php教程

DOMNode::cloneNode

(PHP 5, PHP 7)

DOMNode::cloneNode — Clones a node

说明

public DOMNode::cloneNode ([ bool $deep ] ) : DOMNode

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.

User Contributed Notes

cmd at 1xinternet dot de 16-Nov-2016 12:11
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;
    }
h-fate at gmx dot net 01-Oct-2014 07:48
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);
    }
}
?>
frame at dynamiccreated dot de 02-Dec-2012 02:19
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.
cemkalyoncu at gmail dot com 28-Apr-2009 03:04
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;
}
?>
[montana] at [percepticon] dot [com] 16-Feb-2009 02:23
<?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();

?>
oliver dot christen at camptocamp dot com 19-Nov-2004 08:48
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();

?>

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