use Monolog\Logger; use Monolog\Handler\StreamHandler; use Monolog\Processor\UidProcessor; $dateFormat = 'Ymd'; $logFile = __DIR__ . '/logs/app-' . date($dateFormat) . '.log'; $logger = new Logger('my_logger'); $logger->pushProcessor(new UidProcessor()); $handler = new StreamHandler($logFile, Logger::DEBUG); $logger->pushHandler($handler); $logger->info('This is a log message'); $logger->warning('This is a warning message');In this example, we create a new Monolog logger instance and configure it to use daily log files with the `$dateFormat` variable. The `$logFile` variable is then set to the path of the log file for the current day. We then add a new UidProcessor instance which adds a unique identifier to each log entry. Finally, we create a new StreamHandler instance and add it to the logger. This handler takes care of writing log entries to the file specified by `$logFile`. We then log two example messages using the `info` and `warning` methods of the logger. Package library: The package library used in this example is Monolog, which is a popular logging library for PHP.