PHP Interview Questions (Beginner Level) – Short Answers

 

🔹 PHP Interview Questions (Beginner Level) – Short Answers

  1. What is PHP?
    → PHP is a server-side scripting language used to create dynamic websites.

  2. When and why is it used?
    → Used for web development to handle forms, sessions, databases, and more.

  3. What are the main features of PHP?
    → Open-source, server-side, platform-independent, supports databases.

  4. Difference between echo and print?
    → echo is faster and can print multiple values; print returns 1 (used in expressions).

  5. How do you declare variables in PHP?
    → With $ symbol. Example: $name = "John";

  6. What are data types in PHP?
    → String, Integer, Float, Boolean, Array, Object, NULL.

  7. Difference between == and ===?
    → == compares values, === compares value + data type.

  8. What are superglobals?
    → Built-in global variables like $_GET, $_POST, $_SESSION, etc.

  9. How does PHP handle forms (GET vs POST)?
    → $_GET shows data in URL; $_POST hides data. POST is safer for sensitive data.

  10. Difference between include and require?
    → Both include files. require stops script on error, include gives warning.

  11. What is the use of isset() and empty()?
    → isset() checks if variable is set. empty() checks if it's empty.

  12. Difference between single (') and double (") quotes?
    → 'text' prints as-is. "text $var" allows variable parsing.

  13. How to define a constant?
    → define("SITE_NAME", "MyWebsite");

  14. Different types of arrays?
    → Indexed, Associative, and Multidimensional.

  15. Indexed vs Associative arrays?
    → Indexed uses numbers ($arr[0]), associative uses keys ($arr["name"]).

  16. How to loop through an array?
    → Use foreach($arr as $item) or for loop.

  17. Types of loops in PHP?
    → for, while, do...while, foreach.

  18. How to define a function in PHP?
    → function sayHello() { echo "Hello"; }

  19. How to handle errors in PHP?
    → Use error_reporting(), try-catch, die(), or set_error_handler().

  20. How to start a session in PHP?
    → session_start();

  21. Difference between cookies and sessions?
    → Cookies are stored in browser; sessions are stored on server (more secure).

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