获取表单数据并将其写入XML文件

Question

I am trying to take form data (via _POST) and write it to a document using SimpleXML. This is what I have tried and I can't seem to get it to work.

<?php
$title = $_POST['title'];
$link = $_POST['link'];
$description = $_POST['description'];

$rss = new SimpleXMLElement($xmlstr);
$rss->loadfile("feed.xml");

$item = $rss->channel->addChild('item');
$item->addChild('title', $title);
$item->addChild('link', $link);
$item->addChild('description', $description);

echo $rss->asXML();

header("Location: /success.html"); 

  exit;
?>

Any help or a point in the right direction would be much appreciated.

Answer 1

You use the asXML() function wrong. If you want to write your XML to a file, you must pass a filename parameter to it. Check the SimpleXMLElement::asXML manual

so your code line oututing xml should be changed from

echo $rss->asXML();

to

$rss->asXML('myNewlyCreatedXML.xml');