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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

说明

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

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

参数

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

返回值

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

参见

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

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User Contributed Notes 2 notes

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lewar ¶

16 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 ¶

13 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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