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Frequently Asked Laravel Development Questions:

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Our collection of 50 questions covers a wide range of subjects, such as the basics of Laravel, managing databases, routing, middleware, authentication and authorization, testing, caching, performance optimization, output-based questions, and many others. Each question is tailored to evaluate your comprehension of Laravel concepts, industry standards, and your capacity to apply them in practical situations.

If you want to work as a Laravel developer, you will find these questions useful:

  • Front end developer
  • Back end developer
  • Full stack developer
  • Laravel developer
  • PHP developer

Listed below are several commonly asked Larvel interview questions regarding Larvel:

Q1. What is Laravel?
Q2. What are the advantages of using Laravel?
Q3. What is Composer, and how is it used in Laravel?
Q4. Explain the Laravel directory structure.
Q5. What is the purpose of the .env file in Laravel?
Q6. What is migration in Laravel?
Q7. How do you create a migration in Laravel?
Q8. How do you run migrations in Laravel?
Q9. What are Eloquent models in Laravel?
Q10. How do you define a relationship between two Eloquent models?

We have classified the Laravel Development interview questions into three categories:

1. Larvel Basic Laravel Interview Questions for Freshers

2. Intermediate Laravel Interview Questions

3. Laravel Advance Interview Questions

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Basic Laravel Development Interview Questions

To begin with, let’s examine a set of commonly asked Laravel interview questions that are relatively straightforward. These inquiries generally revolve around defining concepts and providing examples. They aim to assess your fundamental understanding of the subject matter. Before seeking assistance, attempt to answer the following questions independently to assess your level of comprehension.

1. What is Laravel?

Laravel stands as a highly popular PHP web application framework, renowned for its ability to equip developers with a broad range of tools and features. With Laravel, developers gain access to a robust suite of capabilities, empowering them to construct dynamic and scalable web applications swiftly and effectively.

Adhering to the Model-View-Controller (MVC) architectural pattern, Laravel ensures clean code organization and facilitates the inclusion of essential functionalities such as routing, authentication, caching, and database migration.

2. What are the advantages of using Laravel?

Laravel is a popular PHP framework for web application development that offers numerous benefits:

  • MVC Architecture: Laravel encourages the separation of concerns by implementing the MVC pattern. Models represent the data and business logic, views handle the presentation layer, and controllers manage the application flow.
  • Routing: Laravel provides a powerful routing system that allows developers to define clean and easily understandable URLs for their application. Routing determines how an application responds to HTTP requests.
  • Blade Templating Engine: It is a templating engine that empowers programmers to construct reusable view templates. Blade encompasses a range of powerful features such as sections, control structures, and template inheritance, all of which contribute to the ease of designing dynamic and reusable views. With Blade, developers can effortlessly create modular and flexible view templates, simplifying the process of building dynamic user interfaces.
  • Database Migrations: Laravel provides a database migration system that enables developers to effectively handle and track changes to the database schema as the application evolves.

Migrations offer a version control-like mechanism for the database, simplifying the creation, modification, and rollback of database structures. With Laravel’s migration system, developers can seamlessly manage and adapt the database schema, ensuring a smooth and controlled evolution of their application’s data layer.

  • Authentication and Authorization: Laravel offers a robust system for user authentication and authorization, providing a reliable solution for managing user-related functionalities.

This inclusive package encompasses features such as user registration, login, password reset, and role-based permissions, streamlining the implementation of secure user management.

By leveraging Laravel’s comprehensive user authentication and authorization capabilities, developers can effortlessly ensure the integrity and security of their application’s user-related operations.

  • Caching and Performance: Laravel presents caching mechanisms that enhance the performance of web applications by providing efficient data storage and retrieval.

With support for diverse caching drivers, including renowned systems like Memcached and Redis, developers can effectively cache frequently accessed data, significantly accelerating their applications.

By leveraging Laravel’s caching capabilities, developers can optimize their web applications, improving responsiveness and overall user experience.

3. What is Composer, and how is it used in Laravel?

Composer is a tool used for managing dependencies in PHP. In order to manage its package dependencies and autoload classes, Laravel makes use of Composer.

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4. Explain the Laravel directory structure.

