Laravel Interview Questions

Prepare better with the best interview questions and answers, and walk away with top interview tips. These interview questions and answers will boost your core interview skills and help you perform better. Be smarter with every interview.

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Beginner

Laravel is an open-source PHP web framework. It is a powerful MVC PHP framework, designed for developers to create full-featured web applications. 

The development of web applications following the model–view–controller (MVC) architectural pattern. The features of Laravel is a module packaging system with a dedicated dependency manager. 

It also has different ways for accessing relational databases, utilities that aid in application deployment and maintenance.

The MVC Framework is a model view controller framework. It divides the application into three main logical components: the model, the view, and the controller.

The Model component relates to all the data-related logic that the user works with. The model is responsible for getting data from a database, packaging it in data objects that can be understood by other components, and delivering those objects.

The View component is used for all the UI logic of the application. It is where the data provided by the model is presented to the user. 

Controllers act as an interface between Model and View components. The controller is how the user interacts with the application. Usually, the controller takes user requests from the interface and calls the model, which retrieves and processes the data, before returning it to the controller.

Composer is a management tool in laravel. It is a tool for dependency management. It allows us to declare and manage the libraries within the project depends on. It provides a standard format for managing dependencies of PHP software and required libraries. 

Composer is an integral part of several popular open-source PHP projects, including Laravel.

.htaccess is the Hypertext Access. .htaccess is a configuration file for use on web servers running the Apache Web Server software.

These .htaccess files can be used to alter the configuration of the Apache Web Server software to enable and disable additional functionality and features that the Apache Web Server software has to offer.

composer.php runs through the command line and installs dependencies (e.g. libraries) for an application. It helps us installing/updating various components in app in Laravel framework. 

It provides a standard format for managing dependencies of PHP software and required libraries. Everytime when setup the project same version of software and libraries will be installed.

A session is a way to store information in different variables and that are to be used across multiple pages. In laravel, sessions provide a way to store information about the user across multiple requests. Laravel ships with a variety of session backends that are accessed through an expressive, unified API.

Middleware acts as a bridge between a request and a response from the user. Laravel includes a middleware that verifies whether the user of the application is authenticated or not. If the user is authenticated, it redirects to the home page otherwise, if not, it redirects to the login page.

php artisan serve

php artisan serve --port=8080

composer create-project laravel <laravel-project-name>

Migrations are like version control for your database. It allows 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.

Helpers in Laravel are built-in utility functions that we can call from anywhere within our application. There are plenty of helpers available in the core of the Laravel framework. They are grouped together based on the functionality they provide. Some helpers are array, paths, urls, strings and many more.

GET- In GET Request, only limited amount of data can be sent because data is sent in header. Get request is not secured because data is embedded with URL. On server side, It requests the data from a specified resource.

POST- In POST Request, The large amount of data can be sent because data is sent in body. Get request is secured because data is not embedded with URL. On server side, It submits the processed data to a specified resource.

In laravel, @include helps to load multiple template view files. In other words, It allows you to include a view from within another view. So the user loads multiple files in a single view.  It allows to include multiple view file in the single web page. 

Laravel provided us some built-in functions and these functions can be called from anywhere in the applications. These functions are categories on the based of functionalities. 

In laravel, we create the helper file in project on this path:  app/Helpers/Helper.php.

The most basic Laravel routes accept a URI and a Closure, providing a very simple and expressive method of defining routes. It makes the routes easy and convenient to understand and working on it.

Route::get(‘foo’, function () {
return ‘Hello World’;
});

Laravel provides various router methods. These are as follows:

Route::get($uri, $callback);
Route::post($uri, $callback);
Route::put($uri, $callback);
Route::patch($uri, $callback);
Route::delete($uri, $callback);
Route::options($uri, $callback); 

In laravel, when we are defining a route that redirects to another URI then we have to use the Route::redirect method.
Syntax:

Route::redirect(‘/<fromURL>’, ‘/<toURL>’, <errorCode>); 

Render Method is applied to a view. It will generate the corresponding raw html and store the result in a variable. The render method is responsible for converting a given exception into an HTTP response that should be sent back to the browser.
The main purpose is returning HTML content to ajax calls.

Laravel supports four databases and these are as follows:
MySQL
PostgreSQL
SQLite
SQL Server

A cookie is a small file that the server embeds on the user's computer. Each time the same computer requests a page with a browser, it will send the cookie too. Basically, it uses to identify the user.

Advanced

Request Class is used for validations in laravel. “use Request;”  statement at the top of your class file.

URI and a Closure provides a simple and expressive method of defining routes. It makes the routes easy and convenient to understand and work on it.

CSRF is the cross-site request forgery

CSRF is a type of malicious exploit whereby unauthorized commands are performed on behalf of an authenticated user. Laravel automatically generates a CSRF "token" for each active user session managed by the application.

Blade is the simple templating engine provided with Laravel. Blade allows us to use plain PHP code in our views. All Blade views are compiled into plain PHP code and cached until they are modified.

Blade view files use the .blade.php file extension.

Reverse routing is the process of generating the URL that would lead to a route, given a symbolic reference to the route.
Similarly, In Laravel reverse routing is generating URL's based on route declarations. It defines a relationship between links and Laravel routes. 

Reverse routing makes your application so much more flexible and helps the developer to write cleaner codes in View. 

app.php file found in the config folder i.e. config/app.php file. It contains several options such as timezone and locale.  

Environment variables the special variables that allow the developers to set sensitive credentials from their source code and to use different configuration variables based on their working environment.

We wrap the variable in curly braces when we need to access php variables in the view templates file. 

Example: 

{{<phpVariable> }}

With this in our html file, you can get access the php variables.

Macro is a new feature in Laravel. It offers many relationships with the database. It provides the flexibility of fetching just a single instance of a hasMany() relationship by defining it in one place and then to utilize it for any related tables in the database with a one-to-many relationship.

This makes the process of defining relationships and retrieving related models very simple.

Custom validations are the rules and protocols made by the developer for validating data. Laravel provides a variety of helpful validation rules but we need several custom error messages for validation instead of those defaults.

php artisan migrate

php artisan make:migration create_users_table

Every event has an action. An event is an action or occurrence recognized by a program that is handled by the program or code. Similarly, in laravel, Events provides a simple observer implementation. It allows us to subscribe and listen for various events/actions that occur in our application.

Lumen is micro-framework by Laravel. It is for creating smart, powerful and fast API’s. Lumen is built on top components of Laravel.

Lumen is a micro-framework not a complete web framework like Laravel and used for creating API’s only, so most of the components as HTTP sessions, cookies, and templating are excluded from Lumen. 

It has features like routing, logging, caching, queues, validation, error handling, database abstraction, controllers, middleware, dependency injection, Blade templating, command scheduler, the service container, and the Eloquent ORM are kept.

Facades provide various benefits like they provide a terse, memorable syntax that allows us to use Laravel’s features without remembering long class names configured manually. 

Also, it provides us a unique usage of PHP’s dynamic methods and that are easy to test.

In Laravel, all routes and controllers should return a response and that response is to be sent back to the client browser. Laravel provides several different ways to return responses. 
The most basic response is returning a string from a route or controller.

View routes are the routes that return a view. We use the view routes when our route only needs to return a view. 
For that you have to use the Route::view method.

Laravel automatically generates a CSRF "token" for each active user session managed by the application. This token is used to verify that the authenticated user is the one actually making the requests to the application.

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Prepare better with the best interview questions and answers, and walk away with top interview tips. These interview questions and answers will boost your core interview skills and help you perform better. Be smarter with every interview.
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