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  1. Passing an empty string doesn't work - even though the documentation says that lookupNamespaceURI takes a string as argument (and null would just be converted to an empty string).

  2. Mar 2, 2020 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more.

  3. DOMNode::lookupNamespaceUri — Gets the namespace URI of the node based on the prefix

  4. Simple usage example of `DOMNode::lookupNamespaceURI ()`. The PHP function `DOMNode::lookupNamespaceURI` is used to retrieve the namespace URI of a node by specifying its associated prefix.

  5. Mar 17, 2026 · DOMNode::lookupNamespaceURI — Gets the namespace URI of the node based on the prefix DOMNode::lookupPrefix — Gets the namespace prefix of the node based on the namespace URI

  6. (No version information available, might be only in CVS) DOMNode::lookupNamespaceURI — Gets the namespace URI of the node based on the prefix

  7. The method lookupNamespaceURI gets the URI of the namespace associated with the namespace prefix, starting from current node. Following is the syntax for the usage of the lookupNamespaceURI method.