this article has more info : http://www.sitepoint.com/parsing-xml-with-simplexml/
(PHP 5 >= 5.1.2, PHP 7, PHP 8)
SimpleXMLElement::getNamespaces — Returns namespaces used in document
$recursive = false
) : arrayReturns namespaces used in document
recursiveIf specified, returns all namespaces used in parent and child nodes. Otherwise, returns only namespaces used in root node.
The getNamespaces method returns an array of
namespace names with their associated URIs.
Example #1 Get document namespaces in use
<?php
$xml = <<<XML
<?xml version="1.0" standalone="yes"?>
<people xmlns:p="http://example.org/ns" xmlns:t="http://example.org/test">
<p:person id="1">John Doe</p:person>
<p:person id="2">Susie Q. Public</p:person>
</people>
XML;
$sxe = new SimpleXMLElement($xml);
$namespaces = $sxe->getNamespaces(true);
var_dump($namespaces);
?>
以上例程会输出：
array(1) {
["p"]=>
string(21) "http://example.org/ns"
}
this article has more info : http://www.sitepoint.com/parsing-xml-with-simplexml/
If the namespace is nested in the xml, then you will have to loop over the nodes.
<?php
$xml = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<people xmlns:p="http://example.org/ns" xmlns:t="http://example.org/test">
<items>
<title>This is a test of namespaces and my patience</title>
<p:person id="1">John Doe</p:person>
<p:person id="2">Susie Q. Public</p:person>
<p:person id="1">Fish Man</p:person>
</items>
</people>
XML;
$sxe = new SimpleXMLElement($xml);
foreach ($sxe as $out_ns)
{
$ns = $out_ns->getNamespaces(true);
$child = $out_ns->children($ns['p']);
foreach ($child as $out)
{
echo $out . "<br />";
}
}
?>
To read a namespace node you have to use the children method.
<?php
$xml = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<people xmlns:p="http://example.org/ns" xmlns:t="http://example.org/test">
<p:person id="1">John Doe</p:person>
<p:person id="2">Susie Q. Public</p:person>
</people>
XML;
$sxe = new SimpleXMLElement($xml);
$ns = $sxe->getNamespaces(true);
$child = $sxe->children($ns['p']);
foreach ($child->person as $out_ns)
{
echo $out_ns;
}
?>