The directory structure of Laravel is designed in a highly organized manner. The important directories within this structure include app, which holds the core code of the application; resources, which contains views, assets, and language files; public, which serves as the document root; and routes, which contains route definitions.

5. What is the purpose of the .env file in Laravel?

The.env file’s purpose is to enable developers to easily switch between different environments without modifying the code, providing more flexibility and convenience in managing the application’s configuration settings.

6. What is migration in Laravel?

Migrations in Laravel provide a simple way to change the database schema with PHP code. It makes it simpler to handle database changes and maintain them in sync with the application’s coding since it lets you add, alter, and delete database tables and fields.

7. How do you create a migration in Laravel?

In Laravel, to create a migration, we use the below-mentioned command:

php artisan make:migration create_table_name --create=table_name

8. How do you run migrations in Laravel?

To execute migrations in Laravel, you can use the migrate Artisan command. Running the command “php artisan migrate” will execute all pending migrations and update the database schema accordingly. This ensures that the database is in sync with the application’s codebase.

9. What are Eloquent models in Laravel?

Laravel provides Eloquent, its own ORM system, which enables developers to handle database tables using object-oriented model classes. Eloquent has an expressive syntax, making database interaction in Laravel more straightforward and intuitive.

10. How do you define a relationship between two Eloquent models?

In Eloquent, you can define relationships between models using methods like hasOne, hasMany, belongsTo, and belongsToMany. These methods establish the relationships between the models and provide an easy way to perform queries that involve related data. For instance, you can use the hasMany method to define a one-to-many relationship between two models, allowing

11. What are Laravel middlewares?

In Laravel, middlewares provide a convenient way to filter incoming HTTP requests to your application. They can be used to perform various tasks such as authentication, authorization, and request manipulation.

Middleware is executed before the request is processed by the application, making it useful for implementing cross-cutting concerns that apply to multiple routes or controllers.

12. How do you create middleware in Laravel?

To create a middleware in Laravel, you can use the make:middleware Artisan command. For example, running the command, “php artisan make:middleware CheckAdminRole” will generate a middleware class called CheckAdminRole. This middleware can be used to check if the authenticated user has the “admin” role and can be applied to specific routes or controllers to enforce access control.

13. Explain the concept of route caching in Laravel.

In Laravel, route caching is a technique that can significantly improve the performance of route registration. By caching the routes, Laravel can quickly determine the appropriate route for an incoming request, leading to faster application response times. This is because the overhead of loading and parsing route definitions is eliminated, and the cached routes can be loaded directly from the cache on subsequent requests.

14. What is the purpose of the service container in Laravel?

The service container manages class dependencies and performs dependency injection. It resolves and instantiates objects as needed, making it easier to manage dependencies across the application. The container automatically injects dependencies into a class’s constructor or method parameters based on their type-hinted dependencies, reducing the need for manual dependency injection and making the code more maintainable.

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15. How do you handle form validation in Laravel?

In Laravel, form validation can be handled by creating a “form request” class using the artisan command line tool.

This class contains a “rules” method where you can define the validation rules for the form fields. Then, in the corresponding controller method, you can type-hint the form request class as a parameter.

Laravel will automatically validate the form data and redirect back to the form with errors if any of the validation rules fail.

Alternatively, you can use the “validate” method within a controller to validate the form data directly. This method takes an array of validation rules and the form data to be validated, and it will throw a validation exception if any of the rules fail.

16. What are facades in Laravel?

In the Laravel framework, facades offer a straightforward and user-friendly approach to accessing services registered within the service container.

A facade acts as a static interface to a service, allowing you to invoke its methods directly without the need to instantiate the underlying class. Laravel provides a range of pre-built facades, including the “Auth” facade for authentication tasks and the “DB” facade for database operations.

17. Explain the concept of eager loading in Laravel.

In Laravel, eager loading is a technique that allows developers to load relationships of a model in a single database query, reducing the number of queries executed and improving performance. This helps avoid the “N+1 problem” commonly encountered in ORM systems, where multiple queries are executed to retrieve related data for each record in a result set. By eager loading relationships, developers can improve the performance of their applications and reduce the overhead of accessing related data.

