Laravel 4 is amazing. It has made development fun again, the same way CodeIgniter did for me a few years ago. Sadly, many developers are abandoning CodeIgniter, and even Ellis Lab seems content to let it fade quietly into the night.
I recently needed to know which version of Laravel 4 was installed on my development machine vs. my staging server for some debugging. I never did find anywhere in the Laravel 4 documentation where I could locate this information, and my Google-Fu was not helping much either. Eventually I did find this information by browsing the core source files, so I thought I would write up a quick blog post for anyone else looking for an answer to this question.
You can look in vendor\laravel\framework\src\Illuminate\Foundation\Application.php.
Near the top of the class you should see the following constant defined:
* The Laravel framework version.
* @var string
const VERSION = '4.0.7';