• Encapsulation is to ascertain that each part of an application is seperate and doesn't interfere with any others.


• When defining a property in a class, you must specify whether it's public, private, or protected.


• Public properties are available to all parts of a PHP script, both inside and outside the class definition, and their values can be changed in the same way as any variable.


• Protected and private properties are invisible from external scripts, so they cannot be changed arbitrarily.

Example :

<?php
class Encapsulation
{
	private function display()
	{
		echo " This is private Function";
	}

}
class Test extends Encapsulation
{
	function display()
	{
		echo "This is sub class";
	}
}
$obj=new Encapsulation();
$obj->display();
?>

Output :

Fatal error: Call to private method Encapsulation::display()