Object Oriented Programming Quiz

What is encapsulation in object-oriented programming?

• Writing code in a procedural style

• Allowing free access to all class properties

• Restricting direct access to some of an object's components

• Making code longer and more complex

Which access modifier is commonly used to implement encapsulation?

• public

• protected

• global

• private

In PHP, which keyword restricts property access to within the class only?

• public

• private

• external

• abstract

What is the purpose of getter methods in encapsulation?

• To delete object properties

• To provide controlled read access to private properties

• To directly change class variables

• To generate random values

What is the role of a setter method in a class?

• Sets cookies

• Assigns permissions to users

• Assigns a value to a private property using a public method

• Reads data from the database

Which of the following is a benefit of encapsulation?

• Slower performance

• No need for class constructors

• Better control over data and security

• Increased global variables

Given the following class, which method is used to access the $name property?

• $person->name;

• $person->setName();

• $person->getName();

• $person->__get();

What happens if you try to directly modify a private property from outside the class?

• PHP will automatically allow it

• The property value is reset to default

• A syntax warning is shown

• A fatal error occurs

You want to ensure that a user's age cannot be set to a negative number. What should the setter method include?

• return -$age;

• if ($age < 0) { $this->age = 0; }

• if ($age > 0) { $this->age = $age; }

• $this->age = $age + 1;

In the following class, which method would properly update the $age property?

• $user->age = 25;

• $user->setAge(25);

• $user->getAge();

• $user->updateAge();