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

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

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

Consider the code below. Which modification best applies encapsulation principles?

Make the $balance private and provide getter/setter with validation

A developer argues that using getter and setter methods is unnecessary if all properties are public. What's the best response?

"Encapsulation promotes data integrity and control, which public properties lack."

"You're right; it's more efficient."

"Public access ensures better performance."

"Public variables are part of encapsulation."

Which of the following best defines an interface in PHP?

A contract that classes must implement

Which of the following statements is TRUE about abstract classes?

They can contain both abstract and non-abstract methods.

They can be instantiated directly.

They must contain only private methods.

They cannot have any properties.

What happens if a class implements an interface but does not define all its methods?

It will result in a fatal error.

The interface methods are ignored.

Given the interface: interface Logger { public function log(string $message): void; } Which class correctly implements the interfaces?

class FileLogger implements Logger { public function log(string $message): void {} }

class FileLogger { public function log(string $msg) {} }

class FileLogger implements Logger { public function write(string $message): void {} }

class Logger implements FileLogger { public function log(string $message): void {} }

Which of the following demonstrates polymorphism using interfaces?

$dog = new Dog(); $cat = new Cat(); $dog->makeSound(); $cat->makeSound();

function logMessage(Logger $logger) { $logger->log("Test message"); }

class A {} class B extends A {}

Given an abstract class Animal with an abstract method makeSound(), what must a child class like Dog do?

Override makeSound() with a concrete implementation

Which of the following combinations is correct?

abstract class A implements Logger

class A extends Logger implements Animal

interface A extends class Logger

interface A extends LoggerClass

You want to ensure all logging classes use a standard log() method, but allow each to handle storage differently. Which structure is best?

Use an interface Logger and implement it in all classes

Use an abstract class with default logging logic

Use inheritance from a base class

You are designing a class hierarchy where Bird is abstract. Duck can fly, but Ostrich cannot. Where should the fly() method be placed?

Inside Bird as an abstract method

Inside Bird as a concrete method

Only in Duck, since not all birds can fly

In an interface and implemented by Bird

When should you choose an interface over an abstract class?

When you only need to enforce a contract across unrelated classes

When you want to share method implementations

When you need to define optional methods

When you want multiple inheritance of behavior

Why is autoloading preferred over manual require statements?

It automates class file inclusion based on usage

It loads all files before execution

Which approach ensures that namespaced classes from multiple vendors don't conflict with each other?

Using Composer with PSR-4 and distinct namespaces

You created a custom autoloader but your app still throws a "class not found" error. What is the likely issue?

The file path doesn't match the namespace structure

The class is in the global scope

The class doesn't have a constructor

You used include_once instead of require

Which of the following correctly demonstrates namespaced class usage with an alias?

use App\Models\User as U; $user = new U();

use App\Models\User; $user = new User();

use App\Models\User as U; $user = new App\Models\User();

use App\Models\User; $user = new U();

Object Oriented Programming Quiz

Quiz

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Information Technology (IT)

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4th Grade

•

Practice Problem

•

Medium

Cecilio Salonoy

Used 2+ times

FREE Resource

Student preview

$person->getName();

$person->__get();

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