Idea for entities to act more java like with regards to private setters and public access to the properties

ImmutableEntity.php

<?php
namespace Domain\Shared;

// create this separately
use Domain\Exception\InvalidProperty;
use Domain\Exception\Immutable;

/**
 * Allows public access to the private properties of an object.
 * 
 * Prevents external modification to the properties. Reflection and objects are the most likely exceptions to this.
 */
trait ImmutableEntity
{
	/**
	 * Tests if the property is set
	 *
	 * @param string $name
	 * @return bool
	 */
	public function __isset($name)
	{
		return (property_exists($this, $name) && isset($this->$name));
	}

	/**
	 * Returns the property
	 *
	 * @param string $name
	 * @return bool
	 */
	public function __get($name)
	{
		if (property_exists($this, $name)) {
			return $this->$name;
		}

		throw new InvalidProperty($name);
	}

	/**
	 * Sets the property
	 *
	 * @param string $name
	 * @return bool
	 */
	public function __set($name, $value)
	{
		throw new Immutable();
	}
}