Immutable value object

Person.php

<?php
namespace MyProject;

class Person
{
    private $data;
    
    /**
     * 
     *  [
     *      'id' => <id>,
     *      'name' => 'name',
     *      'insertDate' => '2014-04-17 15:53:00'
     *  ]
     * 
     * @param array $data
     **/
    public function __construct(array $data)
    {
        $this->data = $data;
    }
    
    /**
     * @return string
     **/
    public function getInsertTime()
    {
        return strtotime($this->data['insertDate']);
    }

    /**
     * __get 
     * 
     * @param mixed string
     * @access public
     * @return mixed
     */
    public function __get($name)
    {
        static $forbidden = array('insertDate');
        
        if (array_key_exists($name, $this->data) && !in_array($name, $forbidden)) {
            switch ($name) {
                case 'insertTime':
                    $ret = $this->getInsertTime();
                    break;
                default:
                    $ret = $this->data[$name];
                    break;
            }
        } else {
            throw new \DomainException("No such key: `$name`");
        }
        
        return $ret;
    }

}