如何使用SimpleXML的XPath支持设置文本内容？

Question

<xml> 
    <ns:foo attribute="bar"> 
     OLD TEXT DATA 
    </ns:foo> 
</xml> 

我使用XPath来处理XML名称空间。这是行不通的：

$xml->asXML('old.xml'); 

foreach ($xml->xpath('ns:foo') as $foo) { 
    $foo['attribute'] = 'new bar'; 
    $foo = 'NEW TEXT DATA'; //This won't be saved by asXML(). 
} 

$xml->asXML('new.xml'); 

我该如何更改文本内容SimpleXMLElement::xpath？

Answer 1

$xml->asXML('old.xml'); 

foreach ($xml->xpath('ns:foo') as $foo) { 
    $foo['attribute'] = 'new bar'; 
    $foo[0] = 'NEW TEXT DATA'; 
} 

$xml->asXML('new.xml');