DOMNode::normalize
Just a note, if you remove a node the whitespace it occupied will remain if you save the file.
To avoid this, use $document->preserveWhiteSpace = false;
For Example:
<?php
$document = new DomDocument();
$document->preserveWhiteSpace = false;
?>
DOMNode::removeChild
(PHP 5)
DOMNode::removeChild — 子要素群から子要素を削除する
パラメータ
- oldnode
-
削除する子要素。
返り値
子要素の削除に成功した場合に、削除した要素を返します。
エラー / 例外
- DOM_NO_MODIFICATION_ALLOWED_ERR
-
ノードが読み込み専用の場合に発生します。
- DOM_NOT_FOUND
-
oldnode がこのノードの子要素でない場合に発生します。
例
以下の例は、XML ドキュメントから chapter 要素を削除します。
例1 子要素の削除
<?php
$doc = new DOMDocument;
$doc->load('book.xml');
$book = $doc->documentElement;
// chapter を取得し、それを book から削除します
$chapter = $book->getElementsByTagName('chapter')->item(0);
$oldchapter = $book->removeChild($chapter);
echo $doc->saveXML();
?>
上の例の出力は以下となります。
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<book id="listing">
<title>My lists</title>
</book>
add a note
User Contributed NotesDOMNode::removeChild
Justin Carlson
05-Nov-2009 07:46
05-Nov-2009 07:46
crazy888s at hotmail dot com
15-Apr-2009 08:50
15-Apr-2009 08:50
You can't remove DOMNodes from a DOMNodeList as you're iterating over them in a foreach loop. For example...
<?php
$domNodeList = $domDocument->getElementsByTagname('p');
foreach ( $domNodeList as $domElement ) {
// ...do stuff with $domElement...
$domElement->parentNode->removeChild($domElement);
}
?>
... will seemingly leave the internal iterator on the foreach out of wack and results will be quite strange. Though, making a queue of items to remove seems to work. For example...
<?php
$domNodeList = $domDocument->getElementsByTagname('p');
$domElemsToRemove = array();
foreach ( $domNodeList as $domElement ) {
// ...do stuff with $domElement...
$domElemsToRemove[] = $domElement;
}
foreach( $domElemsToRemove as $domElement ){
$domElement->parentNode->removeChild($domElement);
}
?>
Justin Sheckler
30-Jan-2009 04:44
30-Jan-2009 04:44
These two functions might be helpful to anyone trying to delete a node and all of its children:
<?php
function deleteNode($node) {
deleteChildren($node);
$parent = $node->parentNode;
$oldnode = $parent->removeChild($node);
}
function deleteChildren($node) {
while (isset($node->firstChild)) {
deleteChildren($node->firstChild);
$node->removeChild($node->firstChild);
}
}
?>
tim cameron ryan
19-Jul-2008 08:00
19-Jul-2008 08:00
Or something like:
<?php
while ($node->childNodes->length)
$node->removeChild($node->firstChild);
?>
Michael D (DigitalGemstones.com)
05-Jul-2008 11:15
05-Jul-2008 11:15
Note that iterating through the childNodes array and removing those children will stop the iteration.
For example:
foreach($node->childNodes as $child)
{
if(iWantToDeleteThisNode($child))
$child->parentNode->removeChild($child);
}
Will not work. Note that in removing the node, the childNodes array gets rebuilt (it seems) and so only the first item will be removed. In order to properly remove all the children you want to remove, you will need to do something like the following:
$nodesToDelete = array();
foreach($node->childNodes as $child)
{
if(iWantToDeleteThisNode($child))
$nodesToDelete[] = $child;
}
foreach($nodesToDelete as $node)
{
$node->parentNode->removeChild($node);
}
I believe this is actually more efficient than the first snippet would be (if it worked) but obviously I cannot benchmark it.
Wala
04-Apr-2008 06:57
04-Apr-2008 06:57
I used the following to delete an entire node using the child element:
<?php
$childElement->parentNode->parentNode-> removeChild($childElement->parentNode);
?>
I could not have thought of it without the help of everyone who contributed to this thread.
