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PHP - Manual: DOMNode::compareDocumentPosition - 互联网笔记

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PHP官方手册 - 互联网笔记

PHP - Manual: DOMNode::compareDocumentPosition

2025-06-02

DOMNode::compareDocumentPosition

(PHP 8 >= 8.4.0)

DOMNode::compareDocumentPositionCompares the position of two nodes

说明

public DOMNode::compareDocumentPosition(DOMNode $other): int

Compares the position of the other node relative to this node.

参数

other

The node for which the position should be compared for, relative to this node.

返回值

A bitmask of the DOMNode::DOCUMENT_POSITION_* constants.

示例

示例 #1 DOMNode::compareDocumentPosition() example

<?php
$xml
= <<<XML
<root>
<child1/>
<child2/>
</root>
XML;

$dom = new DOMDocument();
$dom->loadXML($xml);

$root = $dom->documentElement;
$child1 = $root->firstElementChild;
$child2 = $child1->nextElementSibling;

var_dump($root->compareDocumentPosition($child1));
var_dump($child2->compareDocumentPosition($child1));
?>

以上示例会输出:

int(20) // This is DOMNode::DOCUMENT_POSITION_CONTAINED_BY | DOMNode::DOCUMENT_POSITION_FOLLOWING
int(2)  // This is DOMNode::DOCUMENT_POSITION_PRECEDING
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官方地址:https://www.php.net/manual/en/domnode.comparedocumentposition.php

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