PHP | DOMNode replaceChild() Function
Last Updated :
17 Mar, 2020
The DOMNode::replaceChild() function is an inbuilt function in PHP which is used replace the old child node with the passed new node. Further, if the new node is already a child it will not be added the second time. If the replacement succeeds the old node is returned.
Syntax:
DOMNode DOMNode::replaceChild( DOMNode $newnode, DOMNode $oldnode )
Parameters: This function accept two parameters as mentioned above and described below:
- $newnode: It specifies the new node.
- $oldnode: It specifies the old node.
Return Value: This function returns old node or FALSE if an error occur.
Exceptions: This function throws DOM_NO_MODIFICATION_ALLOWED_ERR, if this node is read-only or if the previous parent of the node being inserted is read-only, DOM_HIERARCHY_REQUEST_ERR, if this node is of a type that does not allow children of the type of the $newnode node, or if the node to put in is one of this node’s ancestors or this node itself, DOM_WRONG_DOCUMENT_ERR, if $newnode was created from a different document than the one that created this node, DOM_NOT_FOUND, if $oldnode is not a child of this node.
Below examples illustrate the DOMNode::replaceChild() function in PHP:
Program 1:
<?php
$document = new DOMDocument();
$element = $document ->appendChild( new DOMElement( 'root' ));
$text1 = $document ->createTextNode( 'Hello ! ' );
$text2 = $document ->createTextNode( 'Text to be replaced' );
$text3 = $document ->createTextNode( 'replaced' );
$element ->appendChild( $text1 );
$element ->appendChild( $text2 );
$element ->replaceChild( $text3 , $text2 );
echo $document ->saveXML();
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Output:
<?xml version="1.0"?>
<root>Hello ! replaced</root>
Example 2:
<?php
$document = new DOMDocument();
$element = $document ->appendChild( new DOMElement( 'h1' ));
$text1 = $document ->createTextNode( 'Geeksfor' );
$text2 = $document ->createTextNode( 'Text to be removed' );
$text3 = $document ->createTextNode( 'Geeks' );
$element ->appendChild( $text1 );
$element ->appendChild( $text2 );
$element ->replaceChild( $text3 , $text2 );
echo $document ->saveXML();
?>
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Output:
<?xml version="1.0"?>
<root>GeeksforGeeks</root>
Reference: https://www.php.net/manual/en/domnode.replacechild.php
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