Method overriding in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is method overriding in PHP?

Method overriding in PHP is when a child class defines a method with the same name as a method in its parent class, replacing the parent's method behavior.

beginner

Why do we use method overriding?

We use method overriding to change or extend the behavior of a method inherited from a parent class, allowing child classes to customize functionality.

intermediate

How do you call the parent class method inside an overridden method in PHP?

You use <code>parent::methodName()</code> inside the child class method to call the parent class's version of the method.

beginner

What happens if the child class does not override a method from the parent class?

If the child class does not override the method, it inherits and uses the parent's method as is.

intermediate

Can private methods be overridden in PHP?

No, private methods cannot be overridden because they are not accessible to child classes.

What keyword is used to call the parent class method inside an overridden method in PHP?

A parent::

B super::

C this::

D base::

In PHP, parent::methodName() calls the parent class's method.

If a child class overrides a method, which method is executed when called on the child object?

A Child class method

B Parent class method

C Both methods

D None

The child class method overrides the parent method and is executed.

Can a private method in a parent class be overridden by a child class in PHP?

A Yes, always

B Only if declared final

C No, private methods are not accessible

D Only if static

Private methods are not visible to child classes, so they cannot be overridden.

What happens if a child class does not override a method from its parent?

A Error occurs

B Parent method is used

C Method is ignored

D Child class must define it

The child class inherits and uses the parent's method if it does not override it.

Which of these is a reason to override a method?

A To avoid inheritance

B To delete the parent method

C To make the method private

D To change inherited method behavior

Overriding lets you change or extend the behavior of an inherited method.

Explain method overriding in PHP and how it helps in object-oriented programming.

Think about how child classes can change what they inherit.

Describe how to call a parent class method from an overridden method in PHP and why you might want to do that.

Sometimes you want to add to the parent's method, not just replace it.