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    DOMNode::lookupNamespaceURI

    (PHP 5, PHP 7, PHP 8)

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

    Description

    public 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

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    User Contributed Notes 2 notes

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    7
    lewar
    17 years ago
    Simple way to get the URI of the default namespace:

    <?php
        $document     = new DOMDocument();
            $document->load($xml_file);
            $uri = $document->documentElement->lookupnamespaceURI(NULL);
    ?>
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    -5
    _ michael
    14 years ago
    You have to pass *null* to lookupNamespaceURI if you want to read the default namespace. 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).
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