30+ Php Full Stack Developer Interview Questions and Answers

In such cases, it is important to analyze the issue thoroughly on the production server and implement a fix cautiously.

• First, analyze the logs and error messages on the production server to understand the root cause of the issue.

• Check for any recent changes or updates that might have caused the problem.

• If possible, try to replicate the issue in a controlled environment like staging or local to further investigate.

• Consult with team members or experts to brainstorm possible sol...read more

Laravel uses a unique session identifier to find a specific session for each user.

• Laravel generates a unique session ID for each user upon login

• The session ID is stored in a cookie on the user's browser

• Laravel uses the session ID to retrieve the user's session data from the server

To write a custom authentication & middleware in Laravel, you can create a custom guard and middleware classes.

• Create a custom guard by extending the 'Illuminate\Auth\Guard' class and implementing the necessary methods like 'validate' and 'user'.

• Register the custom guard in the 'auth.php' configuration file.

• Create a custom middleware by extending the 'Illuminate\Auth\Middleware\Authenticate' class and implementing the 'handle' method.

• Register the custom middleware in the 'app...read more

Use Laravel's Eloquent ORM with chunking and eager loading for optimized fetching of 5 million records from 3 tables in a single DB.

• Use Laravel's Eloquent ORM to fetch records efficiently

• Use chunking to process large datasets in smaller, manageable chunks

• Utilize eager loading to reduce the number of queries executed

To send asynchronous notifications in Laravel, use queues to handle background processing.

• Use Laravel's built-in queue system to send notifications asynchronously.

• Define a notification class and use the ShouldQueue interface to indicate that the notification should be sent asynchronously.

• Dispatch the notification using the queue driver of your choice (e.g. database, Redis, Amazon SQS).

Indexing in DB tables improves query performance by allowing the database to quickly locate specific rows.

• Indexes help in speeding up data retrieval operations by providing quick access to rows based on the indexed columns.

• They reduce the number of disk I/O operations required to fetch data, resulting in faster query execution.

• Indexes can also enforce uniqueness constraints and improve the efficiency of joins between tables.

• Examples: Creating an index on a 'user_id' column in...read more

The 'Key' directive in Vue is used to uniquely identify elements in a list to improve performance and prevent re-rendering.

• Helps Vue efficiently update the DOM by reusing existing elements instead of creating new ones

• Prevents unnecessary re-rendering of elements in a list when their order changes

• Improves performance by allowing Vue to track and update specific elements based on their keys

• Example:

  {{ item.name }}

The composer.lock file is used to lock the exact versions of dependencies in a project to ensure consistent builds.

• Prevents different versions of dependencies from being installed on different machines

• Ensures that all developers are using the same versions of dependencies

• Helps in maintaining consistency and stability of the project

Sessions store data on the server side, while cookies store data on the client side.

• Sessions store data on the server side, while cookies store data on the client side.

• Sessions are more secure as the data is stored on the server and not accessible by the client.

• Cookies are limited in size (4KB) and can be disabled by the client, while sessions have no such limitations.

Laravel Notifications allow you to send notifications across multiple channels. Different types of mailers in Laravel include SMTP, Mailgun, and Sendmail.

• Laravel Notifications can be sent through email, SMS, Slack, and more

• SMTP mailer is commonly used for sending emails in Laravel

• Mailgun is a popular mailer service that can be integrated with Laravel for sending emails

• Sendmail is another option for sending emails in Laravel

To write a unit test in Laravel #8, use PHPUnit and create test classes that extend the TestCase class.

• Create a new test class in the 'tests' directory.

• Extend the class with PHPUnit's TestCase class.

• Write test methods within the class to test specific functionality.

• Use assertions provided by PHPUnit to check if the code behaves as expected.

• Run the tests using the 'php artisan test' command.

Using 'Scope' in style allows us to apply styles to specific elements within a component.

• Scope in style allows us to target specific elements within a component without affecting others

• It helps in organizing and managing styles more efficiently

• Scope can be used to prevent styles from leaking out of a component

Polymorphism in Laravel relationships allows a model to belong to multiple other models.

• Polymorphic relationships allow a model to belong to multiple other models.

• It is useful when a model can belong to more than one other model.

• For example, a Comment model can belong to either a Post or a Video model.

Vue 3 is the latest version of Vue.js with improved performance, new features, and better TypeScript support.

• Vue 3 uses a new reactivity system called the Composition API, which offers more flexibility and better organization of code compared to Vue 2's Options API.

