Log Fatal errors in symfony - symfony

Question

I'm trying to configure an email logging in Symfony. I followed the cookbook and it works but I have a problem with Fatal errors.
Those errors aren't logged in prod mode. I figured out that when I add Debug::enable(); to app.php, the error get logged, however I still don't get an email.
Here is the relevant configuration:
mail:
type: fingers_crossed
action_level: critical
handler: buffer
buffer:
type: buffer
handler: swift
swift:
type: swift_mailer
from_email: %error_mail_from%
to_email: %error_mail_to%
subject: %error_mail_subject%
level: debug

Answer 1

This is not an easy thing to log PHP Fatal Errors, because whenever the error is thrown, PHP shutdown...
However, there is a function that can be used to do a little thing just before the process shut down : register_shutdown_function
Have a look to How do I catch a PHP Fatal Error
This is how Symfony's Debug::enable(); is doing the trick. Have a look to https://github.com/symfony/Debug/blob/master/ErrorHandler.php#L118

Answer 2

Which Symfony version are you using?
Seems like from 2.3 there's a nice improvement that allows you to do that (logging fatal errors). Have a look at this: https://github.com/symfony/symfony/pull/6474

Answer 3

I had the same problem ( fatal erros logged in production but emails not sent) and I managed to make it work adding to my config_prod.php :
services:
mydebug.debug_handlers_listener:
class: Symfony\Component\HttpKernel\EventListener\DebugHandlersListener
arguments:
- { 0:"#http_kernel", 1:'terminateWithException'}
tags:
- { name: kernel.event_subscriber }
I found that such a service is defined in \vendor\symfony\symfony\src\Symfony\Bundle\FrameworkBundle\Resources\config\debug.xml but not in debug_prod.xml.
With callback to terminateWithException it works fine in my application.