[feature request] ability to use a callable expression as a output parameter

[wujekbogdan]

I'd like to use an error logger (like Monolog) to log errors. So it would be great if the output parameter accepted a callable argument (like closure).

[jeckel]

Or at least a PSR-3 logger

[garethellis36]

I'd find this useful too. I've looked at the source code and I think the major issue is serialization. The callable would need to be serialized (not an issue as the library already has a dependency on the superclosure library), but so would any dependency of the callable. Taking Monolog for example, a StreamHandler cannot be serialized.

The only thing I can think of at the moment is to add an interface like Psr3LoggerFactory that the callable has to return. e.g

`output` => function () {
  return new class implements Psr3LoggerFactory {
    public function createLogger(): LoggerInterface {
       // return a PSR3 logger, e.g. Monolog
    }
  }
}

Then background job would do something like

if (is_callable($config["output"])) {
 $logger = $config["output"]();
} else {
  // log to file
}

Thoughts? cc @hellogerard