PHP文件无法正确显示（代码仅显示此文件）

Question

PHP正在显示所有其他php文件，但此文件是唯一的。它为nfl分数创建一个rss feed。当我查看它时，我看到的是代码。我相信我必须错过Apache2中的某个模块或其他什么，但我是空白的。任何帮助是极大的赞赏。下面是代码。此代码在我的个人hostgator Web服务器帐户上运行良好，这使我相信它是我的本地服务器上的apache2配置的问题。我在三个不同的apache2服务器上尝试了同样的问题。

<?
function get_content($url)
{
   $ch = curl_init();

   curl_setopt ($ch, CURLOPT_URL, $url);
   curl_setopt ($ch, CURLOPT_HEADER, 0);

   ob_start();

   curl_exec ($ch);
   curl_close ($ch);
   $string = ob_get_contents();

   ob_end_clean();

   return $string;
}

header("Content-Type: text/xml");
echo "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n\n";
echo "<!DOCTYPE rss PUBLIC \"-//Netscape Communications//DTD RSS 0.91//EN\"\n";
echo " \"http://my.netscape.com/publish/formats/rss-0.91.dtd\">\n\n";
echo "<rss version=\"0.91\">\n\n";
echo "<channel>\n";

echo "<title>NFL Scores</title>\n";
echo "<link>http://www.nfl.com/</link>\n";
echo "<description>NFL Scores</description>\n";
echo "<language>en-us</language>\n";
echo "<image>\n";
echo " <title>NFL Scores</title>\n";
echo " <url>http://www.mpiii.com/scores/nfl.gif</url>\n";
echo " <link>http://www.nfl.com</link>\n";
echo "</image>\n";
echo "<webMaster>info@nfl.com</webMaster>\n";

$content = get_content ("http://sports.espn.go.com/nfl/bottomline/scores");

$content_array=explode("&", $content);
$scorearray = array();
$i=0;
foreach($content_array as $content) {
        if (strpos($content, "_left")) {
                $equalpos = strpos($content, "=");
                $end = strlen($content);
                $title = substr($content, ($equalpos+1), $end);
                $title = str_replace("^", "", $title);
                $title = str_replace("%20", " ", $title);
                $title = ucwords(str_replace("END OF 4TH", "Final", $title));
                $title = str_replace('( ', '(', ucwords(str_replace('(', '( ', $title)));
                $title = str_replace("FINAL", "Final", $title);
                $scorearray[$i]["title"] = $title;

        }
        if (strpos($content, "_url")) {
                $equalpos = strpos($content, "=");
                $end = strlen($content);
                $url = substr($content, ($equalpos+1), $end);
                $url = str_replace("^", "", $url);
                $url = str_replace("%20", " ", $url);
                $scorearray[$i]["url"] = $url;
                                $i++;

        }
}
foreach($scorearray as $score) {
        echo "<item>\n";
        echo "<title>".$score["title"]."</title>\n";
        echo "<link>".$score["url"]."</link>\n";
        echo "</item>\n";
}

echo "</channel>\n";
echo "</rss>\n";
?>