//部門(mén)類(lèi)
class Department{
  private $_name;
  private $_employees;
  function __construct($name){
    $this->_name = $name;
    $this->employees = array();
  }
  function addEmployee(Employee $e){
    $this->_employees[] = $e;
    echo "員工{$e->getName()}被分配到{$this->_name}中去";
  }
}
//員工類(lèi)
class Employee{
  private $_name;
  function __construct($name){
    $this->_name = $name;
  }
  function getName(){
    return $this->_name;
  }
}
//應(yīng)用：
$lsgo = new Department('LSGO實(shí)驗(yàn)室');
$e1 = new Employee("小錦");
$e2 = new Employee("小豬");
$lsgo->addEmployee($e1);
$lsgo->addEmployee($e2);

class Department implements Iterator
{
  private $_name;
  private $_employees;
  private $_position;//標(biāo)志當(dāng)前數(shù)組指針位置
  function __construct($name)
  {
    $this->_name = $name;
    $this->employees = array();
    $this->_position = 0;
  }
  function addEmployee(Employee $e)
  {
    $this->_employees[] = $e;
    echo "員工{$e->getName()}被分配到{$this->_name}中去";
  }
  //實(shí)現(xiàn) Iterator 接口要求實(shí)現(xiàn)的方法
  function current()
  {
    return $this->_employees[$this->_position];
  }
  function key()
  {
    return $this->_position;
  }
  function next()
  {
    $this->_position++;
  }
  function rewind()
  {
    $this->_position = 0;
  }
  function valid()
  {
    return isset($this->_employees[$this->_position]);
  }
}
//Employee 類(lèi)同前
//應(yīng)用：
$lsgo = new Department('LSGO實(shí)驗(yàn)室');
$e1 = new Employee("小錦");
$e2 = new Employee("小豬");
$lsgo->addEmployee($e1);
$lsgo->addEmployee($e2);
echo "LSGO實(shí)驗(yàn)室部員情況：";
//這里其實(shí)遍歷的$_employee
foreach($lsgo as $val){
  echo "部員{$val->getName()}";
}

class Department implements Iterator,Countable{
  //前面同上
  //實(shí)現(xiàn)Countable中要求實(shí)現(xiàn)的方法
  function count(){
    return count($this->_employees);
  }
}
//應(yīng)用：
echo "員工數(shù)量：";
echo count($lsgo);