How to use phppdf to convert PDF to html (code example)

With the continuous development of Internet technology, people have higher and higher requirements for file formats. For example, many companies or individuals now prefer to use HTML format when processing documents, because HTML format has the advantages of easy operation, visual presentation, and network interoperability. The PDF format is also a widely used document format. So, how to convert documents in PDF format into HTML format? This article will introduce a method implemented in PHP language: using the phppdf library to convert PDF to HTML code.

1. Introduction to phppdf library

The phppdf library is an open source PHP library used to read and parse PDF files and convert them into HTML code or text files. Because the phppdf library is powerful, you need to install the phppdf library first before you can convert PDF files.

2. Install the phppdf library

The easiest way to install the phppdf library is to install it through composer. You only need to execute the following command in the project root directory:

composer require smalot/pdfparser

After installation, if you need to use the phppdf library to convert PDF to HTML code, you need to reference the following namespace in the PHP code:

use Smalot\PdfParser\Parser;

3. Parse PDF files

After installing the phppdf library , we can use it to parse PDF files. The following is the sample code:

$parser = new Parser();
$pdf = $parser->parseFile('path/to/pdf/file');

$text = $pdf->getText();
// 获取PDF文本内容

$html = $pdf->toHtml();
// 获取HTML代码

In the code, we first create a Parser object to parse PDF files. Then, we call the parseFile method to parse the PDF file. The parameter of this method is the path of the PDF file. After parsing it, we can obtain the text content of the PDF file through the getText method, or obtain the HTML code converted from the PDF file through the toHtml method.

4. Processing HTML code

Since the formatting of PDF files is complex, while the formatting of HTML format is relatively simple, processing the HTML code converted from PDF is also an important task. The following are some methods for processing HTML code:

1. Delete redundant tags

There may be many redundant tags in PDF files, such as useless div tags, empty p tags, etc. These Tags not only take up space on the HTML page, but may also affect the reading experience. Therefore, when using PDF to HTML code, we need to delete these useless tags uniformly.

Sample code:

$html = preg_replace('/]*>/', '', $html);
$html = preg_replace('/(<p>]*>)*\n/', '', $html);</p>

2. Adjust typesetting

The typesetting of PDF documents is often irregular and needs to be adjusted. For example, you need to add some CSS style sheets to control the font size or line spacing of the title.

Sample code:

$html = "nbsp;html>\n\n\n<style>
  h1,h2,h3,h4,h5,h6 {
    margin: 0;
    line-height: 1.6em;
    font-size: 1em;
  }\n
</style>\n\n\n" . $html . "\n";

In the code, we added a style sheet, which adjusted the title, removed the indentation of the title, and adjusted the font size and line spacing.

5. Summary

This article introduces the process of using the phppdf library to convert PDF to HTML code, including the steps of installing the phppdf library, parsing PDF files, and processing HTML codes. Through this article, I believe that readers have mastered the method of using the phppdf library to convert PDF to HTML code. I hope it will be helpful to readers in actual project development.

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