30 PHP Quiz Questions and Answers

PHP (Hypertext Preprocessor) is a popular server-side scripting language primarily used for web development. It was created by Rasmus Lerdorf in 1994 and has since become one of the most widely used languages for building dynamic websites and web applications. PHP is open source and has a large and active community of developers contributing to its development and ecosystem.

Here are some key features and aspects of PHP:

Server-side scripting: PHP is executed on the server side, which means the code is processed on the web server before being sent to the client’s browser. This allows PHP to generate dynamic content and interact with databases, files, and other server resources.

Easy to learn and use: PHP has a syntax similar to C and other programming languages, making it relatively easy for beginners to grasp. It has a large number of built-in functions and libraries, which simplifies common tasks and reduces the need for writing complex code from scratch.

Web development: PHP is primarily used for web development, allowing developers to embed PHP code directly into HTML. This integration makes it easy to mix dynamic content generation with static HTML content.

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Database integration: PHP has extensive support for interacting with databases, especially the popular MySQL and MariaDB databases. It provides functions and extensions for connecting to databases, executing queries, and retrieving data, making it a suitable choice for building database-driven web applications.

PHP continues to evolve with regular updates and new features being introduced. The latest major version as of my knowledge cutoff date (September 2021) is PHP 8, which brought significant performance improvements, new features like named arguments and attributes, and enhancements to error handling and type safety.

In this article

Part 1: 30 PHP quiz questions & answers

1. What does PHP stand for?
a) Personal Hypertext Processor
b) Pretext Hypertext Parser
c) Hypertext Preprocessor (Answer)
d) Preprocessor Hyperlink Parser

2. Which of the following is NOT a PHP data type?
a) Integer
b) String
c) Boolean
d) Character (Answer)

3. Which operator is used to concatenate two strings in PHP?
a) &
b) |
c) ^
d) . (Answer)

4. What is the correct way to start a PHP block of code?
d) # Comment (Answer)

10. What is the default file extension for PHP files?
a) .php (Answer)
b) .html
c) .txt
d) .py

11. How do you include the contents of one PHP file into another?
a) include_once()
b) require()
c) include() (Answer)
d) All of the above

12. Which function is used to count the number of elements in an array?
a) count()
b) size()
c) length()
d) sizeof() (Answer)

13. What is the purpose of the PHP function `mysqli_connect()`?
a) To connect to a MySQL database (Answer)
b) To execute a MySQL query
c) To fetch data from a MySQL database
d) To close the connection to a MySQL database

14. Which PHP extension is commonly used to work with XML data?
a) xmlreader()
b) xmlparse()
c) xml()
d) SimpleXML (Answer)

15. How do you start a session in PHP?
a) start_session()
b) session_start() (Answer)
c) create_session()
d) init_session()

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16. What is the correct way to handle errors in PHP?
a) Using the try-catch block
b) Using the error_reporting() function
c) Using the set_error_handler() function
d) All of the above (Answer)

17. How do you redirect a user to a different URL in PHP?
a) header(“Location: new_url.php”) (Answer)
b) redirect(“new_url.php”)
c) goto(“new_url.php”)
d) relocate(“new_url.php”)

18. What does the PHP function `file_get_contents()` do?
a) Reads the content of a file into a string (Answer)
b) Creates a new file and writes content into it
c) Deletes a file from the server
d) Checks if a file exists

19. Which PHP framework is known for its elegant syntax and expressive database ORM?
a) Laravel (Answer)
b) CodeIgniter
c) Symfony
d) Zend Framework

20. What is the purpose of the PHP function `json_encode()`?
a) Converts a PHP array or object into a JSON string (Answer)
b) Decodes a JSON string into a PHP array or object
c) Encrypts data using JSON format
d) Deletes a JSON file from the server

21. Which of the following is used for sanitizing user input in PHP to prevent SQL injection?
a) addslashes()
b) htmlentities()
c) mysqli_real_escape_string() (Answer)
d) All of the above

22. How do you remove whitespace from the beginning and end of a string in PHP?
a) trim() (Answer)
b) ltrim()
c) rtrim()
d) strip()

23. What is the output of the following code?
$x = 10;
echo $x++;
echo ++$x;
a) 11 12
b) 10 12
c) 11 11
d) 10 11 (Answer)

24. How do you declare a function in PHP?
a) function myFunction()
b) def myFunction()
c) func myFunction()
d) function myFunction() (Answer)

25. Which of the following is used for sending emails in PHP?
a) mail() (Answer)
b) sendmail()
c) smtp_send()
d) email()

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26. What is the purpose of the PHP function `htmlspecialchars()`?
a) Converts special characters to HTML entities to prevent cross-site scripting (XSS) attacks (Answer)
b) Encodes a URL string
c) Converts HTML entities to special characters
d) Converts a string to lowercase

27. How do you retrieve the value of a cookie in PHP?
a) $_COOKIE[‘cookie_name’] (Answer)
b) $cookie[‘cookie_name’]
c) get_cookie(‘cookie_name’)
d) fetch_cookie(‘cookie_name’)

28. What is the output of the following code?
$a = 5;
$b = 10;
echo ($a > $b) ? “Greater” : “Smaller”;
a) Greater
b) Smaller (Answer)
c) Error: syntax issue
d) Error: variable not defined

29. Which PHP function is used to delete a file from the server?
a) delete_file()
b) remove_file()
c) unlink() (Answer)
d) erase_file()

30. What is the purpose of the PHP function `session_destroy()`?
a) To end the current session and remove session data (Answer)
b) To start a new session
c) To destroy all variables in the current session
d) To close the session without destroying session data

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