# PHP OOP Essentials (Laravel)

> Classes, objects, visibility, inheritance, traits, interfaces, abstract classes, static members

- 20 interview questions
- Junior
- [Interview Questions: Laravel](https://sharpskill.dev/en/technologies/laravel/interview-questions.md)

## 1. What is a class in PHP?

**Answer**

A class is a blueprint that defines the properties and methods of an object. It encapsulates data (properties) and behaviors (methods) in a reusable structure. Classes allow creating multiple instances (objects) with the same structure but different values.

## 2. How to create an instance of a class in PHP?

**Answer**

The 'new' keyword allows instantiating a class and creating an object. For example, 'new User()' creates a new instance of the User class. If the class has a constructor, arguments can be passed directly: 'new User("John")', which automatically calls __construct() with the provided parameters.

## 3. What is the difference between a 'public' and 'private' property in PHP?

**Answer**

A 'public' property is accessible from outside the class (via the object or in child classes), while a 'private' property is accessible only from the class that defines it. Using 'private' encapsulates data and prevents direct access, forcing the use of getters/setters to control data manipulation. This is a recommended practice to protect data integrity.

## 17 more questions available

- What is the role of 'protected' visibility in PHP?
- How to define a constructor in PHP?

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## Other Laravel interview topics

- [PHP Basics](https://sharpskill.dev/en/technologies/laravel/interview-questions/php-basics.md): 25 questions, Junior
- [Composer & Autoloading](https://sharpskill.dev/en/technologies/laravel/interview-questions/composer-autoloading.md): 18 questions, Junior
- [Laravel Fundamentals](https://sharpskill.dev/en/technologies/laravel/interview-questions/laravel-fundamentals.md): 20 questions, Junior
- [Laravel Routing](https://sharpskill.dev/en/technologies/laravel/interview-questions/laravel-routing.md): 20 questions, Junior
- [Blade Templates](https://sharpskill.dev/en/technologies/laravel/interview-questions/blade-templates.md): 18 questions, Junior
- [Request & Response](https://sharpskill.dev/en/technologies/laravel/interview-questions/request-response.md): 20 questions, Junior
- [Eloquent ORM Basics](https://sharpskill.dev/en/technologies/laravel/interview-questions/eloquent-orm-basics.md): 22 questions, Junior
- [Eloquent Relationships](https://sharpskill.dev/en/technologies/laravel/interview-questions/eloquent-relationships.md): 25 questions, Mid-Level
- [Migrations & Schema Builder](https://sharpskill.dev/en/technologies/laravel/interview-questions/database-migrations.md): 20 questions, Mid-Level
- [Validation & Forms](https://sharpskill.dev/en/technologies/laravel/interview-questions/validation-forms.md): 22 questions, Mid-Level
- [Authentication](https://sharpskill.dev/en/technologies/laravel/interview-questions/authentication.md): 20 questions, Mid-Level
- [Authorization & Policies](https://sharpskill.dev/en/technologies/laravel/interview-questions/authorization-policies.md): 18 questions, Mid-Level
- [API Resources & Authentication](https://sharpskill.dev/en/technologies/laravel/interview-questions/api-resources-authentication.md): 26 questions, Mid-Level
- [Middleware](https://sharpskill.dev/en/technologies/laravel/interview-questions/middleware.md): 18 questions, Mid-Level
- [Service Container & DI](https://sharpskill.dev/en/technologies/laravel/interview-questions/service-container-di.md): 20 questions, Mid-Level
- [Queues & Jobs](https://sharpskill.dev/en/technologies/laravel/interview-questions/queues-jobs.md): 22 questions, Mid-Level
- [Events & Listeners](https://sharpskill.dev/en/technologies/laravel/interview-questions/events-listeners.md): 18 questions, Mid-Level
- [Notifications & Mail](https://sharpskill.dev/en/technologies/laravel/interview-questions/notifications-mail.md): 20 questions, Mid-Level
- [File Storage](https://sharpskill.dev/en/technologies/laravel/interview-questions/file-storage.md): 18 questions, Mid-Level
- [Testing & PHPUnit](https://sharpskill.dev/en/technologies/laravel/interview-questions/testing-phpunit.md): 24 questions, Mid-Level
- [Caching](https://sharpskill.dev/en/technologies/laravel/interview-questions/caching.md): 18 questions, Mid-Level
- [Livewire & Inertia](https://sharpskill.dev/en/technologies/laravel/interview-questions/livewire-inertia.md): 20 questions, Mid-Level
- [Eloquent Advanced](https://sharpskill.dev/en/technologies/laravel/interview-questions/eloquent-advanced.md): 24 questions, Senior
- [Repository Pattern](https://sharpskill.dev/en/technologies/laravel/interview-questions/repository-pattern.md): 20 questions, Senior
- [Laravel Packages](https://sharpskill.dev/en/technologies/laravel/interview-questions/laravel-packages.md): 20 questions, Senior
- [Performance Optimization](https://sharpskill.dev/en/technologies/laravel/interview-questions/performance-optimization.md): 22 questions, Senior
- [Security Best Practices](https://sharpskill.dev/en/technologies/laravel/interview-questions/security-best-practices.md): 22 questions, Senior
- [Laravel Octane](https://sharpskill.dev/en/technologies/laravel/interview-questions/laravel-octane.md): 18 questions, Senior
- [Laravel Distributed Systems](https://sharpskill.dev/en/technologies/laravel/interview-questions/laravel-distributed-systems.md): 22 questions, Senior
- [Observability & Monitoring](https://sharpskill.dev/en/technologies/laravel/interview-questions/observability-monitoring.md): 20 questions, Senior
- [Deployment & DevOps](https://sharpskill.dev/en/technologies/laravel/interview-questions/deployment-devops.md): 20 questions, Senior

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