Laravel Interview Questions : Laravel is a free, open-source PHP web framework, created by Taylor Otwell and intended for the development of web applications following the model–view–controller (MVC) architectural pattern.
Laravel was created by Taylor Otwell. Laravel’s first beta version was released in June 2011. Laravel 2 was released in September 2011.
Laravel Interview Questions And Answers
1. What is Laravel?
Laravel is a free open source “PHP framework” based on the MVC design pattern.It is created by Taylor Otwell. Laravel provides expressive and elegant syntax that helps in creating a wonderful web application easily and quickly.
2- How to implement you own package in Laravel?
You can create a package in laravel using the following steps:
1. Package folder and name
2. Composer.json file for the package
3. Loading package via main composer.json and PSR-4
4. Creating a Service Provider
5. Create a Controller for your package
6. Create our Routes.php file
3- What is Laravel Horizon?
Laravel Horizon provides a beautiful dashboard and code-driven configuration for your Redis queues.
4- List some Aggregates methods provided by query builder in Laravel ?
- count()
- max()
- min()
- avg()
- sum()
5- What is Laravel Dusk?
Laravel Dusk provides an expressive, easy-to-use browser automation and testing API. You’ll love it.
6- What is Laravel Echo?
Event broadcasting, evolved. Bring the power of WebSockets to your application without the complexity.
7- How do you install Laravel?
Laravel utilizes Composer to manage its dependencies. So, before using Laravel, make sure we have Composer installed on your machine.
8- What is Composer Tool?
Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you.
9- How to use custom table in Laravel Modal ?
You can use custom table in Laravel by overriding protected $table property of Eloquent.
Below is sample uses
class User extends Eloquent{
protected $table="my_user_table";
} 10- Explain Bundles in Laravel?
In Laravel, bundles are also called packages.Packages are the primary way to extend the functionality of Laravel. Packages might be anything from a great way to work with dates like Carbon, or an entire BDD testing framework like Behat.
11- What is Laravel service container?
The Laravel service container is a powerful tool for managing class dependencies and performing dependency injection. Dependency injection is a fancy phrase that essentially means this: class dependencies are “injected” into the class via the constructor or, in some cases, “setter” methods.
12- What is Binding?
Within a service provider, we always have access to the container via the $this->app property. We can register a binding using the bind method, passing the class or interface name that we wish to register along with a Closure that returns an instance of the class:
$this->app->bind(‘HelpSpot\API’, function ($app) {
return new HelpSpot\API($app->make(‘HttpClient’));
});
13- Does Laravel support caching?
Yes, Laravel supports popular caching backends like Memcached and Redis.
By default, Laravel is configured to use the file cache driver, which stores the serialized, cached objects in the file system.
14- How to check Laravel version?
- Open the folder Vendor.
- Go to Laravel and then to Framework.
- In SRC, click on Illuminate.
- Open Applications from Foundation.
- The version will be displayed here.
15- How to update composer in laravel?
- In the composer.json file at the root of your git repo, run the composer update.
- Re-generate the composer.lock file.
- Transfer the composer.lock file to the git repository.
- Click on Toolsin the Engine Yard Cloud and go to Dashboard.
- Select an environment name.
- Click on Deploy.
16- How to run laravel project in xampp?
The steps to run Laravel in xampp are-
- Instal xampp in C drive.
- Create a Laravel folder in htdocs under the xampp folder in C drive.
- Redirect to Laravel with cmd prompt.
- Use the below command
composer create-project laravel/laravel first-project --prefer-dist- Redirect to localhost/laravel/first-project/public/.
17- How do you register service providers?
To register your provider, add it to the array:
‘providers’ => [
// Other Service Providers
App\Providers\ComposerServiceProvider::class,],
18- What are Facades?
Facades provide a “static” interface to classes that are available in the application’s service container.
19- What is CSRF Protection?
Laravel makes it easy to protect your application from cross-site request forgery (CSRF) attacks. Cross-site request forgeries are a type of malicious exploit whereby unauthorized commands are performed on behalf of an authenticated user.
20- What is reverse routing in Laravel?
Laravel reverse routing is generating URL’s based on route declarations. Reverse routing makes your application so much more flexible. It defines a relationship between links and Laravel routes. When a link is created by using names of existing routes, appropriate Uri’s are created automatically by Laravel. Here is an example of reverse routing.
// route declaration
Route::get(‘login’, ‘[email protected]’);
Using reverse routing we can create a link to it and pass in any parameters that we have defined. Optional parameters, if not supplied, are removed from the generated link.
{{ HTML::link_to_action('[email protected]') }}21- How to turn off CRSF protection for specific route in Laravel?
To turn off CRSF protection in Laravel add following codes in “app/Http/Middleware/VerifyCsrfToken.php”
//add an array of Routes to skip CSRF check
private $exceptUrls = ['controller/route1', 'controller/route2'];
//modify this function
public function handle($request, Closure $next) {
//add this condition foreach($this->exceptUrls as $route) {
if ($request->is($route)) {
return $next($request);
}
}
return parent::handle($request, $next);
} 22- What are traits in Laravel?
PHP Traits are simply a group of methods that you want include within another class. A Trait, like an abstract class cannot be instantiated by itself.Trait are created to reduce the limitations of single inheritance in PHP by enabling a developer to reuse sets of methods freely in several independent classes living in different class hierarchies.
Here is an example of trait.
trait Sharable {
public function share($item)
{
return 'share this item';
}
}23- What are Laravel eloquent?
Laravel’s Eloquent ORM is simple Active Record implementation for working with your database. Laravel provide many different ways to interact with your database, Eloquent is most notable of them. Each database table has a corresponding “Model” which is used to interact with that table. Models allow you to query for data in your tables, as well as insert new records into the table.
