echo "Echo: ".$rssResultLink;
$output = $modx->getChunk('myChunk',array(
'myRssLink' => $rssResultLink
));
return $output;$modx->setPlaceholder('myRssLink',$rssResultLink);
. Though, seems kind of weird to first declare the variable placholder, then declare the same exact variable when you use getChunk. This is what worked:
//Assign the data
$modx->setPlaceholder('rssUrl',$xml->channel->item[$i]->link);
$modx->setPlaceholder('rssTitle',$truncTitle);
$modx->setPlaceholder('rssTitleHover',$xml->channel->item[$i]->title);
//Output it via the chunk
$output .= $modx->getChunk('rssListResults',array(
'rssUrl' => $xml->channel->item[$i]->link,
'rssTitle' => $truncTitle,
'rssTitleHover' => $xml->channel->item[$i]->title
));
}
return $output;

$fields = array(
'rssUrl' => $xml->channel->item[$i]->link,
'rssTitle' => $truncTitle,
'rssTitleHover' => $xml->channel->item[$i]->title
));
$modx->toPlaceholders($fields);
$output .= $modx->getChunk('rssListResults');
return $output;
.
$fields = array(
'rssUrl' => $xml->channel->item[$i]->link,
'rssTitle' => $truncTitle,
'rssTitleHover' => $xml->channel->item[$i]->title
);
$modx->toPlaceholders($fields);
$output .= $modx->getChunk('rssListResults');
$fields = array(
'rssUrl' => (string)$xml->channel->item[$i]->link,
'rssTitle' => $truncTitle,
'rssTitleHover' => (string)$xml->channel->item[$i]->title
);
$modx->toPlaceholders($fields);
$output .= $modx->getChunk('rssListResults');
$data = array(
'rssUrl' => (string)$xml->channel->item[$i]->link,
'rssTitle' => $truncTitle,
'rssTitleHover' => (string)$xml->channel->item[$i]->title,
);
$output .= $modx->getChunk('rssListResults',$data);