Symfony catch PHP errors in CLI command

Question

I have a Symfony 3.2 app. I created a command to run some background task. I have to know when the command finished even if it resulted in an exception or fatal error.

My first idea was to surround my code with try/catch block. I am able to catch exceptions generated in my code or in PHP libraries as PDO but not core fatal errors. Then I tried to receive the error so I pushed a handler to the app logger. Again I intercept exceptions but not fatal errors. Here is how I add the handler to the logger:

$logger = $this->getContainer()->get('logger');
$handler = $this->getContainer()->get('app.bg_command_log_handler');
$logger->pushHandler(self::$handler);

Here is the handler:

use Monolog\Handler\AbstractProcessingHandler;

class BgCommandLogHandler extends AbstractProcessingHandler
{
    protected function write(array $record)
    {
        var_dump($record);
    }
}

Symfony version is 3.2 and PHP is 5.6.

Answer 1

You can set a custom error handler with set_error_handler(), as described here.

Use your error handler to throw() exceptions when errors are raised. This way, anything that could raise a fatal error would throw an exception of your choice instead, and you'd be able to catch it.

Of course, this would affect your whole application, not only this specific command. But I think it's a good thing.

As an aside, you should really try to upgrade your PHP runtime, if possible. 5.6 has not been supported for a long while.