<?xml version="1.0"?>
<root>
<map>
<operationallayers>
<layer label="Security" type="feature" visible="false" useproxy="true" usePopUp="all" url="https://stackoverflow.com"/>
</operationallayers>
</map>
</root>
我有这段XML(string2):
<operationallayers>
<layer label="Teste1" type="feature" visible="false" useproxy="true" usePopUp="all" url="https://stackoverflow.com"/>
<layer label="Teste2" type="dynamic" visible="false" useproxy="true" usePopUp="all" url="http://google.com"/>
</operationallayers>
我使用函数simplexml_load_string将两者都导入到各自的var:
$xml1 = simplexml_load_string($string1);
$xml2 = simplexml_load_string($string2);
现在,我想为string2的节点’operationslayers’替换string1的节点’operationallayers’,但是如何?
SimpleXMLElement类没有像DOM那样的方法’replaceChild’.
解决方法:
与SimpleXML: append one tree to another中概述的类似,您可以将这些节点导入DOMDocument,因为在您编写时:
“The class SimpleXMLElement dont have a method ‘replaceChild’ like the DOM.”
因此,当您导入DOM时,您可以使用以下内容:
$xml1 = simplexml_load_string($string1);
$xml2 = simplexml_load_string($string2);
$domtochange = dom_import_simplexml($xml1->map->operationallayers);
$domreplace = dom_import_simplexml($xml2);
$nodeImport = $domtochange->ownerDocument->importNode($domreplace, TRUE);
$domtochange->parentNode->replaceChild($nodeImport, $domtochange);
echo $xml1->asXML();
这给你以下输出(非美化):
<?xml version="1.0"?>
<root>
<map>
<operationallayers>
<layer label="Teste1" type="feature" visible="false" useproxy="true" usePopUp="all" url="https://stackoverflow.com"/>
<layer label="Teste2" type="dynamic" visible="false" useproxy="true" usePopUp="all" url="http://google.com"/>
</operationallayers>
</map>
</root>
此外,您可以将此操作添加到SimpleXMLElement中,以便轻松包装.这通过从SimpleXMLElement扩展来工作:
/**
* Class MySimpleXMLElement
*/
class MySimpleXMLElement extends SimpleXMLElement
{
/**
* @param SimpleXMLElement $element
*/
public function replace(SimpleXMLElement $element) {
$dom = dom_import_simplexml($this);
$import = $dom->ownerDocument->importNode(
dom_import_simplexml($element),
TRUE
);
$dom->parentNode->replaceChild($import, $dom);
}
}
用法示例:
$xml1 = simplexml_load_string($string1, 'MySimpleXMLElement');
$xml2 = simplexml_load_string($string2);
$xml1->map->operationallayers->replace($xml2);
相关:In SimpleXML, how can I add an existing SimpleXMLElement as a child element?.
上次我在Stackoverflow上扩展SimpleXMLElement是在answer to the “Read and take value of XML attributes” question.