Quiz - PHP – rtLearn

Question 1 of 38

Which of the following is NOT a predefined super-global variable in PHP?

$_UPDATE
$_SERVER
$_POST
$_COOKIE

Question 2 of 38

What is the purpose of a constructor in PHP?

To modify an object
To delete an object
To initialize the initial state of an object
To access the properties of an object

Question 3 of 38

Which statement is used to include a file in your PHP script but issues a warning if the file is not found?

include_once
require
require_once
include

Question 4 of 38

Which function opens a file and returns a file pointer resource?

fclose()
fopen()
fread()
fwrite()

Question 5 of 38

How can you prevent an SQL injection attack in PHP?

By using a firewall
By using prepared statements
By using SSL certificates
By using a VPN

Question 6 of 38

What is the purpose of the Content Security Policy (CSP)?

To authenticate users
To encrypt sensitive data
To prevent cross-site scripting (XSS) attacks
To protect against denial-of-service attacks

Question 7 of 38

What is the purpose of the var_dump() function in PHP?

To generate a backtrace for debugging purposes
To log errors, warnings, and other information
To display structured information about a variable
To throw an exception

Question 8 of 38

Which of the following is a debugging and profiling tool for PHP?

Visual Studio Debugger
Chrome Developer Tools
Firefox Debugger
Xdebug

Question 9 of 38

What does the $_GET superglobal variable contain?

Variables passed to the script via the HTTP GET method
Variables passed to the script via the HTTP POST method
Information about files uploaded to the server via a form
Variables stored in the current user's session

Question 10 of 38

What is the purpose of the error_log() function in PHP?

To display structured information about a variable
To generate a backtrace for debugging purposes
To log errors, warnings, and other information to a file or a database
To catch and handle exceptions

Question 11 of 38

How do you access a superglobal variable in PHP?

Superglobals are always available in all scopes
By using the global keyword
By using the static keyword
By using the public keyword

Question 12 of 38

Which statement halts script execution if the file is not found?

include
require
include_once
require_once

Question 13 of 38

Which function can be used to read an entire file into a string?

fread()
fwrite()
file_get_contents()
fopen()

Question 14 of 38

What is the purpose of the debug_backtrace() function in PHP?

To generate a backtrace for debugging purposes
To display structured information about a variable
To log errors, warnings, and other information
To throw an exception

Question 15 of 38

In PHP, which function is used to create a new directory?

mkdir()
rmdir()
create_dir()
file_exists()

Question 16 of 38

What is the purpose of the mysqli_real_escape_string() function in PHP?

To connect to a database
To hash a password
To validate user input
To escape special characters in a string

Question 17 of 38

What is the primary difference between the include and require statements in PHP?

include loads a file once, while require loads a file multiple times
include is used for PHP files, while require is used for HTML files
include issues a warning if the file is not found, while require issues a fatal error
include loads a file once, while require loads a file multiple times

Question 18 of 38

What is the purpose of the mysqli_connect() function in PHP?

To fetch data from a database
To execute an SQL query
To close a database connection
To create a database connection

Question 19 of 38

Which function is used to handle exceptions in PHP?

error_log()
try-catch
debug_backtrace()
var_dump()

Question 20 of 38

What is the purpose of the $_SESSION superglobal variable in PHP?

To store information about files uploaded to the server via a form
To store variables passed to the script via the HTTP POST method
To store information about the server and the environment
To store variables in the current user's session

Question 21 of 38

What is the main purpose of salting a password before hashing it?

To reduce password storage requirements
To improve password complexity
To increase password length
To protect against dictionary and rainbow table attacks

Question 22 of 38

Which of the following is NOT a visibility keyword for class properties and methods in PHP?

public
private
static
protected

Question 23 of 38

What is the primary purpose of using parameterized queries in PHP?

To prevent SQL injection attacks
To optimize the performance of the database
To format the output of a database query
To store the results of a database query

Question 24 of 38

What is the purpose of the htmlentities() function in PHP?

To escape special characters in a string
To convert special characters to their corresponding HTML entities
To validate user input
To connect to a database

Question 25 of 38

What is the main purpose of an abstract class in PHP? Select all that apply.

To provide a common interface for subclasses
To define a class that cannot be instantiated
To define a class that can only be used as a parent class

Question 26 of 38

What is the main difference between the fopen() and file_get_contents() functions in PHP?

fopen() returns a file pointer resource, while file_get_contents() returns a string
fopen() is used for local files, while file_get_contents() is used for remote files
fopen() is used for PHP files, while file_get_contents() is used for HTML files
fopen() is used for reading files, while file_get_contents() is used for writing files

Question 27 of 38

In PHP, which function is used to remove a directory?

file_exists()
remove_dir()
mkdir()
rmdir()

Question 28 of 38

What is the main purpose of the instanceof operator in PHP?

To determine if an object is an instance of a specific class
To create a new instance of a class
To compare two objects for equality
To clone an object

Question 29 of 38

Which PHP function is used to catch exceptions that were not caught by any try-catch block?

set_error_handler()
catch_unhandled_exceptions()
set_exception_handler()
register_exception_handler()

Question 30 of 38

What is the primary purpose of using namespaces in PHP?

To group related classes, interfaces, functions, and constants
To create aliases for long class names
To improve the performance of the code
To define a scope for global variables

Question 31 of 38

What is the primary difference between the strpos() and strstr() functions in PHP?

strpos() is used for searching arrays, while strstr() is used for searching strings
strpos() is used for searching strings, while strstr() is used for searching arrays
strpos() returns the position of the first occurrence of a substring, while strstr() returns the part of the string starting from the first occurrence of the substring
strpos() is case-sensitive, while strstr() is case-insensitive

Question 32 of 38

What is the primary purpose of the count() function in PHP?

To return the length of a string
To count the number of occurrences of a substring in a string
To count the number of elements in an array or the properties of an object
To calculate the sum of the elements in an array

Question 33 of 38

Which of the following is NOT a valid way to define a function in PHP?

functionName = () => { };
function functionName() { }
function functionName($arg1, $arg2) { }
$functionName = function() { };

Question 34 of 38

What is the main difference between the echo and print statements in PHP?

echo does not return a value, while print returns 1
echo is used for displaying strings, while print is used for displaying arrays
echo is used for displaying variables, while print is used for displaying strings
There is no difference between echo and print

Question 35 of 38

What is the main purpose of the isset() function in PHP?

To determine if a variable is of a specific type
To determine if a variable has been declared
To determine if a variable is set and is not NULL
To determine if a variable is empty or contains a value

Question 36 of 38

What is the primary purpose of the array_merge() function in PHP?

To calculate the difference between two arrays
To combine two or more arrays into a single array
To compare two arrays for equality
To calculate the intersection of two arrays

Question 37 of 38

What is the primary difference between the array_push() and array_unshift() functions in PHP?

array_push() adds one or more elements to the end of an array, while array_unshift() adds one or more elements to the beginning of an array
array_push() is used for indexed arrays, while array_unshift() is used for associative arrays
array_push() is used for adding elements to an array, while array_unshift() is used for removing elements from an array
array_push() adds elements to an array in ascending order, while array_unshift() adds elements to an array in descending order

Question 38 of 38

What is the primary purpose of the array_key_exists() function in PHP?

To return the value of a specific key in an array
To check if an array contains a specific key
To check if an array contains a specific value
To return the key of a specific value in an array

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Quiz – PHP

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