PHP Invalid argument supplied for foreach() when getting RSS - php

Question

I seem to be having trouble accessing a portion of an RSS feed. I have read this article: Accessing date as XML node in PHP and Problem getting author from a wordpress RSS feed using SimpleXmlElement article but I still cannot seem to get this to work.
<item>
<title>This is the title</title>
<dc:creator>!an (#myHandle)</dc:creator>
<description><![CDATA[<p class="TweetTextSize js-tweet-text tweet-text" lang="en">What is this tweeet</p>]]></description>
<pubDate>Tue, 03 Jan 2017 22:01:54 +0000</pubDate>
<guid>1234567</guid>
<link>1234567</link>
<twitter:source/>
<twitter:place/>
</item>
here is the portion of the rss I am getting. Here is the full RSS: https://twitrss.me/twitter_search_to_rss/?term=test+this+feed
I am trying to access this with PHP code like so:
$feed = new DOMDocument();
$feed->load('https://twitrss.me/twitter_search_to_rss/?term=test+this+feed');
foreach ($feed->getElementsByTagName('channel')->item(0) as $item) {
$ns_dc = $item->children('http://purl.org/dc/elements/1.1/');
echo $ns_dc->creator;
}
but I keep getting this error:
Invalid argument supplied for foreach()
I have tried changing it to:
$feed->getElementsByTagName('channel')->item(0)
but then nothing outputs.
I also tried:
$feed->getElementsByTagName('channel')
but then get the error:
Call to undefined method DOMElement::children()
Question
Please can someone tell me, using PHP how to access the dc:creator tag and assign that value to a variable?
Edit
$i = 1;
foreach ($feed->channel as $row) {
echo $i;
foreach ($row->children() as $key => $val) {
if ($key == "item") {
if ($i == 1) {
$ns_dc = $val->children('http://purl.org/dc/elements/1.1/');
echo $ns_dc->creator;
}
}
}
$i = $i + 1;
}

Answer 1

Since you are dealing with XML content, I found it easier to use SimpleXML instead of DOMDocument. Since each <item> is in the same block as channel you can do a foreach looking for a key of item.
$feed = simplexml_load_file('https://twitrss.me/twitter_search_to_rss/?term=test+this+feed');
foreach ($feed->channel as $row) {
foreach ($row->children() as $key => $val) {
if ($key == "item") {
$ns_dc = $val->children('http://purl.org/dc/elements/1.1/');
echo $ns_dc->creator;
}
}
}
This code outputs the "creator" string you expect.