Delete all elements of a certain type from an XML doc using PHP

问题

I have what should be an easy task: delete <places> nodes and their descendants from an XML document, leaving other nodes.

I tried this code, but it did not work ...

$document->preserveWhiteSpace = false; 
$books = $xpath->query('piletilve_info/places');
//echo "4";

foreach ($books as $places) {
    while($places->hasChildNodes()) {
        $places->removeChild($places->childNodes->item(0));
    }

    $places->parentNode->removeChild($places);
}

Source XML to be processed:

<piletilve_info>
   <places>
      <place>
        ...
      </place>
   </places>
   <other node>
      ...
   </other node>
</piletilve_info>

In the actual data there are more nodes that aren't places, but for simplicity this example shows only a few.

I saw C# examples, but I do not manage to port code to PHP.

Clarification : in code snippet, the variable $books is just a holder for the queried list. The name has no meaning.

回答1:

Goal is to delete whole node leaving other nodes ( in actual there are more, but for simplicity this example shows all

$dom = new DOMDocument;
$dom->load('places.xml');
foreach ($dom->getElementsByTagName('places') as $places)
{
    $places->parentNode->removeChild($places);
}
echo $dom->saveXml();

will remove all <places> elements anywhere in the document, including any children.

Output:

<?xml version="1.0"?>
<piletilve_info>

   <other>
      ...
   </other>
</piletilve_info>

回答2:

When I was using the accepted answer it wouldn't remove all occurrences of the tag. The foreach loop would skip over tags probably because foreach relies on the internal array pointer and changing it within the loop leads to unexpected behavior.

A working solution that I've found looks like this.

$dom = new DOMDocument;
$dom->load('places.xml');
$placesNodes = $dom->getElementsByTagName('places') 
while ($placesNodes->length > 0) {
    $node = $placesNodes->item(0);
    $node->parentNode->removeChild($node);
}
echo $dom->saveXml();

来源：https://stackoverflow.com/questions/4177376/delete-all-elements-of-a-certain-type-from-an-xml-doc-using-php

标签

php

xml

recursion

nodes