Thanks!
(I had to introduce the extra space between parentNode->removeChild to get rid of the wordwrap() warning while posting this note)
Vasil Rangelov
06-Oct-2007 05:14
06-Oct-2007 05:14
At the time of writing, I suppose rightfully, removeChild() removes only the selected node, but when you remove an element, it's child elements are not removed. If you want to achieve that, replaceChild() is the solution.
The following should remove all descendants of the $node DOMNode, regardless of it's name:
<?php
$node->replaceChild(new DOMElement($node->nodeName), $node);
?>
If you're replacing the root element, you must explicitly state that with $node->documentElement as the second argument.
lsoethout at hotmail dot com
11-Mar-2007 05:08
11-Mar-2007 05:08
The previous example is not correct; it only works when the tags are direct childs of the top-level node.
Better is:
while($elem = $dom->getElementsByTagName("name")->item(0)) {
$elem->parentNode->removeChild($elem);
}
dave at dgx dot cz
28-Aug-2006 01:10
28-Aug-2006 01:10
remove all children of a given node (simple way):
$node->nodeValue = '';
mytto at openxtrem dot com
07-Sep-2005 09:20
07-Sep-2005 09:20
Back again on removing childs and iterators robustness.
Things get a bit more complicated when you only want to remove 'some' nodes according to a certain condition. Then you can't just remove the first one repeatedly.
The trick is to copy the content of the node list into a more robust collection than DOMNodeList, I name array!
The following piece of code will, for instance, remove all empty child nodes:
<?php
// Copy childNodes array
$childNodes = array();
foreach($node->childNodes as $childNode) {
$childNodes[] = $childNode;
}
// Browse with the copy
foreach ($childNodes as $childNode) {
if (!$childNode->hasChildNodes()); {
$childNode->parentNode->removeChild($childNode);
}
}
?>
karan
28-Aug-2005 09:48
28-Aug-2005 09:48
can we directly remove a node which has some children or do we need to remove the children first.
while($mytn->hasChildNodes())
{
$mytn->removeChild($mytn->childNodes->item(0));
}
echo $j;//this shows correct no of children
echo $mytn->childNodes->length;//after removing it
// shows 0..correct
$dom->save(net.xml);
but the changes r not reflected in the xml file
blaine (at) blainegarrett (dot com)
23-Aug-2005 05:10
23-Aug-2005 05:10
This might be obvious, but might help someone as well...
If you simply have a node that you need to remove (perhaps from an xpath) and don't know the parent node offhand (the examples seem to assume you have the parent in a variable), then you can do something easy like this...
$node->parentNode->removeChild($node);
parentNode is a scalar property of the Element.
Hope that helps.
--
Blaine Garrett
Executive Director of the Art Attack
http://theartattack.org
pedro at leb dot usp dot br
30-May-2005 11:24
30-May-2005 11:24
You may also use the hasChild function:
<?php
while($node->hasChildNodes()) {
$node->removeChild($node->childNodes->item(0));
}
?>
When you remove a childNode, the next node becomes the first one!
vsematika at centrum dot cz
13-Feb-2005 11:35
13-Feb-2005 11:35
For those who don't understand >sbeam at onsetcorps dot net on 02-Feb-2005 12:07< 'hack', here's a little discussion:
First but *wrong* try would be:
<?php
foreach ($parent->childNodes as $child) {
$parent->removeChild($child);
?>
This doesn't work because DOM tree id modified on-the-fly and this confuses foreach loop.
The idea behind sbeam's trick is that after removing the first item in the first iteration, the second item in childNodes nodelist immediately becomes the first item. That's why we must _always_ remove the first child. Here's another implementation:
<?php
$count = $parent->childNodes->length;
for ($i = 0; $i < $count; $i++) {
$oldNode = $parent->removeChild($parent->childNodes->item(0)); // !!! not item($i) !!!
}
?>
sbeam at onsetcorps dot net
02-Feb-2005 05:07
02-Feb-2005 05:07
remove all children of a given node:
while ($parent->childNodes->length) {
$parent->removeChild($parent->childNodes->item(0));
}