Where does Symfony2 make display_errors = Off?

Question

symfony

If you paint over php (errors in syntax and further down the list), then symfony displays a blank page instead of an error, even in the dev environment. I wanted to fix this by adding the following lines to app_dev.php:

error_reporting(E_ALL);
ini_set('display_errors', 'On');
ini_set('display_startup_errors', 'On');

But the framework at some stage rewrites this business to Off. If you call exit(phpinfo()); in app_dev.php - display_errors has On as it should. And if already in the action of some controller - Off.

Answer 1

https://github.com/symfony/symfony/issues/8703
For specifics, you should specify the PHP version, but symfony itself does nothing with php settings. He only hangs up his error handler.
Was wrong. Proof.

Answer 2

In Kernel::init. Therefore, you can change in his successor.