public-parameters-oop-final-example

<?php

ini_set('display_errors', 1); 
ini_set('display_startup_errors', 1); 
error_reporting(E_ALL);

class Person {

	protected $name = 'No Name';
	private $birthYear = 'No Year';

	public function getName()
	{
		return $this->name;
	}

	public function setName($name)
	{
		$this->name = $name;
	}

	public function getBirthYear()
	{
		return $this->birthYear;
	}

	public function setBirthYear($birthYear)
	{
		$this->birthYear = $birthYear;
	}

}

class Employee extends Person {

	private $job;

	public function setName($name)
	{
		// protected in Person()
		$this->name = 'Employee: ' . $name;
	}

	public function setBirthYear($birthYear)
	{
		// private in Person()
		$this->birthYear = 'Birth: ' . $birthYear;
	}

}

$employee = new Employee();

$employee->setName('Name');
echo $employee->getName();		// return Employee: Name. As the property is PROTECTED 
					// the subclass CAN alter it.

$employee->setBirthYear('1900');
echo $employee->getBirthYear();		// return No Year. As the property is PRIVATE 
					// the subclass CANNOT alter it.