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# league/commonmark
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**league/commonmark** is a highly-extensible PHP Markdown parser created by [Colin O'Dell][@colinodell] which supports the full [CommonMark] spec and [GitHub-Flavored Markdown]. It is based on the [CommonMark JS reference implementation][commonmark.js] by [John MacFarlane] \([@jgm]\).
## π¦ Installation & Basic Usage
This project requires PHP 7.4 or higher with the `mbstring` extension. To install it via [Composer] simply run:
``` bash
$ composer require league/commonmark
```
The `CommonMarkConverter` class provides a simple wrapper for converting CommonMark to HTML:
```php
use League\CommonMark\CommonMarkConverter;
$converter = new CommonMarkConverter([
'html_input' => 'strip',
'allow_unsafe_links' => false,
]);
echo $converter->convert('# Hello World!');
// <h1>Hello World!</h1>
```
Or if you want GitHub-Flavored Markdown, use the `GithubFlavoredMarkdownConverter` class instead:
```php
use League\CommonMark\GithubFlavoredMarkdownConverter;
$converter = new GithubFlavoredMarkdownConverter([
'html_input' => 'strip',
'allow_unsafe_links' => false,
]);
echo $converter->convert('# Hello World!');
// <h1>Hello World!</h1>
```
Please note that only UTF-8 and ASCII encodings are supported. If your Markdown uses a different encoding please convert it to UTF-8 before running it through this library.
π If you will be parsing untrusted input from users, please consider setting the `html_input` and `allow_unsafe_links` options per the example above. See <https://commonmark.thephpleague.com/security/> for more details. If you also do choose to allow raw HTML input from untrusted users, considering using a library (like [HTML Purifier](https://github.com/ezyang/htmlpurifier)) to provide additional HTML filtering.
## π Documentation
Full documentation on advanced usage, configuration, and customization can be found at [commonmark.thephpleague.com][docs].
## β« Upgrading
Information on how to upgrade to newer versions of this library can be found at <https://commonmark.thephpleague.com/releases>.
## π» GitHub-Flavored Markdown
The `GithubFlavoredMarkdownConverter` shown earlier is a drop-in replacement for the `CommonMarkConverter` which adds additional features found in the GFM spec:
- Autolinks
- Disallowed raw HTML
- Strikethrough
- Tables
- Task Lists
See the [Extensions documentation](https://commonmark.thephpleague.com/customization/extensions/) for more details on how to include only certain GFM features if you don't want them all.
## ποΈ Related Packages
### Integrations
- [CakePHP 3](https://github.com/gourmet/common-mark)
- [Drupal](https://www.drupal.org/project/markdown)
- [Laravel 4+](https://github.com/GrahamCampbell/Laravel-Markdown)
- [Sculpin](https://github.com/bcremer/sculpin-commonmark-bundle)
- [Symfony 2 & 3](https://github.com/webuni/commonmark-bundle)
- [Symfony 4](https://github.com/avensome/commonmark-bundle)
- [Twig Markdown extension](https://github.com/twigphp/markdown-extension)
- [Twig filter and tag](https://github.com/aptoma/twig-markdown)
- [Laravel CommonMark Blog](https://github.com/spekulatius/laravel-commonmark-blog)
### Included Extensions
See [our extension documentation](https://commonmark.thephpleague.com/extensions/overview) for a full list of extensions bundled with this library.
### Community Extensions
Custom parsers/renderers can be bundled into extensions which extend CommonMark. Here are some that you may find interesting:
- [Alt Three Emoji](https://github.com/AltThree/Emoji) An emoji parser for CommonMark.
- [Sup Sub extensions](https://github.com/OWS/commonmark-sup-sub-extensions) - Adds support of superscript and subscript (`<sup>` and `<sub>` HTML tags)
- [YouTube iframe extension](https://github.com/zoonru/commonmark-ext-youtube-iframe) - Replaces youtube link with iframe.
- [Lazy Image extension](https://github.com/simonvomeyser/commonmark-ext-lazy-image) - Adds various options for lazy loading of images.
Others can be found on [Packagist under the `commonmark-extension` package type](https://packagist.org/packages/league/commonmark?type=commonmark-extension).
If you build your own, feel free to submit a PR to add it to this list!
### Others
Check out the other cool things people are doing with `league/commonmark`: <https://packagist.org/packages/league/commonmark/dependents>
## π·οΈ Versioning
[SemVer](http://semver.org/) is followed closely. Minor and patch releases should not introduce breaking changes to the codebase; however, they might change the resulting AST or HTML output of parsed Markdown (due to bug fixes, spec changes, etc.) As a result, you might get slightly different HTML, but any custom code built onto this library should still function correctly.
Any classes or methods marked `@internal` are not intended for use outside of this library and are subject to breaking changes at any time, so please avoid using them.
## π οΈ Maintenance & Support
When a new **minor** version (e.g. `2.0` -> `2.1`) is released, the previous one (`2.0`) will continue to receive security and critical bug fixes for *at least* 3 months.
