Placement Preparationan HCL GUVI product
Q61
Q61 What does the final keyword signify when applied to a method in PHP?
The method cannot be overridden
The method is the last in the class
The method is static
The method is the most important in the class
Q62
Q62 How is a static property accessed in a PHP class?
With the new keyword
With the -> operator
Using the class name and ::
Using the $this keyword
Q63
Q63 What will be the output of the following PHP code?
class Test {
public $prop = 'Hello';
}
$obj = new Test();
echo $obj->prop;
Hello
Test
prop
Error
Q64
Q64 Consider the PHP class:
class Circle {
private $radius;
public function __construct($r) {
$this->radius = $r;
}
public function getArea() {
return pi() *
$this->radius * $this->radius; }
}
$circle = new Circle(3);
echo $circle->getArea();
The area of a circle with radius 3
Syntax error
No output
Error due to private property access
Q65
Q65 What is the result of calling the following PHP code?
class Animal {
protected $sound = "No sound";
public function makeSound() {
return $this->sound;
}
}
class Dog extends Animal {
protected $sound = "Bark";
}
$dog = new Dog();
echo $dog->makeSound();
Bark
No sound
Error
Dog
Q66
Q66 Identify the error in the following PHP class definition:
class Car {
function __construct() {
$this->model = '';
}
public function getModel() {
return model;
}
}
Undefined variable model
Syntax error in constructor
Missing property declaration
No error in the code
Q67
Q67 Find the mistake in this PHP code involving object-oriented principles:
class Book { public $title; public function __construct(title) { $this->title = title; } }
Missing $ before parameter in constructor
Syntax error in property declaration
No error in the code
Error in method definition
Q68
Q68 In PHP, which operator is used at the beginning of an expression to suppress error messages that it may generate?
@
#
$
!
Q69
Q69 What is the purpose of the try and catch block in PHP?
To detect and handle syntax errors
To manage program flow
To handle exceptions and errors
To debug code
Q70
Q70 Which PHP function is used to set a custom error handler?
set_error_handler()
error_report()
handle_error()
trigger_error()
Q71
Q71 What is the difference between exceptions and errors in PHP?
Exceptions can be caught and handled, errors cannot
Errors are for system-level issues, exceptions are for script issues
Exceptions are fatal, errors are not
There is no difference
Q72
Q72 What will happen if an exception is not caught in PHP?
The script will continue running
A fatal error will occur
The exception will be ignored
The script will pause
Q73
Q73 Given the code:
$num = -1;
try {
if($num < 0) {
throw new Exception("Negative number");
}
} catch (Exception $e) {
echo $e->getMessage();
}
What will be output?
Negative number
Nothing
Exception in script
Error
Q74
Q74 Identify the error in this PHP error handling code:
try {
//code } catch() {
echo "Error occurred";
}
Empty catch block
Missing exception type in catch block
Syntax error in try block
No error in the code
Q75
Q75 Spot the mistake in this PHP exception handling:
try {
$value = 10/0;
}
catch (Exception $e) {
echo "Caught exception: ", $e->getMessage();
}
Dividing by zero is not caught
Incorrect message concatenation
No mistake, it will catch and display the exception
The variable $e is not defined
Q76
Q76 In PHP, which function is used to open a file?
fopen()
open_file()
file_open()
open()
Q77
Q77 Which file mode in PHP can be used to open a file for both reading and writing, and places the file pointer at the beginning?
r+
w+
a+
x+
Q78
Q78 What does the PHP file_get_contents() function do?
Reads the entire file into a string
Deletes the specified file
Creates a new file
Writes content to a file
Q79
Q79 In PHP, how do you check if a file exists and is readable?
Using is_readable() and file_exists()
Using file_exists()
Using can_read()
Using fopen() and checking if it's false
Q80
Q80 What is the result of the following PHP code?
$file = fopen("test.txt", "w"); fwrite($file, "Hello, World!"); fclose($file);
A new file named "test.txt" is created with "Hello, World!" inside
An error occurs
Nothing happens
The file "test.txt" is deleted
Q81
Q81 In PHP, what does the file_put_contents() function do when the FILE_APPEND flag is used?
Replaces the content of the file
Deletes the file and creates a new one
Appends content to the end of the file
Creates a new file
Q82
Q82 Identify the error in this PHP file handling code:
$file = fopen("nonexistent.txt", "r"); fwrite($file, "Data"); fclose($file);
The file does not exist
Incorrect mode for fwrite
Syntax error
No error in the code
Q83
Q83 Spot the mistake in this PHP code for reading a file:
$file = fopen("file.txt", "r");
$data = fread($file, filesize("file.txt"));
fclose($file); echo $data;
There is no mistake
Missing error handling for file opening
Incorrect use of filesize()
The file is not closed properly
Q84
Q84 What is the primary purpose of using prepared statements in PHP?
To optimize query execution speed
To improve code readability
To protect against SQL injection attacks
To handle large datasets
Q85
Q85 In PHP, what security measure should be implemented to protect sensitive data, like passwords, stored in a database?
Storing them as plain text with unique identifiers
Encrypting them using reversible encryption
Hashing them using a cryptographic hash function
Compressing them before storage
Q86
Q86 What is Cross-Site Request Forgery (CSRF) and how can it be prevented in PHP?
A type of attack where a malicious website performs actions on behalf of a user on another website
Using SSL certificates
Validating user input
Using tokens in forms
Q87
Q87 How can htmlspecialchars() function in PHP help in preventing security risks?
By encrypting data
By suppressing error messages
By converting special characters to HTML entities, thus preventing XSS attacks
By validating user input
Q88
Q88 In PHP, how can you securely handle file uploads to prevent malicious files from being uploaded?
By checking the file extension only
By limiting the file size
By validating the MIME type and checking file extensions, and storing files outside the web directory
By renaming files upon upload
Q89
Q89 Identify the security flaw in this PHP code snippet:
if (isset($_GET['user_id'])) {
$user_id = $_GET['user_id']; // Perform database query }
The user input is not sanitized before being used
No error in the code
The user ID should be stored in a session
The user ID should be encrypted
Q90
Q90 Spot the vulnerability in this PHP session handling:
session_start();
if (!isset($_SESSION['user'])) {
header('Location: login.php');
}
The session is not regenerated upon login
The session ID is not stored securely
There is no vulnerability in this code
The header location is not absolute
