PHP Server-Side Development Quiz

1. What is the primary function of PHP in server-side development?

• PHP processes user requests on the server and sends the results back to the browser as HTML.
• PHP converts HTML documents into XML format for browsers.
• PHP handles client-side scripting tasks and events.
• PHP creates static web pages and stores them on the server.

2. Which web servers are able to run PHP scripts?

• Nginx
• Google Chrome
• Apache
• Firefox

3. How many functions does PHP include for Perl-compatible regular expressions?

• 12 functions
• 6 functions
• 10 functions
• 8 functions

4. What is the default session name used in PHP?

• PHPSESSID
• PHPSESSION
• DEFAULT_SESSION
• SESSION_NAME

5. How can you start a session in PHP?

• session_start()
• initiate_session()
• start_session()
• begin_session()

6. What distinguishes require() from include() in PHP?

• include() always returns a boolean
• require() stops execution on error
• include() aborts the script on failure
• require() does not include files

7. In PHP, how do you define a constant?

• create_constant(`CONSTANT_NAME`, value);
• define(`CONSTANT_NAME`, value);
• constant_define(`CONSTANT_NAME`, value);
• set_constant(`CONSTANT_NAME`, value);

8. What types of arrays can be created in PHP?

• String arrays, object arrays, and class arrays.
• Dynamic arrays, static arrays, and linked arrays.
• Indexed arrays, associative arrays, and multidimensional arrays.
• Multiscope arrays, constant arrays, and tuple arrays.

9. What is the difference between arrays and lists in PHP?

• An array is limited to 10 elements, while a list can hold more.
• An array is a data structure that holds ordered elements, while a list is just a numeric array.
• An array stores mixed data types, but a list only holds integers.
• An array always holds unique values, while a list can have duplicates.

10. How do unset() and unlink() differ in PHP?

• `unset()` defines a function, while `unlink()` initiates a session.
• `unset()` stops a script, while `unlink()` checks permissions.
• `unset()` clears the cache, while `unlink()` uploads a file.
• `unset()` removes a variable, while `unlink()` deletes a file.

11. What function is used to create a cookie in PHP?

• makecookie()
• newcookie()
• setcookie()
• createcookie()

12. How does a generator function work in PHP?

• A generator allows for efficient iteration over values using `yield`.
• A generator only returns a single value when called.
• A generator creates a new variable for each function call.
• A generator stores all values in an array for iteration.

13. What is the correct syntax for a foreach loop in PHP?

• foreach ($array as $value) { // code }
• foreach ($value as $array) { // code }
• for each ($array as $value) { // code }
• foreach ($array; $value) { // code }

14. What are the core variable types in PHP?

• Strings, objects, arrays, functions
• Booleans, dictionaries, variables, classes
• Characters, lists, maps, integers
• Integers, floats, strings, booleans

15. How do classes and objects differ in PHP?

• A class is a subroutine, while an object is an executable statement.
• A class defines variables, while an object defines functions.
• A class is a blueprint for objects, while an object is an instance of a class.
• A class is a type of variable, while an object is a function.

16. What is the syntax to declare an array in PHP?

• array(value1, value2);
• array = new Array();
• $array = array();
• $array[] = value;

17. What is the role of PDO in PHP development?

• PDO is used for file uploads in PHP applications.
• PDO provides a data access abstraction layer for different databases.
• PDO operates as a caching mechanism for PHP scripts.
• PDO is a template engine for rendering HTML in PHP.

18. How can you connect to a database using PHP?

• You connect to a database using database_link() method.
• You connect to a database using db_connect() only.
• You connect to a database using connect_db() function.
• You connect to a database using mysqli_connect() or PDO::connect().

19. What does the session_destroy() function accomplish in PHP?

• The `session_destroy()` function destroys all data registered to a session.
• The `session_destroy()` function saves session data to the database.
• The `session_destroy()` function creates a new session.
• The `session_destroy()` function initializes a session.

20. What methods can be used for validating form data in PHP?

• You validate form data in PHP by checking for empty fields.
• You validate form data in PHP by doubling the input values.
• You validate form data in PHP by ignoring empty fields.
• You validate form data in PHP by storing it as-is.

21. How do echo and print differ in PHP’s output?

• `echo` is used for debugging, while `print` is for user input.
• `echo` does not return a value, while `print` returns 1.
• `echo` can handle arrays, while `print` cannot.
• `echo` only outputs strings, while `print` outputs numbers.

22. What is the purpose of the preg_match() function in PHP?

• The `preg_match()` function searches for a pattern in a string and returns the number of matches.
• The `preg_match()` function creates a new string based on a pattern.
• The `preg_match()` function formats a string into a specific pattern.
• The `preg_match()` function deletes a pattern from a string.

23. How are regular expressions utilized in PHP?

• You cannot use regular expressions within PHP at all.
• You require a special library to handle regex in PHP.
• You use array functions to manipulate regex patterns.
• You use functions like `preg_match()` and `preg_replace()` for regex.

24. What does the array_key_exists() function do in PHP?

• The `array_key_exists()` function sorts the keys of an array.
• The `array_key_exists()` function checks whether a key exists in an array.
• The `array_key_exists()` function merges two arrays together.
• The `array_key_exists()` function removes a key from an array.

25. How can an array be sorted in PHP?

• You can sort an array using `sort()`.
• Invoke the `array_count()` function.
• Use the `array_keys()` function.
• Sort with `array_merge()`.

26. What is the purpose of the unset() function?

• The `unset()` function starts a new PHP session.
• The `unset()` function removes a variable from the scope.
• The `unset()` function deletes a file from the system.
• The `unset()` function initializes an array.

27. What techniques are available for error handling in PHP?

• You handle errors in PHP using functions like `error_reporting()` and `set_error_handler()`.
• You handle errors in PHP using the `http_response_code()` function.
• You handle errors in PHP with `array_push()` and `in_array()`.
• You handle errors in PHP by using HTML and CSS for styling.

28. How does session_start() function in PHP work?

• It starts a new session or resumes an existing one.
• It deletes session data and stops the script.
• It initializes PHP variables used for sessions.
• It encrypts the session data for security.

29. What is the method for creating a multidimensional array in PHP?

• You create a multidimensional array by using the json_encode() function.
• You create a multidimensional array with single-dimensional arrays.
• You create a multidimensional array by nesting arrays within each other.
• You create a multidimensional array using the array_fill() function.

30. What does array_push() do in PHP?

• The `array_push()` function sorts the elements in an array.
• The `array_push()` function adds elements to an array`s end.
• The `array_push()` function checks for duplicates in an array.
• The `array_push()` function removes elements from an array.