<?php
require_once 'Employee.php';

class Employees implements IteratorAggregate
{
    private $_employees;

    public function __construct()
    {
        $this->_employees = new ArrayObject();
    }

    public function add(Employee $employee)
    {
        $this->_employees[] = $employee;
    }

    public function getIterator()
    {
        return $this->_employees->getIterator();
    }
}