abhijeetaryan21/drupal-interview-questions

List of questions that i asked in interviews

interview-questions

List of questions that i asked in interviews

1 - What is Dependancy Injection?

Object dependant on another Object in example Post class depend on User class

class User {
  public $username;
  public $userAge;
  
  public function __constructor() {
  
  }
}

class Post {
  public $postTitle;
  public $postBody;
  public $user;
  public function __constructor() {
    // ...
  }
  
  public function setUser(User $user) {
    $this->user = $user;
  }
}

Why don't use class in constructor?

Becouse with each Post object created we need to pass user object to constructor.

2 - Why using localStorage in javascript to store data and not using Cookies ?

Becouse cookies send to server with each request but localStorage don't do this

3 - What is diff between Cookies and Sessions and worked in server or client?

The main difference between a session and a cookie is that session data is stored on the server, whereas cookies store data in the visitor’s browser.

Sessions are more secure than cookies as it is stored in server. Cookie can be turned off from browser.

Data stored in cookie can be stored for months or years, depending on the life span of the cookie. But the data in the session is lost when the web browser is closed.

4 - What is final class and why use it ?

The final keyword is used to prevent a class from being inherited and to prevent inherited method from being overridden. 5 - What is diff between abstract ,final and interface class ?

• Abstract class vs Interface.

  Interface using for make blueprint structure.

  Abstract cannot be instantiated.

1. Methods Type

interface: Contains only declered functions and public access.

abstract: Contains declered and implemetaion functions.

interface A
{
  public function foo();
}

abstract class B {
  public function foo(): string
  {
      return 'foo';
  }

  public abstract function buz();
}

2. Inheritance

interface: Multiple inheritance.

abstract: Single inheritance.

interface A {}
interface B {}
interface C {}
interface D extends A, B, C {}

abstract class A{}
abstract class B extends A{}

3. Properties

interface: No properties.

abstract: Has properties.

4. Access Modiferies

   interface: Public only.

   abstract: Any. Final Class.

Final Class: A class which is declared with the Final keyword is known as the final class. The final keyword is used to finalize the implementations of the classes, the methods and the variables used in this class.

The main purpose of using a final class is to prevent the class from being inherited.

6. How laravel/JWT sotre use token in server?

the Laravel JWT Auth package, that the token is still being stored on the server (using Laravel's cache system) by default

7. Reflaction Class in PHP.
8. Eger loading VS. Lazy loading in laravel.
9. Laravel Request LifeCycle.
10. Laravel Service Provider Laravel Service Provider Arabic
11. Laravel Service Container

Manage classes dependancies Arabic

12. What is Abstraction Concepts?

Abstraction is the concept of object-oriented programming that "shows" only essential attributes and "hides" unnecessary information. The main purpose of abstraction is hiding the unnecessary details from the users.

13. What is Closure Function and pass by value or refrence?.

  $products = Product::with(['category' => function ($q) use ($request) {
            // This is closure function.
            // pass by value to pass by ref using '&$request'
            return $q->where('status', 1);
   }]);

14. What is diff truncate , delete and drop in database?. TRUNCATE.

TRUNCATE Command is a Data Definition Language operation. It is used to remove all the records from a table. It deletes all the records from an existing table but not the table itself. The structure or schema of the table is preserved.

Truncate command marks the table for deallocation. This operation removes all the data from a table bypassing a number of constraints enforced on the table. MySQL does not allow the users to truncate the table which is referenced as FOREIGN KEY in another table.

DELETE.

The DELETE statement in SQL is a Data Manipulation Language(DML) Command. It is used to delete existing records from an existing table. We can delete a single record or multiple records depending on the condition specified in the query.

The conditions are specified in the WHERE clause of the DELETE statement. If we omit the WHERE clause then all of the records will be deleted and the table will be empty. The DELETE statement scans every row before deleting it. Thus it is slower as compared to TRUNCATE command. If we want to delete all the records of a table, it is preferable to use TRUNCATE in place of DELETE as the former is faster than the latter.

DROP.

DROP statement is a Data Definition Language(DDL) Command which is used to delete existing database objects. It can be used to delete databases, tables, views, triggers, etc. A DROP statement in SQL removes a component from a relational database management system (RDBMS).

15. What is csrf in laravel ?.

This CSRF token is generated automatically for each user. This token is nothing but a random string that is managed by the Laravel application to verify the user requests.

How to Use: This CSRF token protection can be applied to any HTML form in Laravel application by specifying a hidden form field of CSRF token. The requests are validated automatically by the CSRF VerifyCsrfToken middleware. There are three different ways in which you can do this. @csrf csrf_field(): This function generate hidden html element. csrf_token(): This function just gives a random string.

16. What the poroblem CROS and why happend?
17. What is OOP in PHP? OOP stands for Object-Oriented Programming.

Procedural programming is about writing procedures or functions that perform operations on the data, while object-oriented programming is about creating objects that contain both data and functions.

Object-oriented programming has several advantages over procedural programming: OOP is faster and easier to execute OOP provides a clear structure for the programs OOP helps to keep the PHP code DRY "Don't Repeat Yourself", and makes the code easier to maintain, modify and debug OOP makes it possible to create full reusable applications with less code and shorter development time.

18. SOLID

• Single Respons
• Open/Close
• Liskov
• Interface Segregation
• Dependency Inversion

19. What is MVC ?

Design pattern using to structure code design for easier maintain and add features.

20. What is ORM ?

ORM: Object Relational Mapping - Map Relational Records Into Object.

21. Service Provider

22. Faced in laravel

Faced allows us to call service instace method staticlly