PHP Interview: 200 Questions and Answers

The book "PHP Interview: 200 Questions and Answers" is a practical guide for developers preparing for a technical interview. The author has collected and structured the most common questions asked at interviews in Russian and international IT companies, from Junior to Senior level.

What is this book about?

The publication covers all key topics necessary for successfully passing an interview:

• PHP Basics: data types, operators, control structures, working with arrays and strings.
• Object-Oriented Programming (OOP): classes, inheritance, polymorphism, interfaces, traits, magic methods.
• Working with Databases: SQL queries, PDO, MySQL, indexes, JOIN, transactions, optimization.
• Security: SQL injection, XSS, CSRF, data protection, validation.
• Frameworks and Architecture: Laravel, Symfony, Yii2, MVC, Dependency Injection, Service Container.
• Modern Practices: Composer, PSR standards, testing (PHPUnit), working with REST API, queues, caching (Redis, Memcached).
• Algorithms and Data Structures: basic logic and optimization tasks that are often encountered in interviews.

Who is this book for?

• Junior developers — to systematize knowledge and confidently answer basic questions.
• Middle developers — to deepen understanding of architecture, security, and frameworks.
• Senior developers — for reviewing key concepts and preparing for system design questions.
• Team leads and tech leads — as a reference for creating their own questions or evaluating candidates.

What will the reader learn?

After studying the book, you will be able to:

• Confidently answer 90% of typical PHP questions.
• Understand how popular frameworks work "under the hood."
• Competently explain the difference between an abstract class and an interface, a trait and inheritance.
• Write secure code and avoid vulnerabilities.
• Optimize SQL queries and understand the principles of how indexes work.
• Design REST API and work with modern tools (Composer, PHPUnit, Redis).

Each question is accompanied by a detailed answer with code examples, and at the end of the sections, recommendations for in-depth study of the topics are given. The book is written in simple and clear language, without unnecessary "fluff" — only what will actually be useful in an interview.

"PHP Interview: 200 Questions and Answers" is your personal simulator for interview preparation. With it, you will feel confident, even if the interview is scheduled for tomorrow.