将发布的值保存到php中的xml

Question

<root>
  <gallery name="First"/>
  <gallery name="Second"/>
  <gallery name="Third"/>
</root>

I think I have solved part of a previous problem and now have the foreach loop correct? Still I can't get it to save the xml.

$objXML = new SimpleXMLElement(XML_FILE_NAME, null, true);  
foreach($objXML->xpath('/root/gallery/@name') as $key => $old){
    $new = $_POST['name'][$key];
    echo "$key : $old : $new<br />
";
    $old = $new; // this does nothing??
    }
$objXML->asXML(XML_FILE_NAME);

echo returns:
0 : First : First New
1 : Second : Second New
2 : Third : Third New

Why does this not save the new posted values for 'name' back to my XML doc, what am I doing wrong?

Answer 1

You're in a loop.

This mean each time the loop comes back to another point $key and $old get their respective new values.

I guess that's what you're trying to achieve (but I'm not you're sure I got your goal here)

foreach($objXML->xpath('/root/gallery/@name') as $key => $value){
    $new = $_POST['name'][$key];
    echo "$key : $old : $new<br />
";
    $old = $value;
}

---

From your comment :

You can test it here.

$objXML = new SimpleXMLElement(XML_FILE_NAME, null, true);  

$galleryLore = $objXML->gallery; // finding gallery
$i = 0;
foreach($galleryLore as $gallery){
  unset($gallery['name']); // We delete the old name
  $new = $_POST['name'][$i]; // We find the new name value
  $gallery->addAttribute('name', $new); // We add the new attribute we deleted before
  $i++;
}