php-interview-ultimate

This repository contains all the questions and the answers for this topics:

• 100 Must-Know PHP Interview Questions in 2026
• PHP Interview Questions (all level)
• Interview questions and answers

PHP Interview Questions - Ultimate Answer Repository

This repository is a curated collection of PHP interview questions and answers, gathered from various high-quality sources. It aims to be the ultimate resource for developers preparing for PHP-related interviews.

🚀 Ready to get started? Visit the Documentation Website

• A non-commercial website with a collection of PHP interview questions and answers from this repository.
• Open-source and free to use.

Modern Frontend

Check out the new Modular Interview Questions Documentation!

• Modularized: Each question is an independent module.
• Categorized: Junior, Middle, Senior, and Expert levels.
• Themed: Beautiful, readable UI with Tailwind CSS.
• Searchable: Easy navigation through topics.

Table of Contents

• About
• Source Repositories
• Source Projects and Learning Web Sites
• Project Structure
• Key Topics Covered

About

This project consolidates different repositories into one place, making it easier to search and study various interview questions. It includes answers for both core PHP and popular frameworks like Laravel and Symfony, as well as related technologies such as MySQL, Redis, Docker, and more.

Source Repositories

The content in this repository is sourced from the following GitHub projects:

• glaphire/interview_questions_and_answers
• Sabbir-Hossain12/PHP-LARAVEL-Interview-questions
• Devinterview-io/php-interview-questions
• zsoro2/php-interview-questions
• doocs/leetcode - LeetCode solutions in various languages.

Source Projects and Learning Web Sites

The content that was used to learn Design Patterns, Refactoring principles:

• Refactoring Guru
• Backend Roadmap
• HaPHPiness
• RexEgg
• Metanit
• Partially written and organized using Gemini, Cursor, and JetBrains AI.

Project Structure

The repository is organized into subdirectories under src/, each representing a source repository:

• src/interview_questions_and_answers/: Detailed questions and answers covering a wide range of topics from core PHP to architecture.
• src/PHP-LARAVEL-Interview-questions/: PHP and Laravel specific questions by Sabbir Hossain.
• src/php-interview-questions/: A collection of questions from Devinterview.io.
• src/zsoro-php-interview-questions/: PHP interview questions by zsoro.

Development

Frontend Development (Docusaurus)

To run the frontend locally from the root:

1. npm run install:docs
2. npm run dev

Alternatively, from the docs directory:

1. cd docs
2. npm install
3. npm start or npm run dev

To lint and format the codebase: From the root: npm run lint or npm run format From the docs directory: npm run lint or npm run format

Docker

Alternatively, you can build and run the frontend using Docker:

docker compose up --build

The documentation will be available at http://localhost:8888 (served via Nginx) or http://localhost:3333 (served via Node).

To run the frontend in development mode with hot-reloading:

docker compose run --service-ports node npm run dev

The documentation will be available at http://localhost:3333.

Key Topics Covered

• The documentation is now organized into 29 major categories, including:
• Core PHP: Data types, generators, magic constants, PHP features (8.0+), and more.
• Kafka: High-performance distributed streaming, EOS, and PHP implementation.
• Regexp: Comprehensive guide to regular expressions in PHP, including PCRE functions and common tasks.
• HaPHPiness: Modern PHP features and best things in PHP.
• LeetCode Solutions: Solutions to LeetCode challenges in PHP.
• Frameworks: Laravel, Symfony, and Doctrine.
• Design Patterns & OOP: SOLID principles, common design patterns, and OOP fundamentals.
• Databases: MySQL, PostgreSQL, Redis, Memcached, and ElasticSearch.
• PostgreSQL: Advanced features, JSONB, and differences from MySQL.
• Architecture: Microservices, highload, and system design.
• DevOps & Tools: Docker, Git, and deployment strategies.
• Testing: Unit, functional, and integration testing.
• Clean Code: Robert C. Martin’s Clean Code principles.
• Algorithms: Basic and sorting algorithms in PHP.
• SQL Literacy: Advanced concurrency, locking strategies, and idempotency.

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