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Alexandr Bordun Borales
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<?php
/**
* CStackIterator class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright 2008-2013 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/

/**
* CStackIterator implements an iterator for {@link CStack}.
*
* It allows CStack to return a new iterator for traversing the items in the stack.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package system.collections
* @since 1.0
*/
class CStackIterator implements Iterator
{
/**
* @var array the data to be iterated through
*/
private $_d;
/**
* @var integer index of the current item
*/
private $_i;
/**
* @var integer count of the data items
*/
private $_c;

/**
* Constructor.
* @param array $data the data to be iterated through
*/
public function __construct(&$data)
{
$this->_d=&$data;
$this->_i=0;
$this->_c=count($this->_d);
}

/**
* Rewinds internal array pointer.
* This method is required by the interface Iterator.
*/
public function rewind()
{
$this->_i=0;
}

/**
* Returns the key of the current array item.
* This method is required by the interface Iterator.
* @return integer the key of the current array item
*/
public function key()
{
return $this->_i;
}

/**
* Returns the current array item.
* This method is required by the interface Iterator.
* @return mixed the current array item
*/
public function current()
{
return $this->_d[$this->_i];
}

/**
* Moves the internal pointer to the next array item.
* This method is required by the interface Iterator.
*/
public function next()
{
$this->_i++;
}

/**
* Returns whether there is an item at current position.
* This method is required by the interface Iterator.
* @return boolean
*/
public function valid()
{
return $this->_i<$this->_c;
}
}
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