Below is sample usage for querying and inserting new records in Database with Eloquent.
// Querying or finding records from products table where tag is 'new'
$products= Product::where('tag','new');
// Inserting new record
$product =new Product;
$product->title="Iphone 7";
$product->price="$700";
$product->tag='iphone';
$product->save();24- Explain Facades in Laravel ?
Laravel Facades provides a static like an interface to classes that are available in the application’s service container. Laravel self-ships with many facades which provide access to almost all features of Laravel ’s. Laravel facades serve as “static proxies” to underlying classes in the service container and provide benefits of a terse, expressive syntax while maintaining more testability and flexibility than traditional static methods of classes. All of Laravel’s facades are defined in the Illuminate\Support\Facades namespace. You can easily access a facade like so:
use Illuminate\Support\Facades\Cache;
Route::get('/cache', function () {
return Cache::get('key');
});25- What are Laravel Contract’s ?
Laravel’s Contracts are nothing but a set of interfaces that define the core services provided by the Laravel framework.
26- What are service providers in Laravel ?
Service Providers are central place where all laravel application is bootstrapped . Your application as well all Laravel core services are also bootstrapped by service providers.
All service providers extend the Illuminate\Support\ServiceProvider class. Most service providers contain a register and a boot method. Within the register method, you should only bind things into the service container. You should never attempt to register any event listeners, routes, or any other piece of functionality within the register method.
27- Explain validations in laravel?
In Programming validations are a handy way to ensure that your data is always in a clean and expected format before it gets into your database. Laravel provides several different ways to validate your application incoming data.By default Laravel’s base controller class uses a ValidatesRequeststrait which provides a convenient method to validate all incoming HTTP requests coming from client.
28- What is composer ?
Composer is a tool for managing dependency in PHP. It allows you to declare the libraries on which your project depends on and will manage (install/update) them for you.
Laravel utilizes Composer to manage its dependencies.
29- What are pros and cons of using Laravel Framework?
Pros of using Laravel Framework
- Laravel framework has in-built lightweight blade template engine to speed up compiling task and create layouts with dynamic content easily.
- Hassles code reusability.
- Eloquent ORM with PHP active record implementation
- Built in command line tool “Artisan” for creating a code skeleton , database structure and build their migration
Cons of using laravel Framework
- Development process requires you to work with standards and should have real understanding of programming
- Laravel is new framework and composer is not so strong in compare to npm (for node.js), ruby gems and python pip.
- Development in laravel is not so fast in compare to ruby on rails.
- Laravel is lightweight so it has less inbuilt support in compare to django and rails. But this problem can be solved by integrating third party tools, but for large and very custom websites it may be a tedious task
30- What is database migration? And how to use it to add insert initial data to database?
Migrations are like version control for your database, allowing your team to easily modify and share the application’s database schema. Migrations are typically paired with Laravel’s schema builder to easily build your application’s database schema. If you have ever had to tell a teammate to manually add a column to their local database schema, you’ve faced the problem that database migrations solve.
Laravel includes a simple method of seeding your database with test data using seed classes. All seed classes are stored in the database/seeds directory. Seed classes may have any name you wish, but probably should follow some sensible convention, such as UsersTableSeeder, etc. By default, a DatabaseSeeder class is defined for you. From this class, you may use the call method to run other seed classes, allowing you to control the seeding order.
31- What is url helper?
The url helper may be used to generate arbitrary URLs for your application. The generated URL will automatically use the scheme (HTTP or HTTPS) and host from the current request:
$post = App\Post::find(1);
echo url(“/posts/{$post->id}”);
// http://example.com/posts/1
32- Exceptions are handled by which class?
All exceptions in Laravel are handled by the App\Exceptions\Handler class. This class contains two methods: report and render.
33- What is report method?
The report method is used to log exceptions or send them to an external service like Bugsnag or Sentry. By default, the report method passes the exception to the base class where the exception is logged. However, you are free to log exceptions however you wish.
34- What is Monolog library?
Laravel utilizes the Monolog library, which provides support for a variety of powerful log handlers. Laravel makes it a cinch to configure these handlers, allowing you to mix and match them to customize your application’s log handling.
35- What is stack channel?
By default, Laravel will use the stack channel when logging messages. The stack channel is used to aggregate multiple log channels into a single channel.
36- What are Blade Templates?
Blade is the simple, yet powerful templating engine provided with Laravel. Unlike other popular PHP templating engines, Blade does not restrict you from using plain PHP code in your views.
37- Where is the authentication configuration file is located in Laravel?
The authentication configuration file is located at config/auth.php, which contains several well documented options for tweaking the behavior of the authentication services.
38- What is fluent query builder in Laravel?
Laravel’s database query builder provides a convenient, fluent interface to creating and running database queries. It can be used to perform most database operations in your application and works on all supported database systems.
39- Laravle supports which databases?
Laravel makes interacting with databases extremely simple across a variety of database backends using either raw SQL, the fluent query builder, and the Eloquent ORM. Currently, Laravel supports four databases:
MySQL
PostgreSQL
SQLite
SQL Server
40- How To Use Delete Statement In Laravel?
DB::delete(‘delete from users where id = ?’, [1015]);
41- How To Use Update Statement In Laravel?
DB::update(‘update users set city_id = 10 where id = ?’, [1015]);
42- How To Use Select Query In Laravel?
$users = DB::select(‘select * from users where city_id = ?’, 10);
if(!empty($users)){
foreach($users as $user){
}
}
43- How To Set Database Connection In Laravel?
Database configuration file path is : config/database.php
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