Why use RSS-Feed?

<?php
$rdffile = "http://openpr.com/rss.php";
$content = implode ("", file ($rdffile));
preg_match_all("/(.*)<\/item>/Uis",$content, $items);
for ($i=0;$i < count($items[1]);$i++)
{
  	$pat = "/<title>(.*)<\/title>.*(.*)<\/description>.*(.*)<\/link>";
	preg_match_all("/".$pat."/Uis", $items[1][$i], $regs);
	echo "<a href='".$regs[3][0]."'>".$regs[1][0]."</a><br><br>".$regs[2][0];
}						
?>