# The DOMNamedNodeMap class

(PHP 5, PHP 7, PHP 8)

## 类摘要

class DOMNamedNodeMap implements IteratorAggregate, Countable {
/* 属性 */
public readonly int $length;
/* 方法 */
public count(): int
public getIterator(): Iterator
public getNamedItem(string `$qualifiedName`): ?DOMNode
public getNamedItemNS(?string `$namespace`, string `$localName`): ?DOMNode
public item(int `$index`): ?DOMNode
}

## 属性

length

  The number of nodes in the map. The range of valid child node indices is `0` to `length - 1` inclusive.

## 更新日志

版本 | 说明
--- | ---
8.0.0 | The unimplemented methods DOMNamedNodeMap::setNamedItem(), DOMNamedNodeMap::removeNamedItem(), DOMNamedNodeMap::setNamedItemNS() and DOMNamedNodeMap::removeNamedItem() have been removed.
8.0.0 | DOMNamedNodeMap implements IteratorAggregate now. Previously, Traversable was implemented instead.

## 注释

> 注意: Nodes in the map can be accessed by array syntax.

## 目录

- DOMNamedNodeMap::count — Get number of nodes in the map
- DOMNamedNodeMap::getIterator — Retrieve an external iterator
- DOMNamedNodeMap::getNamedItem — Retrieves a node specified by name
- DOMNamedNodeMap::getNamedItemNS — Retrieves a node specified by local name and namespace URI
- DOMNamedNodeMap::item — Retrieves a node specified by index

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