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DOMElement::replaceWith	DOMElement::setAttributeNode

DOMElement	Last updated: Mon, 26 Oct 2026

DOMElement::setAttribute

(PHP 5, PHP 7, PHP 8)

DOMElement::setAttribute — Adds new or modifies existing attribute

Description

public function DOMElement::setAttribute(string $qualifiedName, string $value): DOMAttr|bool

Sets an attribute with name qualifiedName to the given value. If the attribute does not exist, it will be created.

Parameters

qualifiedName: The name of the attribute.
value: The value of the attribute.

Return Values

The created or modified DOMAttr or false if an error occurred.

Errors/Exceptions

May throw a DOMException with the following error codes:

DOM_NO_MODIFICATION_ALLOWED_ERR: Raised if the node is readonly.

Examples

Example #1 Setting an attribute

<?php
$doc = new DOMDocument("1.0");
$node = $doc->createElement("para");
$newnode = $doc->appendChild($node);
$newnode->setAttribute("align", "left");
?>

See Also

DOMElement::hasAttribute() - Checks to see if attribute exists
DOMElement::getAttribute() - Returns value of attribute
DOMElement::removeAttribute() - Removes attribute

DOMElement::replaceWith	DOMElement::setAttributeNode

DOMElement	Last updated: Mon, 26 Oct 2026