Immutable ValueObject example

ValueObject.php

<?php


class ValueObject
{

  protected $checked;
  protected $value;
  protected $exists;
  
  public function __construct($checked = false, $exists = false, $value = null)
  {
    $this->checked = $checked;
    $this->exists = $exists;
    $this->value = $value;
  }
  
  public function exists()
  {
    return $this->exists;
  }
  
  public function checked()
  {
    return $this->checked;
  }
  
  public function getValue()
  {
    return $this->value;
  }
}