Detailed example of converting web content into PDF files in PHP

With the continuous development of the Internet, more and more people are paying attention to how to use PDF files in web pages. Therefore, converting web content into PDF files has become a common need. Among them, PHP's method of converting PDF files is also very popular. Let's explore how to convert web content into PDF files in PHP.

1. How to generate PDF in PHP

There are many ways to generate PDF files in PHP. We can use third-party libraries to achieve this, or we can use PHP built-in functions. Here are two more commonly used methods:

1. Using a third-party library

Currently, the more popular PDF generation libraries on the market include TCPDF and FPDF. They are all open source PHP class libraries that can convert PHP code into PDF files and can generate dynamic PDF files. In addition, there are other extension libraries based on these two libraries.

2. Use PHP built-in functions

The PDFlib library is provided in PHP, which is a library function that allows PHP to generate PDF files. By using the PDFlib library, we can easily generate PDF files, and customize headers, footers, colors, fonts and other attributes when generating PDF files.

2. Use TCPDF to generate PDF files

Below, we take TCPDF as an example to introduce how to use a third-party library to generate PDF files.

1. Install TCPDF

First, we need to install TCPDF in PHP. We can download the latest version of TCPDF file from the TCPDF official website, unzip the file and copy it to the relevant directory (please refer to the installation tutorial given on the official website).

2. Write PHP code

Next, we need to write PHP code and save it as a PHP file. As follows:

<?php require_once(&#39;tcpdf/tcpdf.php&#39;); // 导入TCPDF库，这个路径需要根据你实际的路径而定

$pdf = new TCPDF(); // 创建TCPDF对象

$pdf->AddPage(); // 新增页面

$pdf->SetFont('times', 'BI', 14); // 设置字体

$pdf->Writehtml('<h1 id="这是一份PDF文件">这是一份PDF文件</h1>'); // 写入网页内容

$pdf->Output('example.pdf', 'D'); // 输出PDF文件
?>

Code explanation:

• Line 1 imports the TCPDF library.
• Line 3 is to create a TCPDF object.
• Line 5 is a new page.
• Line 7 is to set the font.
• Line 9 is to write the web page content into the PDF file.
• Line 11 outputs the PDF file to the browser.

3. Run the PHP file

Save the above code as a PHP file, and then run the file. The PDF will be generated and downloaded to the computer, as shown in the figure below:

3. Precautions for generating PDF files with PHP

Use PHP to generate PDF files You need to pay attention to the following matters:

1. The execution time of generating PDF files may be relatively long. Therefore, you need to increase the PHP execution time limit in the PHP configuration file.

2. When using the TCPDF library, you need to pay attention to the PHP version. The current TCPDF library only supports PHP 5.5 and above.

3. The generated PDF file may be relatively large. If you need to generate a smaller PDF file, you can optimize it by writing PHP code, such as using a smaller font size, reducing pictures, etc.

Summary

It is very convenient to use PHP to generate PDF files. Not only can you convert web content into PDF files, you can also customize the style of PDF files. Convert PHP to PDF file is a very useful tool for developers who need to convert web content into PDF files.

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