18. How do you handle file uploads in Laravel?

Handling file uploads typically involves the following steps:

  • Prepare the HTML form: Create an HTML form with the appropriate fields to accept file uploads. Include the enctype=”multipart/form-data” attribute in the form tag to enable file uploads.
  • Handle the file upload request: Define a route and corresponding controller method to handle the file upload request. using the $request->file() method you can access the uploaded file in the controller method.
  • Validate the uploaded file: You can specify rules such as file size, file type, and other criteria to ensure the uploaded file meets your requirements.
  • Store the file: Choose a storage mechanism in Laravel to store the uploaded file. Laravel offers various storage options, including local disk storage, cloud storage (such as Amazon S3), or even a custom storage solution.
  • Update the database: You can update the relevant database records or create new records with the necessary file details.
  • Provide appropriate response: Upon completion of the file upload and processing, deliver a response to the user, notifying them about the status of the upload operation, whether it was successful or unsuccessful.

19. What is the purpose of the Artisan command line tool in Laravel?

The Artisan command line tool in Laravel serves as a versatile utility that empowers developers to accomplish various tasks efficiently. These tasks include code scaffolding, managing database migrations, running unit tests, and executing custom commands. By providing a convenient interface, Artisan streamlines common development tasks and automates repetitive actions, enhancing productivity within Laravel applications.

20. How do you define routes in Laravel?

The process of defining routes in Laravel involves the following steps:

  • Open the routes/web.php file in your Laravel application.
  • Use the available route methods (get, post, put, patch, delete, etc.) to define routes for different HTTP methods.
  • Specify the URL path for each route using the route method, followed by a closure or a controller method that handles the route.
  • Optionally, you can assign a name to the route using the name method, which allows you to easily reference the route in your application.
  • Save the web.php file.

Once the routes are defined, Laravel’s routing system will match incoming requests with the defined routes and execute the corresponding closure or controller method.

Intermediate Laravel Development Interview Questions

We’ll kick off our next section with slightly more challenging Laravel interview questions that are commonly posed by recruiters from leading multinational corporations. These interview questions are frequently encountered and demand an in-depth understanding of the field.

21. Explain the concept of method injection in Laravel.

With method injection in Laravel, it is possible to specify dependencies in a controller method’s parameters using type-hinting. This allows the Laravel service container to recognize and inject the required dependencies automatically whenever the method is invoked, making dependency management more convenient and less cumbersome for developers.

22. In Laravel, what does the term method chaining refer to?

Method chaining in Laravel is a practice where multiple methods are consecutively linked together in a single line of code. This technique offers a concise and fluent coding style by allowing the invocation of multiple methods on a single object without using separate lines of code.

Each method call usually returns the object itself, enabling the effortless addition of subsequent method calls. This approach enhances code readability, reduces code verbosity, and promotes a more streamlined and expressive coding experience.

23. What do you mean by Laravel collections?

Laravel collections provide a smooth and expressive method to manage arrays of data. Equipped with an extensive array of methods, collections simplify essential operations such as filtering, mapping, sorting, and reducing data.

They introduce a uniform and expressive syntax that allows effortless manipulation and transformation of data, streamlining the handling of complex datasets with enhanced readability and efficiency. With support for various iterable data types like arrays and database query results, Laravel collections offer numerous benefits in terms of improved code readability, easier maintenance, and increased developer productivity.

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24. What is the process of implementing authentication in Laravel?

To implement authentication in Laravel, we can start by configuring the database connection details in the .env file. Then, Generate authentication scaffolding using the php artisan make:auth command, which creates views, controllers, and routes for authentication. Migrate the database using php artisan migrate to create the necessary tables. Configure authentication guards and providers in the config/auth.php file to define the authentication settings.

Then, Customize authentication views in the resources/views/auth directory if desired. Protect routes with the auth middleware to restrict access to authenticated users. Utilize authentication features like Auth::user() to retrieve the authenticated user and Auth::logout() to log out users. Finally, customize authentication logic by modifying controllers, models, and middleware to meet specific requirements.

25. What are the various forms of testing available in Laravel?

In Laravel, there are multiple testing approaches available, such as unit testing, feature testing, and browser testing.

  • Unit testing focuses on verifying the functionality of isolated code components.
  • Feature testing enables the evaluation of broader sections of the application by simulating user interactions and confirming expected outcomes.
  • Browser testing, on the other hand, utilizes automated tools to assess the application’s user interface and interactions. By utilizing these diverse testing methods, Laravel ensures comprehensive coverage and enhances the overall quality and functionality of the application.

