README.md
1# league/commonmark
2
3[](https://packagist.org/packages/league/commonmark)
4[](https://packagist.org/packages/league/commonmark)
5[](LICENSE)
6[](https://travis-ci.org/thephpleague/commonmark)
7[](https://scrutinizer-ci.com/g/thephpleague/commonmark/code-structure)
8[](https://scrutinizer-ci.com/g/thephpleague/commonmark)
9[](https://bestpractices.coreinfrastructure.org/projects/126)
10
11[](https://www.colinodell.com/sponsor)
12
13
14
15**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] \([@jgm]\).
16
17## �� Installation & Basic Usage
18
19This project requires PHP 7.1 or higher with the `mbstring` extension. To install it via [Composer] simply run:
20
21``` bash
22$ composer require league/commonmark
23```
24
25The `CommonMarkConverter` class provides a simple wrapper for converting CommonMark to HTML:
26
27```php
28use League\CommonMark\CommonMarkConverter;
29
30$converter = new CommonMarkConverter([
31 'html_input' => 'strip',
32 'allow_unsafe_links' => false,
33]);
34
35echo $converter->convertToHtml('# Hello World!');
36
37// <h1>Hello World!</h1>
38```
39
40Or if you want Github-Flavored Markdown, use the `GithubFlavoredMarkdownConverter` class instead:
41
42```php
43use League\CommonMark\GithubFlavoredMarkdownConverter;
44
45$converter = new GithubFlavoredMarkdownConverter([
46 'html_input' => 'strip',
47 'allow_unsafe_links' => false,
48]);
49
50echo $converter->convertToHtml('# Hello World!');
51
52// <h1>Hello World!</h1>
53```
54
55Please 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.
56
57�� 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.
58
59## �� Documentation
60
61Full documentation on advanced usage, configuration, and customization can be found at [commonmark.thephpleague.com][docs].
62
63## ⏫ Upgrading
64
65Information on how to upgrade to newer versions of this library can be found at <https://commonmark.thephpleague.com/releases>.
66
67## �� Github-Flavored Markdown
68
69The `GithubFlavoredMarkdownConverter` shown earlier is a drop-in replacement for the `CommonMarkConverter` which adds additional features found in the GFM spec:
70
71 - Autolinks
72 - Disallowed raw HTML
73 - Strikethrough
74 - Tables
75 - Task Lists
76
77See 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.
78
79## ��️ Related Packages
80
81### Integrations
82
83- [CakePHP 3](https://github.com/gourmet/common-mark)
84- [Drupal](https://www.drupal.org/project/markdown)
85- [Laravel 4 & 5](https://github.com/GrahamCampbell/Laravel-Markdown)
86- [Sculpin](https://github.com/bcremer/sculpin-commonmark-bundle)
87- [Symfony 2 & 3](https://github.com/webuni/commonmark-bundle)
88- [Symfony 4](https://github.com/avensome/commonmark-bundle)
89- [Twig Markdown extension](https://github.com/twigphp/markdown-extension)
90- [Twig filter and tag](https://github.com/aptoma/twig-markdown)
91
92### Included Extensions
93
94See [our extension documentation](https://commonmark.thephpleague.com/extensions/overview) for a full list of extensions bundled with this library.
95
96### Community Extensions
97
98Custom parsers/renderers can be bundled into extensions which extend CommonMark. Here are some that you may find interesting:
99
100 - [Alt Three Emoji](https://github.com/AltThree/Emoji) An emoji parser for CommonMark.
101 - [Sup Sub extensions](https://github.com/OWS/commonmark-sup-sub-extensions) - Adds support of superscript and subscript (`<sup>` and `<sub>` HTML tags)
102 - [YouTube iframe extension](https://github.com/zoonru/commonmark-ext-youtube-iframe) - Replaces youtube link with iframe.
103
104Others can be found on [Packagist under the `commonmark-extension` package type](https://packagist.org/packages/league/commonmark?type=commonmark-extension).
105
106If you build your own, feel free to submit a PR to add it to this list!
