I just switched to monolog and wanted to log my message to the PHP console instead of a file. This might seem obvious for some people, but it took me a little while to figure ou
Some extra details if you want to tweak the default message formatting at the same time:
use Monolog\Logger;
use Monolog\Formatter\LineFormatter;
use Monolog\Handler\StreamHandler;
$output = "[%datetime%] %channel%.%level_name%: %message%\n";
$formatter = new LineFormatter($output);
$streamHandler = new StreamHandler('php://stdout', Logger::DEBUG);
$streamHandler->setFormatter($formatter);
$logger = new Logger('LoggerName');
$logger->pushHandler($streamHandler);