Laravel 5 interview questions

Laravel 5 interview questions

Laravel is one of the most popular frameworks on Github. On Github, Laravel has 54,843+ stars which is growing day by day. Here you can 100+ Laravel interview questions that are taken from various open-source places like quora, Github, and StackOverflow

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Below are the list of Best Laravel 5 interview questions and Answers

There is quite a requisite for the installation of Laravel 6. And, below is the list of the required servers that are needed for the installment of it.

  • PHP 7.2.0 version
  • Extension of BCMath PHP
  • JSON PHP Extension
  • XML PHP Extension
  • Extension of Ctype PHP
  • Extension of Tokenizer PHP 
  • Mbstring PHP Extension
  • PDO PHP Extension
  • OpenSSL PHP

Composer is a tool to manage the dependency in PHP. Composer allows declaring the libraries of a project and the composer will install or update them for the user. It is not a package manager but deals with the libraries or packages and install them inside the project directory. The composer is downloaded by the installer in the windows and sets up a path for the environment that can be called from any directory.

The composer can be installed using a command

$curl -sS https://getcomposer.org/installer | 
sudo php -- --install-dir=/usr/local/bin --filename=composer

Laravel Homestead helps in providing you a development environment and also that too without the installation of the PHP, HHVM, web server or any such thing in your local machine. It is completely disposable. This gives you the power to destroy if anything goes wrong and then you can just reuse it or recreate the same thing in just a few minutes.

Valet can be defined as a tool that mainly helps to spin up a demo or those projects that are considered to be discardable as a breeze. The main function of valet is to combine various default software on the operating system with some creative and innovative ideas that are related to file paths and serving of PHP applications. In addition to that, they combine with some extra tools used for eliminating the requirement of modifying the /etc/hosts file.

The entire variable listed in a (.env) the file will be loaded in the $_ENV PHP when a request is received by an application. However, an ENV helper may be implemented to retrieve the values of the variables in a particular configuration file. If a Laravel configuration file is reviewed, several options can be noticed to assists these helpers in the following way:

‘Debug’=> env ('APP_DEBUG', false?),

The second value that is passed onto the env function is the default value. This value can be used if there is no environment variable present in the given key.

The maintenance mode in a Laravel can be enabled or disabled by artisan CLI.

Laravel returns a custom view that can be displayed in all requests when the website is in a maintenance mode. Thus, it becomes easier to enable or disable an application or a website while it is still under maintenance or updating.

To enable the maintenance mode in Laravel, the following artisan command should be entered into the command line:

php artisan down

To disable the maintenance mode in Laravel, the following artisan command should be executed in the command line:

php artisan up

Laravel Homestead is a pre-packaged and official Vagrant "box", that offers a great improvement environment without needing one to install HHVM, PHP, web servers or any distinct server software on your local machine.

It functions on every Mac, Linux system, Windows, Nginx web servers, PHP 7.2, PHP 7.1, PHP 7.3, PostgreSQL, Redis, MySQL, Node, Memcached and every other article one requires to improve the outstanding Laravel applications.

To install Homestead Vagrant Box, you have to unfurl git bash and execute the command "vagrant box add laravel/homestead"

Vagrant is a software that is utilized to handle the improvement environment. Via the command line, one can take any available OS, configure it, install it, work within it, run it, and additional functions. Utilizing it one can restore the manufacturing environment of one’s website or app.

To launch Vagrant Box, one has to:

  • Start and initialize the Vagrant Box.
  • Select a box then arrange the Vagrant Box. 
  • Incorporate SSH within the box and Customize It.
  • Create the box as tiny as possible. 
  • Incorporate the box within one's Vagrant install.
  • Customize the new Vagrantfile.

The Vagrantfile is a Ruby file utilized to arrange Vagrant on a per-project way. The chief function of the Vagrantfile is to explain the virtual devices needed for projects with the process of configuration and amenities of the devices.

Laravel Homestead happens to be a pre-packaged Vagrant Box that offers one a marvelous development environment san needing one to install, web servers, PHP, or any distinct server software on one's local machine. These Vagrant Boxes are fully disposable.

Homestead assists numerous kinds of sites that permits one to easily execute projects that are not founded on Laravel. The sites supported by Homestead include:

  • Symfony4.
  • Apache.
  • Laravel. 
  • Proxy. 
  • Symfony2.
  • Statamic. 
  • SilverStripe.

 

There are numerous ways to configure Cron in Homestead like:

  • Make new Artisan command and register it within the Kernel. Then execute the “PHP artisan list" command within the terminal. One will observe the command has been recorded. Command will be implemented with the sign that is kept in “protected $signature = ‘command: name'". One will observe the log message within the terminal.
  • Utilize call back or closure method: Laravel permits one to close, execute a call back utilizing the “call" process. Laravel also permits one to schedule shell commands to initiate commands to the external applications and operating system.
  • Simply after reaching the terminal add SSH to the server and cd within the project and execute the command "cronstab -e". This will ensure its opening and after pasting the code below within the file, save it and exit.

Multiple versions of PHP are supported in Homestead 6 on the same machine. In the Homestead.yaml file, the version of PHP needs to be specified before using it. The available versions of PHP are 7.1, 7.2 and 7.3.

