This is the documentation for the unsupported version 1.4. Please consider upgrading your code to the latest stable version


Extensions provide a way to group related parsers, renderers, etc. together with pre-defined priorities, configuration settings, etc. They are perfect for distributing your customizations as reusable, open-source packages that others can plug into their own projects!

To create an extension, simply create a new class implementing ExtensionInterface. This has a single method where you’re given a ConfigurableEnvironmentInterface to register whatever things you need to. For example:

use League\CommonMark\Extension\ExtensionInterface;
use League\CommonMark\ConfigurableEnvironmentInterface;

final class EmojiExtension implements ExtensionInterface
    public function register(ConfigurableEnvironmentInterface $environment)
            // TODO: Create the EmojiParser, Emoji, and EmojiRenderer classes
            ->addInlineParser(new EmojiParser(), 20)
            ->addInlineRenderer(Emoji::class, new EmojiRenderer(), 0)

To hook up your new extension to the Environment, simply do this:

use League\CommonMark\CommonMarkConverter;
use League\CommonMark\Environment;

$environment = Environment::createCommonMarkEnvironment();
$environment->addExtension(new EmojiExtension());

$converter = new CommonMarkConverter([], $environment);
echo $converter->convertToHtml('Hello! :wave:');

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