What is the difference between public, protected and private?

PHP has three access modifiers such as public, private, and protected.

• public scope of this variable or function is available from anywhere, other classes, and instances of the object.
• private scope of this variable or function is available in its class only.
• protected scope of this variable or function is available in all classes that extend the current class including the parent class.

Note: One of the most tricky oops interview questions in php, you need to answer this question with utmost clarity. Maybe explaining it with a short example or even a dry run would help you get that dream job.