26. What is the process of caching data in Laravel?

To cache data in Laravel, first we need to configure the cache driver by selecting from options like file, database, or Redis and adjusting the configuration in the .env or config/cache.php files.

After that, we can use the Cache facade or cache helper functions to store data in the cache, specifying an expiration time or leaving it indefinite.

Then, retrieve cached data by using the same facade or helper functions with the corresponding key, and provide fallback values or closures for data generation. We can remove specific cached items by using the facade or helper functions with the appropriate key, or clear the entire cache with the cache:clear Artisan command.

27. What does task scheduling in Laravel means?

Task scheduling in Laravel encompasses the feature set offered by the framework to automate the running of recurring tasks at designated time intervals.

It provides a straightforward and expressive syntax for defining tasks and their corresponding schedules. These tasks can involve executing artisan commands, running custom closures, or triggering predefined Laravel commands. Leveraging the cron utility of the server, Laravel’s task scheduler ensures the automatic execution of scheduled tasks as per the specified timetable.

This functionality proves valuable in automating repetitive operations like database backups, periodic email dispatches, and other similar tasks, ultimately streamlining developer workflows and conserving time and effort.

28. In Laravel, how do you handle exceptions?

In Laravel, we can handle exceptions using the following techniques:

  • Using Try-Catch Blocks:

The most common way to handle exceptions in Laravel is by using try-catch blocks. We place the code that may throw an exception inside the try block, and catch the exception in the catch block.

try {

// Code that may throw an exception

} catch (Exception $e) {

// Exception handling code

}
  • Using Exception Handlers:

Laravel provides an exception-handling mechanism through the AppExceptionsHandler.php file. The Handler class contains methods for handling and reporting exceptions.

We can customize the render() method to define how exceptions should be converted into an HTTP response.

public function render($request, Throwable $exception)
{
    if ($exception instanceof CustomException) {
        // Custom logic for handling CustomException
        return response()->json(['error' => 'Custom exception occurred'], 500);
    }

    return parent::render($request, $exception);
}

  • Using Exception Responses:

Laravel allows us to define custom exception responses that will be returned when an exception occurs. This can be useful for providing a consistent and informative error response to API clients.

We can create a custom exception class that extends Laravel’s Exception class and define the desired response in the render() method.

namespace AppExceptions;

use Exception;

use IlluminateHttpJsonResponse;

class CustomException extends Exception

{

public function render($request): JsonResponse

{

return response()->json(['error' => 'Custom exception occurred'], 500);

}

}

Then, we can throw this custom exception in our code when necessary, and Laravel will automatically handle it and return the defined response.

throw new CustomException();

29. Consider the following Laravel migration file for creating a table named users. What will be the output when running this migration?

use IlluminateDatabaseMigrationsMigration;

use IlluminateDatabaseSchemaBlueprint;

use IlluminateSupportFacadesSchema;

class CreateUsersTable extends Migration

{

public function up()

{

Schema::create('users', function (Blueprint $table) {

$table->id();

$table->string('name');

$table->string('email')->unique();

$table->timestamps();

});

}

public function down()

{

Schema::dropIfExists('users');

}

}

Running this migration will create a new table named users in the database with the following columns: id (auto-incrementing), name (string), email (string, unique), and created_at/updated_at timestamps.

30. Given the following Laravel controller method, what will be the output when accessing the corresponding route?

public function index()

{

$users = User::all();

return view('users.index', ['users' => $users]);

}

When accessing the corresponding route, the index method of the controller will retrieve all the users from the database using the User model and pass them to the users.index view. The output will depend on how the view is implemented, but it typically renders a list or table of users.

31. Given the following Laravel migration file for adding a column named phone to the existing users table, what will be the output when running this migration?

use IlluminateDatabaseMigrationsMigration;

use IlluminateDatabaseSchemaBlueprint;

use IlluminateSupportFacadesSchema;

class AddPhoneColumnToUsersTable extends Migration
{

public function up()

{

Schema::table('users', function (Blueprint $table) {

$table->string('phone')->nullable();

});

}

public function down()

{

Schema::table('users', function (Blueprint $table) {

$table->dropColumn('phone');

});

}

}

Answer: Running this migration will add a new nullable column named phone to the existing users table in the database.

