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Curl php script to grab nodes fails

Last Modified: 2012-05-11
Following cURL Xpath script found on web -http://www.devdevote.com/server-script/php/get-xml-data-with-xpath-curl - I want to use as a base for grabbing H1s fails with undefined variable on line 30. Why?
function get_url($url)
     $curl = curl_init();
     curl_setopt($curl, CURLOPT_HEADER, 0);
     curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
     curl_setopt($curl, CURLOPT_URL, $url);
     $data = curl_exec($curl);
     return $data;

function get_url_data()
     $xml_content = get_url("http://wordpress.org/development/feed/");
     $dom = new DOMDocument();
     $xpath = new DomXPath($dom);
     $content_title = $xpath->query('//channel//title/text()');
     return $content_title;

function print_url_data()
     $content = get_url_data();
     foreach ($content as $value)
          $output .= $value->nodeValue . "<br />";
     return $output;

echo print_url_data();

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