Question 1

What is PHP and what are its key features?

Accepted Answer

PHP is a server-side scripting language designed for web development. Features include ease of use, integration with databases, open source, and support for OOP.

Question 2

What is the difference between 'public', 'private', and 'protected' in PHP?

Accepted Answer

'Public' allows access from anywhere, 'private' only within the class, and 'protected' allows access within the class and its child classes.

Question 3

What is the difference between a session and a cookie in PHP?

Accepted Answer

A cookie stores data in the user's browser, while a session stores data on the server. Sessions are more secure for sensitive data.

Question 4

How do you connect PHP with MySQL?

Accepted Answer

Using `mysqli_connect()` or PDO. PDO is preferred for advanced features and security like prepared statements.

Question 5

How does PHP handle error reporting?

Accepted Answer

Using `error_reporting()`, `ini_set()`, and `try-catch` for exceptions. You can log or display errors based on environment.

Question 6

What are the different ways to define a variable in PHP?

Accepted Answer

Variables start with $ followed by name. They are dynamically typed. Constants are defined with define() or const.

Question 7

What is the difference between `echo` and `print`?

Accepted Answer

`echo` can take multiple parameters, returns void; `print` takes one parameter and returns 1. Both output strings.

Question 8

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

Accepted Answer

`==` compares value after type juggling; `===` compares both value and type.

Question 9

Explain the concept of interfaces in PHP.

Accepted Answer

Interfaces define method signatures without implementation. Classes can implement multiple interfaces. Useful for contract-based programming.

Question 10

What are traits in PHP?

Accepted Answer

Traits allow code reuse in single inheritance languages. They are groups of methods that can be included in classes to avoid duplication.

PHP Interview Questions & Answers

What is PHP and what are its key features?

What is the difference between 'public', 'private', and 'protected' in PHP?

What is the difference between a session and a cookie in PHP?

How do you connect PHP with MySQL?

How does PHP handle error reporting?

What are the different ways to define a variable in PHP?

What is the difference between `echo` and `print`?

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

Explain the concept of interfaces in PHP.

What are traits in PHP?

How do you destroy a session in PHP?

What are prepared statements and why are they used?

What is the difference between mysqli and PDO?

What is dependency injection in PHP?

Explain the concept of autoloading in PHP.

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