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php implements printing document function

王林

May 28, 2023 pm 04:24 PM

In many websites, we often see the function of printing documents. Users can print out the page content by clicking the print button. The traditional implementation method is to operate through the browser's own printing function, but this method has many disadvantages, such as inconsistent styles, abnormal image display, etc. In order to solve these problems, PHP can be used to implement the printing document function.

Implementation Idea

The basic idea of using PHP to realize the printing document function is to convert the content that needs to be printed into a PDF document through a server-side script, and then download or directly print the PDF file through the browser . The specific implementation steps are as follows:

1. Get the content that needs to be printed

In PHP, we can use $_POST or $_GET to get the content that needs to be printed, such as tables, pictures, Text etc. After getting the content, we need to combine it into an HTML file.

2. Convert HTML files to PDF documents

There are many ways to convert HTML to PDF files, such as using third-party libraries TCPDF, wkhtmltopdf, dompdf, etc. Here we take using dompdf as an example.

First, you need to use composer to install the dompdf library:

composer require dompdf/dompdf

Then, use the following code to convert the HTML content into a PDF file ：

use DompdfDompdf;
$dompdf = new Dompdf();
$dompdf->loadHtml($html);
$dompdf->render();
$dompdf->stream("document.pdf");

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Among them, $html is the HTML content that needs to be converted. The render() method will convert the HTML into a PDF file. The stream("document.pdf") method will output the PDF file to the browser for downloading or Print.

3. Provide a print button

Provide a print button in the web page. When the user clicks the button, the PDF file will be downloaded to the local through JavaScript or the tag of HTML5, or directly Call the browser's print function to print.

JavaScript way:

function print() {
    var pdfUrl = 'http://example.com/document.pdf'; // PDF文件的URL
    var pdfWin = window.open(pdfUrl);
    pdfWin.print();
}

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HTML5 way:

<a href="http://example.com/document.pdf" target="_blank" rel="noopener noreferrer" onclick="window.print(); return false;">打印</a>

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Implementation example

The following is a simple example that demonstrates how to implement using PHP and dompdf library Print document function.

1. Create a new HTML page, containing the content to be printed:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Print Document</title>
</head>
<body>
    <h1>打印测试</h1>
    <table>
        <tr>
            <th>姓名</th>
            <th>性别</th>
            <th>年龄</th>
        </tr>
        <tr>
            <td>张三</td>
            <td>男</td>
            <td>25</td>
        </tr>
        <tr>
            <td>李四</td>
            <td>女</td>
            <td>28</td>
        </tr>
    </table>
    <script>
        function print() {
            var xhr = new XMLHttpRequest();
            xhr.open('POST', 'print.php', true);
            xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
            xhr.onreadystatechange = function() {
                if (xhr.readyState === 4 && xhr.status === 200) {
                    var pdfUrl = xhr.responseText;
                    var pdfWin = window.open(pdfUrl);
                    pdfWin.print();
                }
            };
            xhr.send('content=' + encodeURIComponent(document.body.innerHTML));
        }
    </script>
    <button onclick="print()">打印</button>
</body>
</html>

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2. Create a new PHP page, used to receive HTML content and convert it into a PDF file:

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

use DompdfDompdf;

if (isset($_POST['content'])) {
    $html = $_POST['content'];

    $dompdf = new Dompdf();
    $dompdf->loadHtml($html);
    $dompdf->render();
    $dompdf->stream();
}

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3. Use composer to install the dompdf library on the command line:

composer require dompdf/dompdf

4. Execute the following command to start PHP’s built-in web server:

php -S localhost:8000

Open http://localhost:8000 in the browser to access the sample page, click the "Print" button to Convert the current page to a PDF file and download or print the file.

Summary

Using PHP to implement the document printing function can solve the shortcomings of the traditional browser printing function and improve the experience and effect of printing documents. Although using a third-party library to implement the PDF conversion function can save a lot of time and effort, you also need to pay attention to its performance and security issues.

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