PHP | DOMElement removeAttributeNode() Function

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The DOMElement::removeAttributeNode() function is an inbuilt function in PHP which is used to remove attribute from element.

Syntax:

bool DOMElement::removeAttributeNode( DOMAttr $oldnode )

Parameters: This function accepts a single parameter $oldnode which holds the attribute that to be removed.

Return Value: This function returns TRUE on success or FALSE on failure.

Exceptions: This function throws DOM_NO_MODIFICATION_ALLOWED_ERR, if the node is read-only and DOM_NOT_FOUND_ERROR if $oldnode is not a attribute of element.

Below given programs illustrate the DOMElement::removeAttributeNode() function in PHP:

Program 1:

<?php 
  
// Create a new DOMDocument 
$dom = new DOMDocument(); 
  
// Load the XML 
$dom->loadXML("<?xml version=\"1.0\"?> 
<root> 
    <html> 
        <h1 id=\"my_id\"> Geeksforzambiatek </h1> 
        <h2> Second heading </h2> 
    </html> 
</root>"); 
  
// Get the elements 
$node = $dom->getElementsByTagName('h1')[0]; 
  
echo "Before the removal of attributes: <br>"; 
  
// Get the attribute name and value 
$attribute = $node->attributes->item(0); 
$attribute_name = $attribute->name; 
$attribute_value = $attribute->value; 
  
echo $attribute_name . ' => '; 
echo $attribute_value; 
  
// Get the attribute to remove 
$oldnode = $node->getAttributeNode('id'); 
  
// Remove the id attribute 
$node->removeAttributeNode($oldnode); 
  
echo "<br>After the removal of attributes: <br>"; 
  
// Get the attribute name and value 
$attribute = $node->attributes->item(0); 
$attribute_name = $attribute->name . ' => '; 
$attribute_value = $attribute->value; 
echo $attribute_name; 
echo $attribute_value; 
?> 

Output:

Before the removal of attributes:
id => my_id
After the removal of attributes:
=>          // Empty string means attribute is removed

Program 2:

<?php 
  
// Create a new DOMDocument 
$dom = new DOMDocument(); 
  
// Load the XML 
$dom->loadXML("<?xml version=\"1.0\"?> 
<root> 
    <html> 
        <h1 id=\"my_id\" style=\"color:green;\"  
          class=\"my_class\"> Geeksforzambiatek </h1> 
        <h2> Second heading </h2> 
    </html> 
</root>"); 
  
// Get the elements 
$node = $dom->getElementsByTagName('h1')[0]; 
  
echo "Before the removal of attributes: <br>"; 
  
// Get the attribute to remove 
$oldnode = $node->getAttributeNode('id'); 
  
// Get the attribute count 
$attributeCount = $node->attributes->count(); 
echo 'No of attributes => ' . $attributeCount; 
  
// Remove the id attribute 
$node->removeAttributeNode($oldnode); 
  
echo "<br>After the removal of attributes: <br>"; 
  
// Get the attribute count 
$attributeCount = $node->attributes->count(); 
echo 'No of attributes => ' . $attributeCount; 
?> 

Output:

Before the removal of attributes:
No of attributes => 3
After the removal of attributes:
No of attributes => 2

Reference: https://www.php.net/manual/en/domelement.removeattributenode.php

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