A few weeks ago I made a cli tool to check the status code of all links on a site. It made use of a home grown crawler.
Today the Laravel integration gets released. The new package called laravel-link-checker can log all broken links. By default, a link is considered broken if the status code of it's response is not in the 200 or 300 range. Once installed you can issue this command to check all links in your Laravel app.
php artisan link-checker:run
This can of course be automated by scheduling the command and optionally mailing a report of broken links to you. Want to get notified in some other way (for example on Slack Or HipChat)? Just created create your own reporter.
Learn more about laravel-link-checker by going over the readme on GitHub.