DOMNode::cloneNode

(PHP 5, PHP 7)

DOMNode::cloneNode — Clones a node

说明

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

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.

用户评论:

[#1] h-fate at gmx dot net [2014-10-01 19:48:18]

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); } } ?>

[#2] frame at dynamiccreated dot de [2012-12-02 02:19:48]

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.

[#3] cemkalyoncu at gmail dot com [2009-04-28 03:04:14]

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; } ?>

[#4] [montana] at [percepticon] dot [com] [2009-02-16 02:23:59]

<?php //@oliver thanks for example source... //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();

?>

[#5] oliver dot christen at camptocamp dot com [2004-11-19 08:48:29]

simple exemple of node cloning

<?phpxml 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); $query = "//author foreach($nodeElmt as $nodeElmt) { if($nodeElmt->hasChildNodes()) { echo "This node has childnodes"; } else { echo "This node has no childnodes"; } } ?>

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Output:

This node has childnodes

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