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DOMNode::isSupported	DOMNode::lookupPrefix

DOMNode	Last updated: Mon, 26 Oct 2026

DOMNode::lookupNamespaceURI

(PHP 5, PHP 7, PHP 8)

DOMNode::lookupNamespaceURI — Gets the namespace URI of the node based on the prefix

Description

public function DOMNode::lookupNamespaceURI(?string $prefix): ?string

Gets the namespace URI of the node based on the prefix.

Parameters

prefix: The prefix to look for. If this parameter is null, the method will return the default namespace URI, if any.

Return Values

Returns the associated namespace URI or null if none is found.

See Also

DOMNode::lookupPrefix() - Gets the namespace prefix of the node based on the namespace URI

DOMNode::isSupported	DOMNode::lookupPrefix

DOMNode	Last updated: Mon, 26 Oct 2026