prepare for PHP developer interview

How to prepare for PHP developer interview?

PHP developers have become increasingly critical in the digital age. PHP developers remain high due to PHP’s popularity as one of the most popular programming languages. Competition in the job market is also high, and interview preparation can make all the difference. Our goal in this article is to help you prepare for a PHP developer interview, so you have the best chance of success.

Understand the basics

First, you must thoroughly understand the basics of PHP. This includes understanding syntax, data types, operators, loops, conditionals, and functions. Also, familiarity with PHP’s OOP (Object-Oriented Programming) concepts is essential.

Learning database management

PHP developers often work with databases. Therefore, knowledge of MySQL or another database management system, such as PostgreSQL or MongoDB, is essential. You should learn to create tables, write queries, and optimize databases.

Using frameworks

Interviewers may prefer candidates familiar with PHP frameworks such as Laravel, Symfony, or CodeIgniter. A framework simplifies developing and maintaining applications. Understanding MVC (Model-View-Controller) concepts and how to use these frameworks when building modern web applications is essential.

Mastery of dependency management

Dependency management tools like Composer are essential in PHP. These tools help you manage libraries and packages. Knowing how to use Composer and understanding dependency management basics is critical for any PHP developer and offshore PHP developer.

Personal projects and open-source participation

The experience you gain working on personal projects or contributing to open-source projects will increase your knowledge and demonstrate your commitment to learning and progressing in web development. Highlight these experiences on your resume.

Soft skills and interviewing

In addition to technical skills, communicating effectively and working in a team are crucial in job interviews. Practicing interviewing skills, including answering behavioral and technical questions, will help you feel more confident heading into the interview.

Preparing for a PHP developer interview requires focusing on technical skills, completing practical projects, and developing communication skills. By following this guide, you can prepare well to succeed in future interviews and become a skilled PHP developer.

prepare for PHP developer interview

Prepare for PHP developer interview questions

PHP developers are essential for building and developing websites and web applications. Preparing for job interviews requires knowing what to expect and practicing practical answers. The following will help you prepare for PHP programming interview questions and PHP coding test questions and answers.

Understanding PHP basics

  • Explain what PHP is and why it is used for web development.

PHP is a server-side programming language widely used for developing websites and web applications. It is flexible, easy to use, and can interact with databases.

  • What is OOP in PHP?

Object-oriented programming (OOP) is a programming paradigm structured around “classes” and “objects.” In PHP, OOP helps developers make code more manageable and modular.

  • How do variables and constants differ in PHP?

The critical differences between variables and constants include:

  1. In PHP, it is possible to change the value of a variable during execution, but it is not possible to change the constant value during script execution.
  2. A $ sign must precede variables, while constants are not preceded by a dollar sign ($).
  3. A simple assignment is needed to define a variable. However, simple assignments cannot define constants, and the define() function must be used to specify them.
  4. In variables, the default scope is the current access scope if it is possible to access constants globally and without restrictions.

Common technical questions

  • What is the difference between === and = in PHP?

It compares value equality regardless of data type, while = checks both value and data type equality.

  • How can SQL injection attacks in PHP be prevented?

If you intend to insert dangerous data into the database, prepare statements and binding parameters with PDO or MySQLi to prevent this from happening.

  • What variables are in PHP?

Eight main data types in PHP are used to create variables. Below are the types of variables available in PHP:

  1. Type of Integer: Integers are whole numbers without floating points. For example, 1253 is an integer.
  2. Doubles: This variable type is the same as floating point numbers; for example, 7.876 is considered a double.
  3. Boolean data type: Boolean represents two logical states. For example, true and false are two Boolean values.
  4. NULL type: The NULL data type holds only one value. When no value is assigned to a variable, NULL can be assigned.
  5. Array type: Arrays are named and ordered collections of the same data type. For example, the following command-line expression is an array.
  6. String type: Strings are sequences of characters. For example, “Hello! InterviewBit” is a string.
  7. Resource type: Resources are unique variables referencing external PHP resources (such as database connections).
  8. Object data type: This is an example of classes containing data and functions. For example, mango = The New Fruit();$ is an object.

Advanced questions

  • Explain how the namespace works in PHP and why it is crucial.

Namespaces help divide code into different namespaces to avoid conflicting names and classes, especially in large applications and when using third-party libraries.

  • How do you create a RESTful API with PHP?

Creating a RESTful API with PHP involves defining endpoints, receiving HTTP requests (GET, POST, PUT, DELETE), and returning data in JSON or XML format.

  • What are the steps to create a new database using MySQL and PHP?

Four main steps are necessary to create a new MySQL database in PHP, which are listed below.

  1. PHP scripts are used to communicate with MySQL servers.
  2. When the connection is confirmed, a sample query can be written to verify if the connection is successful.
  3. Queries are considered inputs that create the database and will later be stored in a string variable.
  4. After the above steps, the created queries are executed one after another.

Preparation for practice questions

  • Practice small projects: Working on personal projects or contributing to open-source projects gives you hands-on experience.
  • Code Review: Reading and analyzing other people’s code will help you better understand different programming practices and possible solutions.


Preparing for PHP programming interviews requires continuous study and practice. Focusing on the questions and improving your interview skills will help you interview confidently. Your success in an interview depends on your technical knowledge and how you present your skills and experience.

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