DictionaryIterator.php 1.96 KB
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<?php
/**
 * @link http://www.yiiframework.com/
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 * @copyright Copyright (c) 2008 Yii Software LLC
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 * @license http://www.yiiframework.com/license/
 */

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namespace yii\base;

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/**
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 * DictionaryIterator implements the SPL `Iterator` interface for [[Dictionary]].
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 *
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 * It allows [[Dictionary]] to return a new iterator for data traversing purpose.
 * You normally do not use this class directly.
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 *
 * @author Qiang Xue <qiang.xue@gmail.com>
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 * @since 2.0
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 */
class DictionaryIterator implements \Iterator
{
	/**
	 * @var array the data to be iterated through
	 */
	private $_d;
	/**
	 * @var array list of keys in the map
	 */
	private $_keys;
	/**
	 * @var mixed current key
	 */
	private $_key;

	/**
	 * Constructor.
	 * @param array $data the data to be iterated through
	 */
	public function __construct(&$data)
	{
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		$this->_d = &$data;
		$this->_keys = array_keys($data);
		$this->_key = reset($this->_keys);
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	}

	/**
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	 * Rewinds the index of the current item.
	 * This method is required by the SPL interface `Iterator`.
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	 */
	public function rewind()
	{
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		$this->_key = reset($this->_keys);
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	}

	/**
	 * Returns the key of the current array element.
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	 * This method is required by the SPL interface `Iterator`.
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	 * @return mixed the key of the current array element
	 */
	public function key()
	{
		return $this->_key;
	}

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

	/**
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	 * Moves the internal pointer to the next element.
	 * This method is required by the SPL interface `Iterator`.
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	 */
	public function next()
	{
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		$this->_key = next($this->_keys);
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	}

	/**
	 * Returns whether there is an element at current position.
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	 * This method is required by the SPL interface `Iterator`.
	 * @return boolean whether there is an item at current position.
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	 */
	public function valid()
	{
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		return $this->_key !== false;
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	}
}