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---
layout: default
title: GitHub-Flavored Markdown
description: The GithubFlavoredMarkdownExtension class includes all the GFM addons
---
# GitHub-Flavored Markdown
You can manually add the GFM extension to your environment like this:
```php
use League\CommonMark\CommonMarkConverter;
use League\CommonMark\Environment;
use League\CommonMark\Extension\GithubFlavoredMarkdownExtension;
$environment = Environment::createCommonMarkEnvironment();
$environment->addExtension(new GithubFlavoredMarkdownExtension());
$converter = new CommonMarkConverter([], $environment);
echo $converter->convertToHtml('Hello GFM!');
```
This will automatically include all of these sub-extensions/features for you:
- [Autolinks](/1.3/extensions/autolinks/)
- [Disallowed Raw HTML](/1.3/extensions/disallowed-raw-html/)
- [Strikethrough](/1.3/extensions/strikethrough/)
- [Tables](/1.3/extensions/tables/)
- [Task Lists](/1.3/extensions/task-lists/)
Or, if you only want a subset of GFM extensions, you can add them individually like this instead:
```php
use League\CommonMark\CommonMarkConverter;
use League\CommonMark\Environment;
use League\CommonMark\Extension\Autolink\AutolinkExtension;
use League\CommonMark\Extension\DisallowedRawHtml\DisallowedRawHtmlExtension;
use League\CommonMark\Extension\Strikethrough\StrikethroughExtension;
use League\CommonMark\Extension\Table\TableExtension;
use League\CommonMark\Extension\TaskList\TaskListExtension;
$environment = Environment::createCommonMarkEnvironment();
// Remove any of the lines below if you don't want a particular feature
$environment->addExtension(new AutolinkExtension());
$environment->addExtension(new DisallowedRawHtmlExtension());
$environment->addExtension(new StrikethroughExtension());
$environment->addExtension(new TableExtension());
$environment->addExtension(new TaskListExtension());
$converter = new CommonMarkConverter([], $environment);
echo $converter->convertToHtml('Hello GFM!');
```
This extension relies on the `CommonMarkCoreExtension` being enabled, so [don't forget to include that](/1.3/extensions/commonmark/) too.
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