# DOMNodeList::item

(PHP 5, PHP 7, PHP 8)

DOMNodeList::item — Retrieves a node specified by index

### 说明

public DOMNodeList::item(int `$index`): DOMElement|DOMNode|DOMNameSpaceNode|null

Retrieves a node specified by `index` within the DOMNodeList object.

小技巧

If you need to know the number of nodes in the collection, use the `length` property of the DOMNodeList object.

### 参数

`index`

  Index of the node into the collection.

### 返回值

The node at the `index`th position in the DOMNodeList, or `null` if that is not a valid index.

### 示例

示例 #1 Traversing all the entries of the table

`<?php
$doc = new DOMDocument;
$doc->load('examples/book-docbook.xml');
$items = $doc->getElementsByTagName('entry');
for ($i = 0; $i < $items->length; $i++) {
echo $items->item($i)->nodeValue . "\n";
}
?>`

示例 #2 Accessing item with array syntax

`<?php
$doc = new DOMDocument;
$doc->load('examples/book-docbook.xml');
$items = $doc->getElementsByTagName('entry');
for ($i = 0; $i < $items->length; $i++) {
echo $items[$i]->nodeValue . "\n";
}
?>`

示例 #3 Traversing items with `foreach`

`<?php
$doc = new DOMDocument;
$doc->load('examples/book-docbook.xml');
$items = $doc->getElementsByTagName('entry');
foreach ($items as $item) {
echo $item->nodeValue . "\n";
}
?>`

以上示例会输出：

    Title
    Author
    Language
    ISBN
    The Grapes of Wrath
    John Steinbeck
    en
    0140186409
    The Pearl
    John Steinbeck
    en
    014017737X
    Samarcande
    Amine Maalouf
    fr
    2253051209

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