假設(shè)你的xml為stu.xml
---------------那么--------------
$doc = new DOMDocument();
$doc->load( 'stu.xml' );
$students = $doc->getElementsByTagName( "xuesheng" );
foreach($students as $stu){
$yuwen = $stu->getElementsByTagName( "yuwen" )->item(0)->nodeValue;
$shuxue = $stu->getElementsByTagName( "shuxue" )->item(0)->nodeValue;
$yingyu = $stu->getElementsByTagName( "yingyu" )->item(0)->nodeValue;
$zongfen = $stu->getElementsByTagName( "zongfen" )->item(0)->nodeValue;
if($zongfen){
echo "節(jié)點(diǎn)已經(jīng)存在了，不再添加!";
continue;
}
$zongfen = $yuwen+$shuxue+$yingyu;
$newNode = $doc->createElement("zongfen",$zongfen);
$stu->appendChild($newNode);
}
echo $result = $doc->saveXML();
file_put_contents("stu.xml",$result); //這句其實(shí)是不需要加上的- - 但是我也不曉得為什么save不了，就加了這句~

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