(PHP 5 >= 5.1.2, PHP 7, PHP 8)
SimpleXMLElement::getDocNamespaces — Returns namespaces declared in document
$recursive = false, bool $fromRoot = true): array|falseReturns namespaces declared in document
recursiveIf specified, returns all namespaces declared in parent and child nodes. Otherwise, returns only namespaces declared in root node.
fromRootAllows you to recursively check namespaces under a child node instead of from the root of the XML doc.
The getDocNamespaces method returns an array
of namespace names with their associated URIs.
示例 #1 Get document namespaces
<?php
$xml = <<<XML
<?xml version="1.0" standalone="yes"?>
<people xmlns:p="http://example.org/ns">
<p:person id="1">John Doe</p:person>
<p:person id="2">Susie Q. Public</p:person>
</people>
XML;
$sxe = new SimpleXMLElement($xml);
$namespaces = $sxe->getDocNamespaces();
var_dump($namespaces);
?>以上示例会输出：
array(1) {
["p"]=>
string(21) "http://example.org/ns"
}
示例 #2 Working with multiple namespaces
<?php
$xml = <<<XML
<?xml version="1.0" standalone="yes"?>
<people xmlns:p="http://example.org/ns" xmlns:t="http://example.org/test">
<p:person t:id="1">John Doe</p:person>
<p:person t:id="2" a:addr="123 Street" xmlns:a="http://example.org/addr">
Susie Q. Public
</p:person>
</people>
XML;
$sxe = new SimpleXMLElement($xml);
$namespaces = $sxe->getDocNamespaces(TRUE);
var_dump($namespaces);
?>以上示例会输出：
array(3) {
["p"]=>
string(21) "http://example.org/ns"
["t"]=>
string(23) "http://example.org/test"
["a"]=>
string(23) "http://example.org/addr"
}