Rss/Atomフィードの取得方法（改良版）

 
function escape($value, $enc = 'UTF-8') {
	if (is_array($value)) {
		return array_map('escape', $value);
	}
	return htmlspecialchars($value, ENT_QUOTES, $enc);
}
 
function checkLink($link) {
	return filter_var($link, FILTER_VALIDATE_URL) ? $link : null;
}
 
function outPutItem($title, $link, $content, $date) {
	$dt = new DateTime($date);
	$time = $dt->format('Y/m/d H:i:s');
	$content = strip_tags($content);
	$content = mb_strimwidth($content, 0, 150, '・・・', 'UTF-8');
	printf('<dl><dt><a href="%s" target="_blank">%s</a>（%s）</dt>', checkLink($link), escape($title), $time);
	printf('<dd>%s</dd></dl>', $content);
}
 
function getRss($url, $maxsize = 5) {
 
	try {
		$rss = new SimpleXMLElement($url, null, true);
 
		$i = 0;
		if (isset($rss->channel->title)) {
			$site_name = $rss->channel->title;
			$site_url  = $rss->channel->link;
		} else {
			$site_name = $rss->title;
			$site_url  = $rss->link['href'];
		}
		printf('<h2><a href="%s" target="_blank">%s</a></h2>',  $site_url, $site_name);
 
		switch (strtolower($rss->getName())) {
			case 'rdf': // rss1.0
			foreach ($rss->item as $item) {
				if($i >= $maxsize){
					break;
				} else {
					$i++;
					$title   = $item->title;
					$link    = $item->link;
					$content = $item->description;
					$date    = $item->children('http://purl.org/dc/elements/1.1/')->date;
					outPutItem($title, $link, $content, $date);
				}
			}
			break;
			case 'rss': // rss2.0
			foreach ($rss->channel->item as $item) {
				if($i >= $maxsize){
					break;
				} else {
					$i++;
					$title   = $item->title;
					$link    = $item->link;
					$content = $item->description;
					$date    = $item->pubDate;
					outPutItem($title, $link, $content, $date);
				}
			}
			break;
			case 'feed': // atom
			foreach ($rss->entry as $entry) {
				if($i >= $maxsize){
					break;
				} else {
					$i++;
					if (isset($entry->issued)) {
						$date = $entry->issued;
					} else {
						$date = $entry->published;
					}
 
					$title   = $entry->title;
					$link    = $entry->link['href'];
					$content = $entry->content;
					outPutItem($title, $link, $content, $date);
				}
			}
			break;
		}
	} catch (Exception $e) {
		echo $e->getMessage();
	}
}
?>

<?php
$rss_urls = array(
	"http://news.atode.cc/rss.php",
	"http://gigazine.net/news/rss_2.0/",
	"http://feeds.feedburner.com/phpspot/ccuf",
	"http://getnews.jp/feed/ext/orig",
	"http://rss.rssad.jp/rss/oshietekun/atom.xml",
	"https://php-fan.org/feed"
);
 
foreach ($rss_urls as $url) {
	getRss($url);
}
 
?>