Question

PHP is not my world so, I need some help to update a xml file.
It’s my first time with DOM and seems to not replace the element.

Here’s my XML:

<?xml version="1.0" encoding="utf-8"?>
<feedback>
  <feed id="0">
    <title>some title</title>
    <desc><![CDATA[some text]]></desc>
  </feed>
  <feed id="1">
    <title>some title</title>
    <desc><![CDATA[some text]]></desc>
  </feed>
  <feed id="2">
    <title>some title</title>
    <desc><![CDATA[some text]]></desc>
  </feed>
</feedback>

And PHP code:

<?php

    if ($_POST['agg']) {

        $selid = $_POST['selectedfeed'];
        $newtitolo = $_POST['title'];
        $newdesc = nl2br($_POST['feed']);

        $file = "feedback.xml";
        $fp = fopen($file, "rb") or die("cannot open file");
        $str = fread($fp, filesize($file));

    $xml = new DOMDocument();
    $xml->formatOutput = true;
    $xml->preserveWhiteSpace = false;
    $xml->loadXML($str) or die("Error");    

    $root = $xml->documentElement;

    $oldfeed = $root->getElementsByTagName("feed")->item($selid);

    $title = $xml->createElement("title");
    $titleText = $xml->createTextNode($newtitle);
    $title->appendChild($titleText);

    $desc = $xml->createElement("desc");
    $descText = $xml->createCDATAsection($newdesc);
    $desc->appendChild($descText);

    $feed = $xml->createElement("feed");
    $feed->appendChild($title);
    $feed->appendChild($desc);

    $root->replaceChild($feed,$oldfeed);

    $xml->saveXML("feedback.xml");
    }
?>

For the code above, I need to get a “feed” node with a specific ID and replace the feed’s content with the new created elements “title” and “desc” (cdata).

How can I do this?

Answer 1

Almost every thing in your code is Ok.
Just change:

 $xml->saveXML("feedback.xml");

to

 $xml->save("feedback.xml");