• Vue 3 introduces a new compiler that generates optimized code for better performance.

• Vue 3 provides better TypeScript support with improved type inference and better integration with TypeScript.

• Vue 3 has a smaller ...read more

Options API is more verbose and flexible, while Composition API is more organized and reusable.

• Options API allows defining component options in separate sections like data, methods, computed, etc.

• Composition API allows organizing code based on logic and reusability with setup() function.

• Options API is suitable for smaller projects or when starting with Vue, while Composition API is recommended for larger projects or complex logic.

• Composition API promotes better code organizat...read more

To upgrade Laravel, you need to follow the official documentation and use Composer to update dependencies.

• Check the Laravel documentation for the specific version you are upgrading to

• Update your composer.json file with the new Laravel version

• Run 'composer update' command in your terminal to update dependencies

• Check for any deprecated features or changes in the new version and make necessary adjustments

The 'env' function in Vue is used to access environment variables in your application.

• Use process.env to access environment variables in Vue components

• Environment variables can be set in a .env file at the root of your project

• Remember to restart your development server after adding or changing environment variables

Yes, I have backend and database knowledge.

• I have experience in developing backend applications using PHP.

• I am proficient in working with databases like MySQL, PostgreSQL, and MongoDB.

• I have knowledge of RESTful APIs and integrating them with frontend applications.

Full stack developers have a wide range of skills and can work on both front-end and back-end development, making them versatile and in high demand.

• Full stack developers can work on all aspects of a project, from database design to user interface.

• They can easily switch between front-end and back-end tasks, making them valuable team members.

• Having knowledge of multiple technologies allows full stack developers to troubleshoot and solve problems more efficiently.

• Employers value...read more

CSS - Cascading Style Sheets, HTML - HyperText Markup Language, SQL - Structured Query Language

• CSS stands for Cascading Style Sheets and is used for styling web pages

• HTML stands for HyperText Markup Language and is used for creating the structure of web pages

• SQL stands for Structured Query Language and is used for managing and manipulating databases

A class is a blueprint for creating objects in object-oriented programming. An object is an instance of a class.

• A class defines the properties and behaviors of objects.

• An object is a specific instance of a class.

• Objects can interact with each other through methods defined in their classes.

• Example: Class 'Car' defines properties like 'color' and behaviors like 'drive'. An object 'myCar' can be created from this class.

• Example: Class 'Person' defines properties like 'name' and b...read more

Selectors in CSS are patterns used to select the elements you want to style on a webpage.

• Selectors can target elements based on their tag name, class, ID, attributes, and more

• Examples include: 'h1' for selecting all h1 elements, '.classname' for selecting elements with a specific class, '#idname' for selecting elements with a specific ID

Laravel is a PHP framework known for its elegant syntax and powerful features.

• MVC architecture for organizing code

• Built-in authentication and authorization

• Eloquent ORM for database management

• Blade templating engine for easy views

• Artisan command-line tool for automating tasks

To create a database, you need to first choose a database management system, create a new database within the system, and then define the tables and relationships within the database.

• Choose a database management system (e.g. MySQL, PostgreSQL, MongoDB)

• Create a new database within the chosen system (e.g. CREATE DATABASE dbname)

• Define tables and relationships within the database (e.g. CREATE TABLE tablename)

DRY (Don't Repeat Yourself) Principles aim to reduce repetition of code by promoting code reusability and maintainability.

• Avoid duplicating code by extracting common functionality into reusable functions or classes

• Follow the Single Responsibility Principle to ensure each piece of code has only one responsibility

• Use inheritance and composition to share code among different parts of the application

• DRY code is easier to maintain, debug, and update

• Example: Instead of writing the ...read more

A database is a structured collection of data that is stored and accessed electronically.

• A database organizes data into tables, rows, and columns.

• It allows for efficient storage, retrieval, and manipulation of data.

• Examples of databases include MySQL, PostgreSQL, and MongoDB.

Object-oriented programming concepts like inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance allows a class to inherit properties and methods from another class.

• Encapsulation restricts access to certain components within a class.

• Polymorphism allows objects to be treated as instances of their parent class.

• Abstraction hides complex implementation details and only shows necessary features.

Magic functions in PHP are special methods that are automatically called in response to certain events.

• Magic functions start with two underscores (__) in PHP.

• Examples of magic functions include __construct(), __destruct(), __get(), __set(), __call(), etc.

• These functions are used to perform specific actions when certain events occur in a class.