When a new **major** version is released (e.g. `1.6` -> `2.0`), the previous one (`1.6`) will receive critical bug fixes for *at least* 3 months and security updates for 6 months after that new release comes out.
(This policy may change in the future and exceptions may be made on a case-by-case basis.)
**Professional support, including notification of new releases and security updates, is available through a [Tidelift Subscription](https://tidelift.com/subscription/pkg/packagist-league-commonmark?utm_source=packagist-league-commonmark&utm_medium=referral&utm_campaign=readme).**
## π·ββοΈ Contributing
To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure with us.
If you encounter a bug in the spec, please report it to the [CommonMark] project. Any resulting fix will eventually be implemented in this project as well.
Contributions to this library are **welcome**, especially ones that:
* Improve usability or flexibility without compromising our ability to adhere to the [CommonMark spec]
* Mirror fixes made to the [reference implementation][commonmark.js]
* Optimize performance
* Fix issues with adhering to the [CommonMark spec]
Major refactoring to core parsing logic should be avoided if possible so that we can easily follow updates made to [the reference implementation][commonmark.js]. That being said, we will absolutely consider changes which don't deviate too far from the reference spec or which are favored by other popular CommonMark implementations.
Please see [CONTRIBUTING](https://github.com/thephpleague/commonmark/blob/main/.github/CONTRIBUTING.md) for additional details.
## π§ͺ Testing
``` bash
$ composer test
```
This will also test league/commonmark against the latest supported spec.
## π Performance Benchmarks
You can compare the performance of **league/commonmark** to other popular parsers by running the included benchmark tool:
``` bash
$ ./tests/benchmark/benchmark.php
```
## π₯ Credits & Acknowledgements
- [Colin O'Dell][@colinodell]
- [John MacFarlane][@jgm]
- [All Contributors]
This code is partially based on the [CommonMark JS reference implementation][commonmark.js] which is written, maintained and copyrighted by [John MacFarlane]. This project simply wouldn't exist without his work.
### Sponsors
We'd also like to extend our sincere thanks the following sponsors who support ongoing development of this project:
- [Tidelift](https://tidelift.com/subscription/pkg/packagist-league-commonmark?utm_source=packagist-league-commonmark&utm_medium=referral&utm_campaign=readme) for offering support to both the maintainers and end-users through their [professional support](https://tidelift.com/subscription/pkg/packagist-league-commonmark?utm_source=packagist-league-commonmark&utm_medium=referral&utm_campaign=readme) program
- [Blackfire](https://www.blackfire.io/) for providing an Open-Source Profiler subscription
- [JetBrains](https://www.jetbrains.com/) for supporting this project with complimentary [PhpStorm](https://www.jetbrains.com/phpstorm/) licenses
- [Taylor Otwell](https://twitter.com/taylorotwell) for sponsoring this project through GitHub sponsors
Are you interested in sponsoring development of this project? See <https://www.colinodell.com/sponsor> for a list of ways to contribute.
## π License
**league/commonmark** is licensed under the BSD-3 license. See the [`LICENSE`](LICENSE) file for more details.
## ποΈ Governance
This project is primarily maintained by [Colin O'Dell][@colinodell]. Members of the [PHP League] Leadership Team may occasionally assist with some of these duties.
## πΊοΈ Who Uses It?
This project is used by [Drupal](https://www.drupal.org/project/markdown), [Laravel Framework](https://laravel.com/), [Cachet](https://cachethq.io/), [Firefly III](https://firefly-iii.org/), [Neos](https://www.neos.io/), [Daux.io](https://daux.io/), and [more](https://packagist.org/packages/league/commonmark/dependents)!
---
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<a href="https://tidelift.com/subscription/pkg/packagist-league-commonmark?utm_source=packagist-league-commonmark&utm_medium=referral&utm_campaign=readme">Get professional support for league/commonmark with a Tidelift subscription</a>
</b>
<br>
<sub>
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</sub>
</div>
[CommonMark]: http://commonmark.org/
[CommonMark spec]: http://spec.commonmark.org/
[commonmark.js]: https://github.com/jgm/commonmark.js
[GitHub-Flavored Markdown]: https://github.github.com/gfm/
[John MacFarlane]: http://johnmacfarlane.net
[docs]: https://commonmark.thephpleague.com/
[docs-examples]: https://commonmark.thephpleague.com/customization/overview/#examples
[docs-example-twitter]: https://commonmark.thephpleague.com/customization/inline-parsing#example-1---twitter-handles
[docs-example-smilies]: https://commonmark.thephpleague.com/customization/inline-parsing#example-2---emoticons
[All Contributors]: https://github.com/thephpleague/commonmark/contributors
[@colinodell]: https://www.twitter.com/colinodell
[@jgm]: https://github.com/jgm
[jgm/stmd]: https://github.com/jgm/stmd
[Composer]: https://getcomposer.org/
[PHP League]: https://thephpleague.com