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PHP Viva Questions Answers

The document provides a comprehensive overview of PHP, covering its definition, key features, data types, and various functions. It explains concepts such as superglobals, sessions, cookies, and the differences between GET and POST methods. Additionally, it addresses error handling, object-oriented programming, and distinctions between server-side and client-side scripting.

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24 views2 pages

PHP Viva Questions Answers

The document provides a comprehensive overview of PHP, covering its definition, key features, data types, and various functions. It explains concepts such as superglobals, sessions, cookies, and the differences between GET and POST methods. Additionally, it addresses error handling, object-oriented programming, and distinctions between server-side and client-side scripting.

Uploaded by

mota bhai
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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PHP Theory Viva Questions & Answers

Q: What is PHP?

A: PHP (Hypertext Preprocessor) is a widely-used open-source server-side scripting language that

is especially suited for web development and can be embedded into HTML.

Q: What are the key features of PHP?

A: Open-source, platform-independent, integrates with HTML, supports databases, server-side

execution, loosely typed.

Q: What are the different data types in PHP?

A: String, Integer, Float, Boolean, Array, Object, NULL, Resource.

Q: What is the difference between echo and print in PHP?

A: echo can output one or more strings and is faster; print returns a value (1) and can be used in

expressions.

Q: What are superglobals in PHP?

A: Built-in variables like $_GET, $_POST, $_REQUEST, $_SESSION, $_COOKIE, $_SERVER,

$_FILES.

Q: What is the difference between GET and POST?

A: GET shows data in URL and is limited; POST hides data and is more secure.

Q: What is a session in PHP?

A: Used to store user data across multiple pages using $_SESSION.

Q: What is a cookie?

A: A small file stored on the clients system using setcookie().

Q: How do you connect to a MySQL database in PHP?

A: Using mysqli_connect("localhost", "username", "password", "database");

Q: What is the difference between include and require?


A: include gives a warning if file is missing, require gives a fatal error.

Q: What is an associative array?

A: Array with named keys like $student = ["name" => "Prakash", "marks" => 85];

Q: What are functions in PHP?

A: Reusable block of code declared using function keyword.

Q: What is object-oriented programming in PHP?

A: Supports classes, objects, inheritance, encapsulation, and polymorphism.

Q: How do you define constants in PHP?

A: Using define("CONST_NAME", "value");

Q: What is the difference between == and ===?

A: == compares value, === compares value and type.

Q: How do you handle errors in PHP?

A: Using error_reporting(), try...catch, set_error_handler().

Q: What is the use of isset() and empty()?

A: isset() checks if variable is set, empty() checks if it's empty.

Q: What is explode() in PHP?

A: Splits a string into an array using a delimiter.

Q: What is the use of require_once?

A: Includes a file only once, preventing redeclaration errors.

Q: What is the difference between server-side and client-side scripting?

A: Server-side runs on the server (PHP), client-side runs in browser (JavaScript).

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