PHP 正则表达式分析RSS

$xmlfile = 'news/'.date('YmdH').'.xml';
$sourcexml = 'http://www.chinanews.com.cn/rss/scroll-news.xml';
if( !file_exists($xmlfile) ) {
$str = @file($sourcexml) or die('加载文件时出错。');
$fp = fopen($xmlfile,'w') or die('写缓存失败!');
fputs($fp,$str);
fclose($fp);

$xml = simplexml_load_file($xmlfile);
$c = $xml->channel;
$k = 0;
foreach($c->item as $v) {
$k ++;
echo "
<div class=\"newsline\">·<a title=\"$v->title\" href=\"$v->link\" target=\"_blank\">$v->title</a></div>
";

$str = mb_convert_encoding( join('',$str), "gb2312", "GBK");

$fp = fopen($xmlfile,'r');
if($fp)
{
$data = fread($fp,filesize($xmlfile));
fclose($fp);
preg_match_all(
"/<item><title>(.*?)<\/title><link>(.*?)<\/link>/i",$data,$out,PREG_SET_ORDER);
foreach($out as $key => $v)
{
$v[1] = iconv('gbk','utf-8',$v[1]);
echo "
<div class=\"newsline\">·<a title=\"$v[1]\" href=\"$v[2]\" target=\"_blank\">$v[1]</a></div>
";
}
}