https://github.com/mahmoudsayed96/interview-questions
List of questions that i asked in interviews
https://github.com/mahmoudsayed96/interview-questions
Last synced: 4 months ago
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List of questions that i asked in interviews
- Host: GitHub
- URL: https://github.com/mahmoudsayed96/interview-questions
- Owner: MahmoudSayed96
- Created: 2021-10-09T12:58:39.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2022-06-02T20:44:39.000Z (about 4 years ago)
- Last Synced: 2025-01-23T04:29:12.397Z (over 1 year ago)
- Size: 11 MB
- Stars: 0
- Watchers: 2
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# 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
```php
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.
```php
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.
```php
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](https://www.youtube.com/watch?v=VYPfncvYW-Y&t=208s)
[Arabic](https://5dmat-web.com/ar/playlist/31/%D8%AF%D8%B1%D9%88%D8%B3_%D9%85%D8%AA%D9%82%D8%AF%D9%85%D8%A9_%D9%81%D9%8A_laravel)
11. Laravel Service Container
> Manage classes dependancies
[Arabic](https://www.youtube.com/watch?v=Tnko0sRKQUU)
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?.
```php
$products = Product::with(['category' => function ($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**
- **S**ingle Respons
- [**O**pen/Close](/open-closed-principle-php-arabic.pdf)
- [**L**iskov](liskov-substitution-principle-php-arabic.pdf)
- [**I**nterface Segregation](Interface-segregation-principle-arabic.pdf)
- [**D**ependency Inversion](dependency-inversion-principle-php-arabic.pdf)
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](https://www.youtube.com/watch?v=Lf6R5oDtkFo&list=PLSfH3ojgWsQosqpQUc28yP9jJZXrEylJY&index=4)
22. [**Faced** in laravel](https://www.youtube.com/watch?v=Ze9rS88iy0M&list=PLSfH3ojgWsQosqpQUc28yP9jJZXrEylJY&index=5)
> Faced allows us to call service instace method staticlly