Logging configuration in Laravel - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this Laravel logging command?

Given the following Laravel code snippet, what will be the output in the log file?

Laravel

<?php
use Illuminate\Support\Facades\Log;

Log::channel('single')->info('User login successful', ['user_id' => 42]);

A [ERROR] User login successful {"user_id":42}

B No output, because the channel 'single' is not defined

C User login successful

D [INFO] User login successful {"user_id":42}

💡 Hint

Check the default log level for the info() method and the 'single' channel behavior.

The info() method logs messages with INFO level. The 'single' channel writes to a single log file, formatting the message with context as JSON.

❓ Configuration

intermediate

Which configuration sets daily log files with 7 days retention?

In Laravel's logging configuration (config/logging.php), which option correctly configures daily logs with retention of 7 days?

A 'daily' => [ 'driver' => 'stack', 'channels' => ['single'], 'days' => 7 ]

B 'daily' => [ 'driver' => 'daily', 'path' => storage_path('logs/laravel.log'), 'days' => 7 ]

C 'daily' => [ 'driver' => 'daily', 'path' => storage_path('logs/laravel.log'), 'days' => 30 ]

D 'daily' => [ 'driver' => 'single', 'path' => storage_path('logs/laravel.log'), 'days' => 7 ]

💡 Hint

The 'daily' driver creates a new log file each day and supports 'days' for retention.

The 'daily' driver with 'days' => 7 keeps logs for 7 days. 'single' driver does not support 'days'. 'stack' is for combining channels.

❓ Troubleshoot

advanced

Why does Laravel not log to Slack channel?

A Laravel app is configured to log errors to Slack using the 'slack' channel, but no messages appear in Slack. What is the most likely cause?

A The log level is set to 'debug' instead of 'error'.

B The 'slack' driver is not supported by Laravel.

C The Slack webhook URL is missing or incorrect in the logging config.

D The app is running in local environment which disables all logging.

💡 Hint

Check the webhook URL configuration for Slack channel.

Slack logging requires a valid webhook URL. Without it, messages won't be sent. The 'slack' driver is supported. Log level and environment may affect logging but missing webhook is most common cause.

🔀 Workflow

advanced

Order the steps to add a custom log channel in Laravel

Arrange these steps in the correct order to add a custom log channel that writes to a daily rotating file with JSON formatting.

A 2,3,1,4

B 3,2,1,4

C 2,1,3,4

D 1,2,3,4

💡 Hint

Think about defining the tap class before referencing it in config.

First create the tap class (2), register it if needed (3), then add the channel config referencing the tap (1), finally use the channel (4).

✅ Best Practice

expert

Which practice improves Laravel logging performance in high traffic?

In a high traffic Laravel application, which logging practice best improves performance without losing critical logs?

A Use asynchronous logging with a queue to handle log writes.

B Log all messages synchronously to a single file to avoid missing logs.

C Disable logging in production to save resources.

D Use the 'error' log level for all messages to reduce log size.

💡 Hint

Consider how to avoid blocking requests while logging.

Asynchronous logging via queues offloads log writing from request cycle, improving performance. Synchronous logging can slow requests. Disabling logging loses data. Using only 'error' level misses important info.