Remove multiple empty nodes with SimpleXML

问题

I want to delete all the empty nodes in my XML document using SimpleXML

Here is my code :

$xs = file_get_contents('liens.xml')or die("Fichier XML non chargé");
$doc_xml = new SimpleXMLElement($xs);
foreach($doc_xml->xpath('//*[not(text())]') as $torm)
    unset($torm);   
$doc_xml->asXML("liens.xml");

I saw with a print_r() that XPath is grabbing something, but nothing is removed from my XML file.

回答1:

I know this post is a bit old but in your foreach, $torm is replaced in every iteration. This means your unset($torm) is doing nothing to the original $doc_xml object.

Instead you will need to remove the element itself:

foreach($doc_xml->xpath('//*[not(text())]') as $torm)
    unset($torm[0]);
               ###

by using a simplxmlelement-self-reference.

回答2:

$file  = 'liens.xml';
$xpath = '//*[not(text())]';

if (!$xml = simplexml_load_file($file)) {
    throw new Exception("Fichier XML non chargé");
}

foreach ($xml->xpath($xpath) as $remove) {
    unset($remove[0]);
}

$xml->asXML($file);

来源：https://stackoverflow.com/questions/5559551/remove-multiple-empty-nodes-with-simplexml