DOMNode::cloneNode

(PHP 5, PHP 7, PHP 8)

DOMNode::cloneNode — Clones a node

说明

public DOMNode::cloneNode(bool $deep = false): DOMNode|false

Creates a copy of the node.

参数

deep: Indicates whether to copy all descendant nodes. This parameter is defaulted to false.

返回值

The cloned node.

add a note

User Contributed Notes 6 notes

down

frame at dynamiccreated dot de ¶

9 years ago


Remeber that DOMNode always needs a reference to a parent node or DOMDocument.

For example, if you try to clone a node - copy all children - and overwrite or delete the variable which holds the cloned node - all children will loose any reference and getting invalid.

This will cause a nice message like "Couldn't... node no longer exists" if you have luck. In most cases PHP only gives you the poor information "Couldn't fetch DOM[...]" which makes hard to find out whats going on, depending on the current operation.

down

[montana] at [percepticon] dot [com] ¶

13 years ago


<?php

//@oliver thanks for example source...

/*
 cloneNode(false) does not omit 
 Attributes of cloned node, 
 to achieve this an iteration is required. 
 this is probably less efficient 
 than merely creating a new 
 node from the desired nodeName 
 but in some cases could be useful.

use case: 

omit subnodes and attributes of 
secured portions of an xml document 
without altering expected general structure;
*/
//xml to use

$file="<?xml version='1.0'?>
<book type='paperback'>
    <title name='MAP'>Red Nails</title>
    <price>$12.99</price>
    <author>
        <name first='Robert' middle='E' last='Howard'/>
        <birthdate disco='false' nirvana='definitely'>
            9/21/1977 
            <month title='september' />
        </birthdate>
    </author>
    <author>
        <name first='Arthur' middle='Mc' last='Kayn'/>
    </author>
</book>";

$doc = new domDocument;

$doc->loadXML($file);

$xpath = new domXPath($doc);

$query = "//author/birthdate";
$xpathQuery = $xpath->query($query);

//would be a loop in production code...
$child = $xpathQuery->item(0); 

$parent = $child->parentNode;

$doppel = $child->cloneNode(false);

$limit = $doppel->attributes->length;

for ($a=0;$a<$limit;$a++) {
    $doppel->removeAttributeNode($doppel->attributes->item(0));
}
//swap for now empty node
$parent->replaceChild( $doppel, $child); 

print $doc->saveXML();

?>

down

cmd at 1xinternet dot de ¶

5 years ago


If you need to clone node including all child DOMNode elements:

private function cloneNode($node){

        $nd = new DOMNode();

        for ($i = 0; $i < $node->childNodes->length; $i++) {
            $child = $node->childNodes->item($i);
            if ($child->nodeType === XML_TEXT_NODE) {
                $nd->appendChild($node->cloneNode(true));
            }
            else{
                $nd->appendChild($this->cloneNode($child));
            }
        }

        return $nd;
    }

down

cemkalyoncu at gmail dot com ¶

13 years ago


If you need some function to clone a node without touching namespaces you can use the following.

<?php
private function cloneNode($node,$doc){
    $nd=$doc->createElement($node->nodeName);
            
    foreach($node->attributes as $value)
        $nd->setAttribute($value->nodeName,$value->value);
            
    if(!$node->childNodes) 
        return $nd;
                
    foreach($node->childNodes as $child) {
        if($child->nodeName=="#text")
            $nd->appendChild($doc->createTextNode($child->nodeValue));
        else
            $nd->appendChild(cloneNode($child,$doc));
    }
            
    return $nd;
}
?>

down

h-fate at gmx dot net ¶

7 years ago


If you have an object that holds a DOMNode, cloning the object won't clone the DOMNode with it. If you simply copy the object or add its DOMNode several times, you will in fact only move the DOMNode in the tree, not multiply it. That might seem obvious, but took me half a day to find out.

The object needs to use __clone and clone the node manually:

<?php
class containsNode {
    public $node; //set from somewhere

    public function __clone() {
        $this->node = $this->node->cloneNode(TRUE);
    }
}
?>

down

-5

oliver dot christen at camptocamp dot com ¶

17 years ago


simple exemple of node cloning


<?xml version="1.0"?>


<book type="paperback">

    <title name='MAP'>Red Nails</title>

    <price>$12.99</price>

    <author>

        <name first="Robert" middle="E" last="Howard"/>

        <birthdate>9/21/1977</birthdate>

    </author>

    <author>

        <name first="Arthur" middle="Mc" last="Kayn"/>

    </author>

</book>


<?php


//filename xml file to use

$file = 'book.xml';


$doc = new domDocument;


if (file_exists($file)) {

    $doc->load($file);

} else {

    exit('Erreur !.');

}


$xpath = new domXPath($doc);


$query = "//author/*";

$xpathQuery = $xpath->query($query);


$size = $xpathQuery->length;

for ($i=0; $i<$size; $i++){

    $node = $xpathQuery->item($i);

    if ($node->nodeName == 'birthdate' && $node->hasChildNodes() && $node->firstChild->textContent != ''){

        $clonenode = $node->cloneNode(true);

        $refnode = $node;

    }

}

for ($i=0; $i<$size; $i++){

    $node = $xpathQuery->item($i);

    if (!$node->isSameNode($refnode)){

        $newnode = $node->appendChild($clonenode);

    }

}


print $doc->saveXML();


?>

add a note

官方地址：https://www.php.net/manual/en/domnode.clonenode.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 adodb手册 opcache预加载 Composer的Packagist资源 mysql面试题 php中几种注释规范支持php7的性能采集扩展 [原创]诡异的php-fpm超时问题 php扩展开发 PHP7 mcrypt替代方案 Packagist / Composer 中国全量镜像 laravel框架查看sql语句方式

略微加速

PHP官方手册 - 互联网笔记

DOMNode::cloneNode

说明

参数

返回值

User Contributed Notes 6 notes