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PHP | DOMElement setIdAttributeNode() Function

Last Updated : 26 Feb, 2020
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The DOMElement::setIdAttributeNode() function is an inbuilt function in PHP which is used to declare the attribute specified by DOMAttr instance to be of type ID. Syntax:
void DOMElement::setIdAttributeNode( DOMAttr $attr, bool $isId )
Parameters: This function accepts two parameters as mentioned above and described below:
  • $attr: It specifies the attribute as a DOMAttr instance.
  • $isId: It specifies whether if you want name to be of type ID.
Return Value: This function returns nothing. Exceptions: This function throws DOM_NO_MODIFICATION_ALLOWED_ERR, if the node is readonly or DOM_NOT_FOUND, if name is not an attribute of this element. Below examples illustrate the DOMElement::setIdAttributeNode() function in PHP: Example 1: php
<?php

// Create a new DOM Document
$dom = new DOMDocument('1.0', 'iso-8859-1');
 
// Enable validate on parse
$dom->validateOnParse = true;
 
// Create a div element
$element = $dom->appendChild(new DOMElement
                  ('div', 'GEEKSFORGEEKS'));

// Create the id element 
$id = new DOMAttr('id', 'geeksforgeeks');

// Create a id attribute to div
$attr = $element->setAttributeNode($id);

// Set that attribute as id
$element->setIDAttributeNode($id, true);

echo $dom->saveXML();
?>
Output: Example 2: php
<?php

// Create a new DOM Document
$dom = new DOMDocument('1.0', 'iso-8859-1');
 
// Enable validate on parse
$dom->validateOnParse = true;
 
// Create a div element
$element = $dom->appendChild(new DOMElement
                 ('div', 'Hey ! This is my content.'));

// Create the id element 
$id = new DOMAttr('id', 'geeksforgeeks');

// Create a id attribute to div
$attr = $element->setAttributeNode($id);

// Set that attribute as id
$element->setIDAttributeNode($id, true);

// Get the text of element with id='geeksforgeeks'
// just to see if it works
$value = $dom->getElementById('geeksforgeeks')->textContent;
  
echo $value;
?>
Output:
Hey ! This is my content.
Reference: https://www.php.net/manual/en/domelement.setidattributenode.php

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