In PhpStorm 2019.1, we’ve implemented debugging of Twig and Blade templates.
The problem was that template files are not the files your application runs. They are first compiled into regular PHP and saved to a cache directory, and then the application runs those compiled files.
So before PhpStorm 2019.1, your only option was to identify the compiled file, something like b84f5d6c0f0d85bb9187843.php, locate the line you want to place a breakpoint on, and then debug this file instead.
Luckily, things have changed, and you can now debug your template files directly – there’s no difference