Monolog FingersCrossedHandler

Question

I am looking into using monolog in an application I am working on but I am unsure whether I would be able to implement what I require using the FingersCrosedHandler.

I would like to only log DEBUG level messages if a message with a level of ERROR or higher is added, however I would like to see INFO messages in the log.

I have tried:

$applicationLog = new Monolog\Logger('App');
$streamHandler = new Monolog\Handler\StreamHandler(LOG_FILE, Monolog\Logger::DEBUG, false);
$fingersCrossedHandler = new Monolog\Handler\FingersCrossedHandler($streamHandler, Monolog\Logger::INFO, 0 , false);
$applicationLog->pushHandler($fingersCrossedHandler);
$applicationLog->addDebug('debug');
$applicationLog->addInfo('info');

But this adds both debug and info level messages to the log.

Is this possible to implement using the FingersCrossedHandler or would I need to create my own?

Answer 1

This was changed in version 1.11.0 of Monolog. There's now an optional 6th parameter, $passThruLevel. This parameter is the minimum level log that should always be flushed. In your case, you should set up FingersCrossed in the following manner:

use Monolog\Handler\FingersCrossedHandler;

$fingersCrossedHandler = new FingersCrossedHandler(
    $streamHandler,
    Monolog\Logger::ERROR,
    0,
    true,
    true,
    Monolog\Logger::INFO
);

This will result in INFO or higher messages always being logged, but DEBUG messages will only show up if an ERROR level or higher message has been logged.