Quiz: Advanced PHP & Database Integration (MySQL)

Question 1: Which of the following best describes encapsulation?

A. Protecting the internal state of an object and restricting access B. Making all class properties accessible globally C. Allowing multiple classes to share the same properties D. Defining relationships between multiple objects

Question 2: What is a class in PHP?

A. A function that performs a specific task B. A variable that stores arrays C. A PHP extension for handling database connections D. A blueprint for creating objects

Question 3: Which OOP principle allows a class to inherit methods and properties from another class?

A. Polymorphism B. Inheritance C. Encapsulation D. Abstraction

Question 4: What does the $this keyword refer to in PHP?

A. The current object instance B. The parent class C. The global namespace D. The static properties of a class

Question 5: Which keyword is used to inherit a class in PHP?

A. inherit B. extends C. extend D. include

Question 6: What is polymorphism in OOP?

A. Protecting object properties from outside interference B. Enforcing strict types for methods C. Allowing multiple classes to share the same methods with different implementations D. Limiting inheritance to a single class

Question 7: Which access modifier makes a property or method accessible only within the class it is defined in?

A. public B. protected C. private D. static

Question 8: What does the interface keyword define in PHP?

A. A class with private methods B. A blueprint for classes, defining required methods C. A class that cannot be instantiated D. A database connection utility

Question 9: Why is inheritance useful in PHP OOP?

A. It allows classes to implement multiple interfaces B. It allows private properties to be shared between classes C. It automatically creates instances of a parent class D. It enables the reuse of code in a hierarchical structure

Question 10: What is the role of a constructor in a PHP class?

A. To initialize object properties when the object is created B. To define all properties of a class C. To handle exceptions within a class D. To enforce encapsulation in the class

Question 11: What is the purpose of the final keyword in PHP OOP?

A. To make properties accessible only in parent classes B. To terminate the execution of a class C. To declare a method that cannot be overridden in a subclass D. To implement an abstract method

Question 12: Which keyword is used to prevent a class from being instantiated directly?

A. protected B. abstract C. static D. final

Question 13: Why is encapsulation important in OOP?

A. It ensures that objects of different classes can interact B. It enforces the use of global variables for better control C. It allows methods to be inherited from parent classes D. It protects the internal state of objects and provides controlled access