Violation of Encapsulation Example

violation-of-encapsulation-example.php

<?php
/*
	Following Explanation From Wikipedia
	https://en.wikipedia.org/wiki/Encapsulation_(computer_programming)
	Encapsulation is used to hide the values or state of a structured data object inside a class
 */
class AClass {
	private $propertyDoesntViolateEncapsulation = 0;

	private static $propertyViolatesEncapsulation = 0;

	public function methodDoesntViolateEncapsulation()
	{
		return ++$propertyDoesntViolateEncapsulation;
	}

	public static function methodViolatesEncapsulation()
	{
		return ++$propertyViolatesEncapsulation;
	}

	public static function butThisMethodDoesNotViolatesEncapsulation(int $initialCounter):self
	{
		$other = new self();
		$other->propertyDoesntViolateEncapsulation = $initialCounter;
		return $other;
	}
}
// Example below doesn't interfere each other in anyway
// . They are not coupled
// . They do not share any state so they cannot corrupt each other's state.
// . They are not aware each other

$anObject      = new AClass();
$anObject->methodDoesntViolateEncapsulation();

$anotherObject = new AClass();
$anotherObject->methodDoesntViolateEncapsulation();


// But now things come to a silly point.
// They basically set each other's state currently we coupled these 2 objects to each other by sharing a state
// This violates encapsulation. anObject accessed to anotherObject's state and otherway around.
$anObject::methodViolatesEncapsulation();
$anotherObject::methodViolatesEncapsulation();
$anObject::methodViolatesEncapsulation();
$anotherObject::methodViolatesEncapsulation();

// Here is the example that is relevant to our discussion
$someOtherObject = AClass::butThisMethodDoesNotViolatesEncapsulation(10);