Senior Php Developer Interview Questions
Senior PHP Developer: Common Interview Questions
Senior Php Developer Interview Questions
Senior PHP Developer interview questions are designed to assess the knowledge, experience, and problem-solving skills of a candidate for a senior role in PHP development. They cover topics such as PHP coding, web development concepts, architecture, database design, and software development best practices. These questions also aim to evaluate the candidate's ability to handle complex projects, work in a team, and lead junior developers. The interviewer may also ask about the candidate's experience with managing and troubleshooting production systems and their understanding of current industry trends and technologies. Overall, these questions help determine if the candidate has the necessary skills and expertise to excel in a senior PHP development role.
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1 - What are some of the features of PHP 7?
Answer: PHP 7 includes features like type declarations, return type declarations, anonymous classes, null coalescing operator, spaceship operator, scalar type declarations, and several performance improvements.
2) How do you handle errors in PHP?
Answer: Errors in PHP can be handled by using the try catch block or the built in error handling functions like error_reporting() and set_error_handler().
3) Can you explain the differences between GET and POST methods in PHP?
Answer: GET method is used to send form data in the URL while POST method sends the form data in a hidden manner. GET method is less secure than POST as the data is visible in the URL. GET method has length limitations, while POST has no such limitations.
4) What is a session in PHP?
Answer: A session in PHP is a way to store user information on the server for later use. It helps to maintain user specific data throughout multiple requests.
5) What is the difference between cookie and session in PHP?
Answer: Cookies are stored on the user's computer while sessions are stored on the server. Cookies have size limitations, while sessions can hold larger amounts of data. Cookies can be manipulated by the client, while sessions cannot.
6) Explain how you would secure a PHP application.
Answer: Some of the ways to secure a PHP application are by using input validation, sanitizing user inputs, using HTTPS, implementing proper access controls, escaping database queries, and regularly updating software.
7) Can you explain the difference between require and include in PHP?
Answer: ‘Include’ and ‘require’ both include a file in a PHP script. The main difference is that ‘require’ will produce a fatal error if the file is not found, whereas ‘include’ will only produce a warning.
8) What is PDO in PHP?
Answer: PDO (PHP Data Objects) is a PHP extension that provides a unified database access API for developers. It supports multiple database types and provides a safer and more secure way to connect to databases.
9) What is an autoloader in PHP?
Answer: An autoloader is a function that automatically loads the necessary class files when a class is instantiated, without the need for manual inclusion.
10) How do you debug PHP code?
Answer: PHP code can be debugged by using tools like Xdebug, built in functions like error_log() and debug_backtrace(), or by using a debugger IDE like PhpStorm or NetBeans.
11) What is a namespace in PHP?
Answer: A namespace in PHP is a way to organize code by creating a container for similar classes, functions, and variables. It helps to avoid naming collisions and makes code more maintainable.
12) How do you prevent SQL injection in PHP?
Answer: SQL injection can be prevented by using input validation, sanitizing user inputs, and using prepared statements or parameterized queries when interacting with a database.
13) What are some best practices for writing efficient PHP code?
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Answer: Some best practices for writing efficient PHP code are using proper variable naming conventions, avoiding global variables, using functions and classes to organize code, and minimizing database and file accesses.
14) What are some common security vulnerabilities in PHP?
Answer: Some common security vulnerabilities in PHP are cross site scripting (XSS), SQL injection, remote code execution, and insecure file uploads.
15) What is the use of the __construct() function in PHP?
Answer: The __construct() function is a special function in PHP that is automatically called when an object is created. It is used to initialize object properties and perform any other necessary setup tasks.
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