation:

$pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);

$pdf->SetCreator('ThinkPHP6');
$pdf->SetAuthor('作者');
$pdf->SetTitle('PDF文档');
$pdf->SetSubject('PDF文档 Demo');
$pdf->SetKeywords('PDF, Demo, TCPDF, PHP');

$pdf->SetMargins(PDF_MARGIN_LEFT, PDF_MARGIN_RIGHT, PDF_MARGIN_TOP);
$pdf->SetHeaderMargin(0);
$pdf->SetFooterMargin(PDF_MARGIN_BOTTOM);

$pdf->setPrintHeader(false);
$pdf->setPrintFooter(false);

$pdf->SetAutoPageBreak(TRUE, PDF_MARGIN_BOTTOM);
$pdf->SetFont('cid0jp', '', 14);
$pdf->AddPage();

(3) Add content to the PDF file

You can use the methods provided by the TCPDF library to add elements such as images, text, tables, etc. to the PDF file. You can see the following code for implementation:

$pdf->Image('test.png', 10, 10, 150, 100, '', '', '', false, 300, '', false, false, 0, false, false, false);
$pdf->SetFont('cid0jp', '', 20);
$pdf->Cell(0,20,'Hello,World',0,1,'C');

$pdf->Ln();
$pdf->Ln();
$style = array('border' => 1, 'padding' => '2', 'header_line' => true, 'color' => array(255, 255, 255), 'font' => 'cid0jp', 'font_size' => 10);
$pdf->writeHTMlTable($data, $style);

(4) Generate PDF file

After completing the operation of adding elements to the PDF file, you also need to call the Output() method to output the PDF file. Display or download the file on the browser.

$pdf->Output('test.pdf', 'D');

3. Summary

Through the above steps, we can use the ThinkPHP6 framework to generate PDF documents. During the development process, you also need to pay attention to the problem of PDF file paths, which can be solved by using relative paths or absolute paths. In addition, the TCPDF library also provides many other functions that can be called and expanded according to actual needs. I hope the content of this article will be helpful to developers who use ThinkPHP6 to generate PDF files.

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