107
108### Others
109
110Check out the other cool things people are doing with `league/commonmark`: <https://packagist.org/packages/league/commonmark/dependents>
111
112## ��️ Versioning
113
114[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.
115
116Any 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.
117
118## ��️ Maintenance & Support
119
120When a new **minor** version (e.g. `1.4` -> `1.5`) is released, the previous one (`1.4`) will continue to receive security and critical bug fixes for *at least* 3 months.
121
122When a new **major** version is released (e.g. `1.5` -> `2.0`), the previous one (`1.5`) will receive critical bug fixes for *at least* 3 months and security updates for 6 months after that new release comes out.
123
124(This policy may change in the future and exceptions may be made on a case-by-case basis.)
125
126**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).**
127
128## ��♀️ Contributing
129
130To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure with us.
131
132If 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.
133
134Contributions to this library are **welcome**, especially ones that:
135
136 * Improve usability or flexibility without compromising our ability to adhere to the [CommonMark spec]
137 * Mirror fixes made to the [reference implementation][commonmark.js]
138 * Optimize performance
139 * Fix issues with adhering to the [CommonMark spec]
140
141Major 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.
142
143Please see [CONTRIBUTING](https://github.com/thephpleague/commonmark/blob/latest/.github/CONTRIBUTING.md) for additional details.
144
145## �� Testing
146
147``` bash
148$ composer test
149```
150
151This will also test league/commonmark against the latest supported spec.
152
153## �� Performance Benchmarks
154
155You can compare the performance of **league/commonmark** to other popular parsers by running the included benchmark tool:
156
157``` bash
158$ ./tests/benchmark/benchmark.php
159```
160
161## �� Credits & Acknowledgements
162
163- [Colin O'Dell][@colinodell]
164- [John MacFarlane][@jgm]
165- [All Contributors]
166
167This 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.
168
169### Sponsors
170
171We'd also like to extend our sincere thanks the following sponsors who support ongoing development of this project:
172
173 - [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
174 - [RIPS Technologies](https://www.ripstech.com/) for supporting this project with a complimentary [RIPS SaaS](https://www.ripstech.com/product/) license
175 - [JetBrains](https://www.jetbrains.com/) for supporting this project with complimentary [PhpStorm](https://www.jetbrains.com/phpstorm/) licenses
176
177Are you interested in sponsoring development of this project? See <https://www.colinodell.com/sponsor> for a list of ways to contribute.
178
179## �� License
180
181**league/commonmark** is licensed under the BSD-3 license. See the [`LICENSE`](LICENSE) file for more details.
182
183## ��️ Governance
184
185This project is primarily maintained by [Colin O'Dell][@colinodell]. Members of the [PHP League] Leadership Team may occasionally assist with some of these duties.
186
187## ��️ Who Uses It?
188
189This 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)!
190
191---
192
193<div align="center">
194 <b>
195 <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>
196 </b>
197 <br>
198 <sub>
199 Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
200 </sub>
201</div>
202
203[CommonMark]: http://commonmark.org/
204[CommonMark spec]: http://spec.commonmark.org/
205[commonmark.js]: https://github.com/jgm/commonmark.js
206[Github-Flavored Markdown]: https://github.github.com/gfm/
207[John MacFarlane]: http://johnmacfarlane.net
208[docs]: https://commonmark.thephpleague.com/
209[docs-examples]: https://commonmark.thephpleague.com/customization/overview/#examples
210[docs-example-twitter]: https://commonmark.thephpleague.com/customization/inline-parsing#example-1---twitter-handles
211[docs-example-smilies]: https://commonmark.thephpleague.com/customization/inline-parsing#example-2---emoticons
212[All Contributors]: https://github.com/thephpleague/commonmark/contributors
213[@colinodell]: https://www.twitter.com/colinodell
214[@jgm]: https://github.com/jgm
215[jgm/stmd]: https://github.com/jgm/stmd
216[Composer]: https://getcomposer.org/
217[PHP League]: https://thephpleague.com
218
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