Any of the Supported versions of PHP can be used through the CLI in the following way.

  • Php7.1 artisan list
  • Php7.2 artisan list
  • Php7.3 artisan list

Before installing Valet fulfill these below requirements:

  • Composer: One must install Composer before installing Valet.
  • PHP: Before installing Valet install PHP if it is not installed.
  • Carefully check whether one's system is not executing or running any programs or applications that bind port 80 similar to Nginx or Apache.

Now install Valet internationally with composer global require cretueusebiu/valet-windows.

Now configure Valet along with registration of Valet’s Daemon. This will launch Valet in an automated way on system setup.

Homebrew is an open-source software package management system for macOS and Linux. It helps Linux and macOS users for the installation of software in a simple manner. Homebrew is written in Ruby programming language and free to download.

Valet is a Laravel improvement environment for Mac essentialist. One can also share one's sites publicly utilizing local tunnels. It configures one's Mac to continue running Nginx in the framework when one's machine starts. Then utilizing DnsMasq Valet substitutes every appeal on the *.test domain to depict or point to websites installed in one's local machine.

Valet supports the following frameworks and cms:

  • Static HTML. 
  • Zend.
  • WordPress.
  • Laravel.
  • Craft.
  • Magento.
  • Kirby. 
  • Slim.
  • Katana. 
  • Bedrock. 
  • Contao.
  • Statamic. 
  • Symfony.
  • Concrete5.
  • Jigsaw. 
  • Joomla. 
  • Lumen.
  • OctoberCMS.

Sometimes one can have 2 classes that use a similar interface, but one wishes to administer various implementation within all classes. For instance, two controllers can depend on the various implementation of the Illuminate\Contracts\Filesystem\Filesystem Contract.

Laravel offers a simple and fluent assemblage for explaining this behavior. Thus, a contextual binding permits one to bind an execution to a selected class.

Deferred Providers in laravel are every service provider class that will be packed for your implementation. Although more of these are “deferred” providers, explaining that they will be unloaded on all requests, only during the facilities their activities are required. Hence, if one's provider is only recording bindings in the Service Container, one can wish to defer its record until one of the recorded bindings is truly required. This will enhance the performance of the applications as it is not filled from the filesystem on all requests. To defer the filling of a provider, execute the \Illuminate\Contracts\Support\DeferrableProvider interface and explain a Provides procedure. The Provides process should send back the facility container bindings recorded by the provider.

Laravel Facades act as "static proxies" to the classes that already exist in the classes in the service container, it provides the benefit of an expressive syntax while maintaining more testability and the flexibility that is different from the traditional static methods. Lavarel provides many Facades and those Facades provide access to almost all the features of Lavarel. All the Facades of Lavarel are defined inside the namespace Illuminate\Support\Facades.

You can use \Redirect::to('/new-url', 301); for 301 redirects.

example :

Route::get('old-url', function(){ 
    return Redirect::to('/bar', 301); 
});

Named routes allow the convenient generation of URLs or redirects for specific routes. You may define a name for a path by chaining the name process onto the path definition.

Example

Route::get('user/registration', function () {
    //
})->name('registration');

To list all registered routes in Laravel application you can use php artisan route:list command or also use Route::getRoutes(); method it will return a RouteCollection.

You can use url()->current(); method to get the current URL in Laravel Framework. This method returns only the URL without its parameter.If complete URLG with parameter is required then use url()->full();

Middleware in a Laravel is the bridge between the response and a request. Middleware is a type of mechanism for filtering. Middleware in Laravel verifies the authentication of the user. If the user is genuine, it redirects to the home page. If not, then the user is redirected to the login page. Each and Every middleware should be registered before using it. Parameters can also be passed through the middleware’s. The middleware is terminated after the response is sent to the browser.

There are two types of Middleware in Laravel. They are:

  • Global Middle: It executes every Http request of an application
  • Route Middleware: It is assigned to a particular route.

Terminable middleware is implemented after the request has been run and before the response is ready. The response and request object inside a terminate method of the Terminable middleware is received, but the response cannot be changed it has been returned already. When the response is on the way to a browser, terminable middleware allows executing a middleware that is processed.

If a terminate method is defined in middleware and a web server is implying the Fast CGI method, then the terminate method will be automatically executed after the response is sent to a browser.

Controller in Laravel is a class in which is responsible for controlling application execution flow. It sits between Model and view. Most of the business logic are written in the controller. In Laravel controllers are kept in the app/Http/Controllers directory.

Example Controller In Laravel

<?php

namespace App\Http\Controllers;
use Illuminate\Support\Facades\Redirect;
use Illuminate\Http\Request;

class HomeController extends Controller
{
    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
       
    }

	public function index(Request $request){
		
				
	}
}

In Laravel, we can use $request->ajax() method to check request is ajax or not.

Example:

      public function saveData(Request $request)
        {
            if($request->ajax()){
                return "Request is of Ajax Type";
            }
            return "Request is of Http type";
        }

Macros provide a way to add functionality to the classes wherein you do not have that function. It can help you to create a small reusable component that'll be possible to use it everywhere on your application.