Web Development or PHP Developer Interview Best Questions 2025

Web Development or PHP Developer Interview Best Questions 2025, best practice of php developers questions for cracking interview in different companies.

🧠 General Web Development Interview Questions

1. What is the difference between client-side and server-side scripting?
   • Client-side: Runs in browser (HTML, CSS, JS).
   • Server-side: Runs on server (PHP, Node.js, Python, etc.)
2. What is REST API?
   • REST (Representational State Transfer) — API design principle using HTTP methods (GET, POST, PUT, DELETE).

1. What are HTTP methods and status codes?
   • Methods: GET, POST, PUT, PATCH, DELETE
   • Codes: 200 (OK), 404 (Not Found), 500 (Server Error)
2. What is responsive web design?
   • Making web pages adjust to different screen sizes (mobile, tablet, desktop) using CSS media queries, Flexbox, Grid, etc.
3. Explain the difference between cookies, session, and local storage.

🎨 Front-End Developer Interview Questions

1. Explain the difference between == and === in JavaScript.
   • == checks only value (type conversion allowed)
   • === checks value and type (strict equality)
2. What is DOM?
   • Document Object Model — represents HTML elements as objects that can be manipulated using JS.
3. Explain the concept of event bubbling and event capturing.
4. What are CSS selectors and specificity?
   • Determines which CSS rule applies when multiple rules match the same element.
5. Difference between inline, inline-block, and block elements?
6. What are promises and async/await in JavaScript?
7. Explain how React or Vue works (if you mention JS frameworks).

🐘 PHP Developer Interview Questions

1. What is PHP and why is it used?
   • PHP is a server-side scripting language used for dynamic web applications.
2. Explain the difference between include() and require().
   • require() stops script on failure, include() just gives a warning.
3. What are superglobals in PHP?
   • $_GET, $_POST, $_SESSION, $_COOKIE, $_SERVER, etc.
4. What is the difference between GET and POST methods?
5. Explain sessions and cookies in PHP.
6. How do you connect PHP with MySQL?
   • Using mysqli or PDO extensions.
7. What is prepared statement in PHP? Why is it important?
   • Protects against SQL injection.
8. What is the difference between echo and print?
9. How do you handle file uploads in PHP?
10. What are traits in PHP?

💾 Database & Backend Questions (For PHP/Web Developers)

1. What is normalization in databases?
2. Difference between INNER JOIN, LEFT JOIN, and RIGHT JOIN.
3. How do you prevent SQL injection?
4. What is indexing in databases and why is it used?

⚙️ Practical / Scenario-Based Questions

1. Create a login system using PHP and MySQL.
2. How will you make a form validation both client-side and server-side?
3. How will you improve website performance?
4. Explain MVC architecture in web development.