32. Consider the following Laravel route definition. What will be the output when accessing the URL `/users/42`?

Route::get('/users/{id}', function ($id) {

return "User ID: " . $id;

});

When accessing the URL /users/42, the output will be “User ID: 42”. The route parameter {id} will capture the value 42 and pass it as an argument to the route’s closure function.

33. Given the following Laravel controller method, what will be the output when accessing the corresponding route?

public function show(User $user)

{

return view('users.show', ['user' => $user]);

}

The show method of the controller expects an instance of the User model as a parameter.

When accessing the corresponding route, Laravel will automatically retrieve the user based on the route parameter (e.g., user ID) and pass it to the method. The output will depend on how the users.show view is implemented, but it typically renders the details of the specific user.

34. Given the following Laravel migration file for renaming a column named old_name to new_name in the users table, what will be the output when running this migration?

use IlluminateDatabaseMigrationsMigration;

use IlluminateDatabaseSchemaBlueprint;

use IlluminateSupportFacadesSchema;

class RenameColumnInUsersTable extends Migration

{

public function up()

{

Schema::table('users', function (Blueprint $table) {

$table->renameColumn('old_name', 'new_name');

});

}

public function down()

{

Schema::table('users', function (Blueprint $table) {

$table->renameColumn('new_name', 'old_name');

});

}

}

Running this migration will rename the column old_name to new_name in the users table in the database.

35. Explain the concept of route model binding in Laravel.

Route model binding is a technique that automatically injects model instances into route callbacks or controller methods based on the route parameters. This simplifies the process of retrieving model instances, as developers no longer need to manually retrieve models from the database using the route parameters.

Instead, Laravel automatically resolves the model instance based on the parameter name and type hinting in the route or controller method. This makes it easier to work with models in Laravel and reduces the amount of boilerplate code required to retrieve models based on route parameters.

36. How do you handle authentication with Laravel's built-in authentication system?

Laravel comes with a built-in authentication system that can be easily configured. The system includes features like password hashing, authentication middleware, and remember me functionality. Developers can use the make:auth Artisan command to scaffold the necessary views and routes for user registration and login.

This command generates the views and controllers required for authentication, including registration, login, password reset, and email verification. The authentication system in Laravel is highly customizable, allowing developers to extend and modify it to fit their specific needs.

Advanced Laravel Development Interview Questions

Read on in our next section for the challenging Laravel interview questions often presented by recruiters from prominent multinational corporations. These interview questions are commonly encountered and require a profound comprehension of the subject matter.

37. How do you implement authorization in Laravel using gates and policies?

Laravel offers a robust authorization system using gates and policies. Gates define user permissions for specific actions, while policies define authorization logic for model resources.

Developers can define gates and policies in the “AuthServiceProvider” and use them in their applications to control access. Gates are typically used for checking user permissions for specific actions, such as editing a post or deleting a comment.

Policies are used for more complex authorization scenarios where developers need to define rules for accessing specific model resources, such as a user’s profile or a blog post. The authorization system in Laravel is highly customizable and provides a flexible way to manage user access to applications.

38. What is the role of the app directory in a Laravel project?

The “app” directory contains the core application code, which is essential for the application’s functionality. This directory includes files such as models, controllers, middleware, and service providers. Models represent database tables and provide an interface for interacting with the data.

Controllers handle incoming requests and define the application’s logic. Middleware provides a way to filter and modify HTTP requests before they reach the application. Service providers register services and bind interfaces to their implementations. The “app” directory is a crucial part of a Laravel project, and developers spend much of their time working on files in this directory.

39. Explain the concept of service providers in Laravel.

Service providers are a fundamental part of the service container and dependency injection systems. Service providers bootstrap various components of the framework and register bindings, aliases, and configurations.

They allow for modular and extensible application development by enabling developers to register their own services and dependencies with the service container. Service providers are typically used to register additional functionality, such as third-party packages or custom application components.

They also help to keep the application organized and maintainable by separating functionality into smaller, more focused modules. Service providers are a powerful feature of Laravel that contributes to its flexibility and ease of use.

