LARAVEL Case Studies & Practical Application 5

Question 1

A Laravel app needs to run a database-heavy report every night at 2 AM without overlapping runs if the previous job is still executing. How do you configure this in the scheduler?

Accepted Answer

Use ->dailyAt('02:00')->withoutOverlapping() on the scheduled command

Answer

withoutOverlapping() acquires a mutex lock so the scheduler skips the next run if the previous execution is still in progress.

Question 2

A React SPA fetches data from a Laravel API on a different subdomain. The browser blocks requests with a CORS error. Where do you configure allowed origins in Laravel?

Accepted Answer

In config/cors.php by setting the allowed_origins array and ensuring the HandleCors middleware is active

Answer

config/cors.php is Laravel's dedicated CORS configuration file, consumed by the bundled HandleCors middleware.

Question 3

You are profiling a slow Laravel page and suspect inefficient queries. Which built-in tool shows every query executed during a request along with its duration?

Accepted Answer

The Laravel Telescope query watcher in the local environment

Answer

Laravel Telescope's query watcher records every SQL query, its bindings, and execution time for requests in the local or staging environment.

Question 4

A user-uploaded CSV is processed by a job that creates thousands of Eloquent models. Memory usage spikes and the process is killed. What Eloquent technique reduces memory consumption?

Accepted Answer

Use cursor() or lazy() to process rows one at a time instead of loading the full collection into memory

Answer

cursor() uses a PHP generator to yield one model at a time, keeping memory usage flat regardless of dataset size.

Question 5

A team is building a microservices architecture where a Laravel service must react to events published by a Node.js service via RabbitMQ. What is the recommended approach?

Accepted Answer

Use a custom queue driver or package (e.g., vladimir-yuldashev/laravel-queue-rabbitmq) to connect Laravel's queue system to RabbitMQ

Answer

A RabbitMQ queue driver integrates natively with Laravel's queue workers, allowing jobs to be consumed from RabbitMQ queues using standard artisan queue:work.

LARAVEL - Laravel PHP Framework Practice Test

LARAVEL - Laravel PHP Framework Practice Test

LARAVEL Case Studies & Practical Application 5