Library which converts HTML to Markdown for your sanity and convenience.
Requires: PHP 5.3+ or PHP 7.0+
Lead Developer: @colinodell
Original Author: @nickcernis
"What alchemy is this?" you mutter. "I can see why you'd convert Markdown to HTML," you continue, already labouring the question somewhat, "but why go the other way?"
Typically you would convert HTML to Markdown if:
- You have an existing HTML document that needs to be edited by people with good taste.
- You want to store new content in HTML format but edit it as Markdown.
- You want to convert HTML email to plain text email.
- You know a guy who's been converting HTML to Markdown for years, and now he can speak Elvish. You'd quite like to be able to speak Elvish.
- You just really like Markdown.
Require the library by issuing this command:
composer require league/html-to-markdown
Add require 'vendor/autoload.php';
to the top of your script.
Next, create a new HtmlConverter instance, passing in your valid HTML code to its convert()
function:
use League\HTMLToMarkdown\HtmlConverter;
$converter = new HtmlConverter();
$html = "<h3>Quick, to the Batpoles!</h3>";
$markdown = $converter->convert($html);
The $markdown
variable now contains the Markdown version of your HTML as a string:
echo $markdown; // ==> ### Quick, to the Batpoles!
The included demo
directory contains an HTML->Markdown conversion form to try out.
By default, HTML To Markdown preserves HTML tags without Markdown equivalents, like <span>
and <div>
.
To strip HTML tags that don't have a Markdown equivalent while preserving the content inside them, set strip_tags
to true, like this:
$converter = new HtmlConverter(array('strip_tags' => true));
$html = '<span>Turnips!</span>';
$markdown = $converter->convert($html); // $markdown now contains "Turnips!"
Or more explicitly, like this:
$converter = new HtmlConverter();
$converter->getConfig()->setOption('strip_tags', true);
$html = '<span>Turnips!</span>';
$markdown = $converter->convert($html); // $markdown now contains "Turnips!"
Note that only the tags themselves are stripped, not the content they hold.
To strip tags and their content, pass a space-separated list of tags in remove_nodes
, like this:
$converter = new HtmlConverter(array('remove_nodes' => 'span div'));
$html = '<span>Turnips!</span><div>Monkeys!</div>';
$markdown = $converter->convert($html); // $markdown now contains ""
By default, all comments are stripped from the content. To preserve them, use the preserve_comments
option, like this:
$converter = new HtmlConverter(array('preserve_comments' => true));
$html = '<span>Turnips!</span><!-- Monkeys! -->';
$markdown = $converter->convert($html); // $markdown now contains "Turnips!<!-- Monkeys! -->"
To preserve only specific comments, set preserve_comments
with an array of strings, like this:
$converter = new HtmlConverter(array('preserve_comments' => array('Eggs!')));
$html = '<span>Turnips!</span><!-- Monkeys! --><!-- Eggs! -->';
$markdown = $converter->convert($html); // $markdown now contains "Turnips!<!-- Eggs! -->"
By default bold tags are converted using the asterisk syntax, and italic tags are converted using the underlined syntax. Change these by using the bold_style
and italic_style
options.
$converter = new HtmlConverter();
$converter->getConfig()->setOption('italic_style', '*');
$converter->getConfig()->setOption('bold_style', '__');
$html = '<em>Italic</em> and a <strong>bold</strong>';
$markdown = $converter->convert($html); // $markdown now contains "*Italic* and a __bold__"
By default, br
tags are converted to two spaces followed by a newline character as per traditional Markdown. Set hard_break
to true
to omit the two spaces, as per GitHub Flavored Markdown (GFM).
$converter = new HtmlConverter();
$html = '<p>test<br>line break</p>';
$converter->getConfig()->setOption('hard_break', true);
$markdown = $converter->convert($html); // $markdown now contains "test\nline break"
$converter->getConfig()->setOption('hard_break', false); // default
$markdown = $converter->convert($html); // $markdown now contains "test \nline break"
You can pass current Environment
object to customize i.e. which converters should be used.
$environment = new Environment(array(
// your configuration here
));
$environment->addConverter(new HeaderConverter()); // optionally - add converter manually
$converter = new HtmlConverter($environment);
$html = '<h3>Header</h3>
<img src="" />
';
$markdown = $converter->convert($html); // $markdown now contains "### Header" and "<img src="" />"
- Markdown Extra, MultiMarkdown and other variants aren't supported – just Markdown.
- Nested lists and lists containing multiple paragraphs aren't converted correctly.
- Lists inside blockquotes aren't converted correctly.
- Any reported open issues here.
Report your issue or request a feature here. Issues with patches or failing tests are especially welcome.
-
Setext (underlined) headers are the default for H1 and H2. If you prefer the ATX style for H1 and H2 (# Header 1 and ## Header 2), set
header_style
to 'atx' in the options array when you instantiate the object:$converter = new HtmlConverter(array('header_style'=>'atx'));
Headers of H3 priority and lower always use atx style.
-
Links and images are referenced inline. Footnote references (where image src and anchor href attributes are listed in the footnotes) are not used.
-
Blockquotes aren't line wrapped – it makes the converted Markdown easier to edit.
HTML To Markdown requires PHP's xml, lib-xml, and dom extensions, all of which are enabled by default on most distributions.
Errors such as "Fatal error: Class 'DOMDocument' not found" on distributions such as CentOS that disable PHP's xml extension can be resolved by installing php-xml.
Many thanks to all contributors so far. Further improvements and feature suggestions are very welcome.
HTML To Markdown creates a DOMDocument from the supplied HTML, walks through the tree, and converts each node to a text node containing the equivalent markdown, starting from the most deeply nested node and working inwards towards the root node.
- Support for nested lists and lists inside blockquotes.
- Offer an option to preserve tags as HTML if they contain attributes that can't be represented with Markdown (e.g.
style
).
Use one of these great libraries:
- league/commonmark (recommended)
- cebe/markdown
- PHP Markdown
- Parsedown
No guarantees about the Elvish, though.