Stringable Markdown with Iframe Support

markdown-with-iframes.php

<?php

// within AppServiceProvider::boot() or a similar entry point

Stringable::macro('markdownWithIframes', function ($config = []) {
    $config['disallowed_raw_html'] = [
        'disallowed_tags' => ['title', 'textarea', 'style', 'xmp', 'noembed', 'noframes', 'script', 'plaintext'],
    ];

    $environment = new Environment($config);
    $environment->addExtension(new CommonMarkCoreExtension());
    $environment->addExtension(new AutolinkExtension());
    $environment->addExtension(new DisallowedRawHtmlExtension());
    $environment->addExtension(new StrikethroughExtension());
    $environment->addExtension(new TableExtension());
    $environment->addExtension(new TaskListExtension());

    $converter = new MarkdownConverter($environment);

    return new static($converter->convert($this->value));
});