4
我試圖在我的課上實現OuterIterator
接口,但我不確定在方法getInnerIterator
中使用什麼。我知道它應該返回一個Iterator,但我不知道它應該在什麼情況下返回InnerIterator
,儘管它已經具有Iterator接口的所有方法,那麼爲什麼它需要一個InnerIterator
?瞭解OuterIterator接口PHP
我完全有OuterIterator
class myouterIterator implements OuterIterator
{
/**
* Returns the inner Iterator for the current entry
*/
public $data = array(1,2,3,4,5,6,7,8,9,10);
public $position = 0;
public function getInnerIterator()
{
// What code should be place here
}
public function rewind()
{
$this->position = 0;
}
public function valid()
{
return isset($this->data[$this->position]);
}
public function key()
{
return $this->position;
}
public function current()
{
return $this->data[$this->position];
}
public function next()
{
++$this->position;
}
}
$OuterIt = new myouterIterator();
foreach($OuterIt as $key => $value)
{
echo $key, ' ', $value, '<br>';
}