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Backend Frameworks

Laravel Interview Questions and Answers

Study Laravel interview questions on the service container, Eloquent, queues, events, middleware, validation, testing, and application architecture.

  1. 01

    What does Laravel’s service container do?

    The service container resolves class dependencies and stores bindings between abstractions and implementations. Constructor injection makes dependencies explicit and allows implementations to be replaced for testing or different environments.

  2. 02

    How can N+1 query problems occur in Eloquent?

    Question codephp
    $users = User::all();

foreach ($users as $user) {
    echo $user->posts->count();
}

    They occur when a relationship is queried separately for every model in a collection. Eager loading or a purpose-built query can reduce the work, but the final SQL and data volume should still be inspected.

    Answer codephp
    $users = User::query()
    ->withCount('posts')
    ->get();

foreach ($users as $user) {
    echo $user->posts_count;
}
  3. 03

    When should a job be placed on a queue?

    Queue work that does not need to finish during the request, may take time, or benefits from retry and independent scaling. Jobs should be idempotent where possible and define sensible retry, timeout, and failure behavior.

  4. 04

    What is middleware used for in Laravel?

    Middleware handles cross-cutting request and response concerns such as authentication, authorization gates, throttling, locale, and headers. Business logic that belongs to a use case should not be hidden inside middleware.

  5. 05

    How should validation and authorization be separated?

    Validation determines whether input has an acceptable shape and value, while authorization determines whether the current actor may perform the operation. Both should run before domain changes are committed.

  6. 06

    What makes a Laravel test suite valuable?

    It protects important behavior at the right boundaries: focused unit tests for domain logic and feature tests for HTTP, database, queue, and authorization flows. Tests should remain deterministic and communicate intent.

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