I have a env.php file with the following line to set the error reporting level:

error_reporting(E_ALL & ~E_DEPRECATED & ~E_USER_DEPRECATED & ~E_STRICT);

This file is dumped on the composer autoload thanks to this configuration:

{
    "autoload": {
        "psr-4": { "": "src/" },
        "files": [
            "app/env.php",
            "app/AppKernel.php"
        ]
    },
    "autoload-dev": {
        "psr-4": {
            "Dev\\": "src-dev",
            "Tests\\": "tests/"
        },
        "files": [
            "app/env_dev.php",
            "vendor/symfony/symfony/src/Symfony/Component/VarDumper/Resources/functions/dump.php"
        ]
    },
}

And of course, the composer dump is called with --no-dev on the production server.

Currently, if a exception is thrown on production and deprecated error are triggered, they are logged on the production log file.

So I start with this tiny test:

require_once __DIR__.'/vendor/autoload.php';

var_dump(error_reporting());

trigger_error('This is a deprecation.', E_USER_DEPRECATED);
trigger_error('This is an error.', E_USER_ERROR);

And here is the result:

$ php current/test.php 
int(6143)
PHP Fatal error:  This is an error. in /var/www/project/prod/releases/20180221183905/test.php on line 10

It works. The deprecated error is ignored and the error_reporting value is 6143.

First, we can supposed the error_reporting is changed later. So I tried with this simple controller action:

public function failAction(): void
{
    trigger_error('Error reporting: '.error_reporting(), E_USER_DEPRECATED);
    throw new \Exception('Test exception with error reporting: '.error_reporting());
}

After a call of this action, I have the following log:

$ grep -B1 'Test exception' shared/var/logs/prod-2018-02.log 
[2018-02-22 11:16:37] php.INFO: User Deprecated: Error reporting: 6143 {"exception":"[object] (ErrorException(code: 0): User Deprecated: Error reporting: 6143 at /var/www/project/prod/releases/20180221183905/src/AppBundle/Controller/DefaultController.php:167)"} []
[2018-02-22 11:16:37] request.CRITICAL: Uncaught PHP Exception Exception: "Test exception with error reporting: 6143" at /var/www/project/prod/releases/20180221183905/src/AppBundle/Controller/DefaultController.php line 168 {"exception":"[object] (Exception(code: 0): Test exception with error reporting: 6143 at /var/www/project/prod/releases/20180221183905/src/AppBundle/Controller/DefaultController.php:168)"} []

As you can see, both deprecation and error are logged and the error_reporting value is still the same: 6143

This is why I'm thinking about a bug, because the error reporting level does not change so the deprecation should not be reported.

If you think it is not, I'm curious to know what is the issue. 😄