40. How do you handle database transactions in Laravel?

Laravel offers a user-friendly method to handle database transactions. By using the DB facade or the transaction method, developers can define a block of code that executes within a database transaction. This feature guarantees data integrity and provides a straightforward way to undo changes in the event of errors. With Laravel’s database transaction handling, developers can maintain the reliability and consistency of their database while ensuring that any changes made to it are safe and secure.

41. What are named routes in Laravel, and how are they useful?

Laravel’s named routes feature assigns a unique name to each route, providing a way for developers to refer to routes by their names rather than their URLs. This simplifies the process of generating URLs or redirecting to specific routes within the application.

By eliminating hard-coded URLs in the application code, named routes make it easier to maintain and update the application. Furthermore, named routes enhance the readability and organization of the routes in an application. Overall, the Laravel named routes feature is an effective mechanism for managing and navigating routes within an application.

42. Consider the following Laravel route definition: What will be the output when accessing the URL /posts/123/comments/456?

Route::get('/posts/{postId}/comments/{commentId}', function ($postId, $commentId) {

return "Post ID: " . $postId . ", Comment ID: " . $commentId;

});

When accessing the URL /posts/123/comments/456, the output will be “Post ID: 123, Comment ID: 456”. The route parameters {postId} and {commentId} will capture the values 123 and 456, respectively, and pass them as arguments to the route’s closure function.

43. Given the following Laravel controller method, what will be the output when accessing the corresponding route?

public function store(Request $request)

{

$data = $request->all();

return response()->json($data);

}

The store method of the controller expects a Request object as a parameter. When accessing the corresponding route and sending a JSON payload in the request body, the method will retrieve all the data from the request and return it as a JSON response.

44. How do you handle AJAX requests in Laravel?

Laravel provides built-in support for handling AJAX requests. You can define routes specifically for AJAX requests using the Route::post, Route::put, Route::patch, and Route::delete methods. Within your controller methods, you can return JSON responses using the response()->json() helper function or utilize the JsonResponse class.

45. What are macros in Laravel, and how do you define them?

Macros in Laravel allow you to add custom functionality to existing classes without modifying their source code. You can define macros using the Macroable trait and the macro method.

Macros can be defined for classes like collections, requests, responses, and more. They enable you to extend the behavior of Laravel’s core components and make them more versatile.

46. How do you handle error logging and debugging in Laravel?

Laravel boasts an extensive error handling and logging system. By default, Laravel records errors and exceptions in the storage/logs directory. Developers can customize the log channel, severity levels, and handlers by configuring the application.

Additionally, Laravel offers practical debugging tools such as the dd function for displaying variable contents and an error page with detailed stack traces when in development mode. Overall, Laravel’s error handling and logging system is a comprehensive and versatile tool for managing and debugging errors in an application.

47. What are service providers in Laravel, and how do you create them?

Laravel’s service providers are responsible for setting up and configuring various aspects of the framework. To create a service provider, developers can use the make:provider Artisan command, which generates a new provider class.

In the provider’s register method, developers can bind classes into the service container, register event listeners, or perform other essential setup tasks. Overall, Laravel’s service providers are classes that facilitate the setup and configuration of the framework and can be created using the make:provider Artisan command.

48. Explain the concept of method injection versus constructor injection in Laravel.

In Laravel, method injection and constructor injection are two ways to resolve dependencies and perform dependency injection. Method injection involves type-hinting the dependencies directly in the method signature, and Laravel’s container automatically resolves and injects the dependencies when invoking the method.

Constructor injection, on the other hand, involves injecting dependencies via the constructor of a class, ensuring that the class has all the required dependencies available when instantiated.

49. Explain the concept of method visibility (public, private, protected) in Laravel.

In Laravel, as in many other object-oriented programming languages, methods can have different visibility levels: public, private, and protected. Public methods can be accessed from anywhere within the class, from other classes, or outside the class. Private methods, on the other hand, can only be accessed within the class that defines them. Protected methods are similar to private methods but can also be accessed by child classes that inherit from the parent class.

50. How do you handle form requests and validation in Laravel?

Laravel offers a powerful form request validation feature. By creating a form request class, you can define validation rules and authorize the incoming request before it reaches your controller. Laravel’s form requests handle the validation logic, automatically return validation errors, and simplify the process of validating user input.

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