Immutable status class.

status.php

<?php
class Status 
{
  const PUBLISHED = 10; 
  const DRAFT = 20;
  
  private $status;

  public static function published() 
  {
    return new self(self::PUBLISHED);
  }
  public static function draft() 
  { 
    return new self(self::DRAFT);
  }

  private function __construct($anStatus) 
  { 
    $this->status = $anStatus;
  }

  public function equalsTo(self $anStatus) 
  { 
    return $this->status === $anStatus->status;
  }
}