php生成RSS订阅简单示例

人气：424 时间：2020-07-28
这篇文章主要为大家详细介绍了php生成RSS订阅简单示例，具有一定的参考价值，可以用来参考一下。
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/**
 * 
 * @param 
 * @arrange (512.笔记) www.q1010.com
 **/
define("TIME_ZONE","");
define("FEEDCREATOR_VERSION", "www.q1010.com");//您的网址
class FeedItem extends HtmlDescribable {
	var $title, $description, $link;
	var $author, $authorEmail, $image, $category, $comments, $guid, $source, $creator;
	var $date;
	var $additionalElements = Array();
}



class FeedImage extends HtmlDescribable {
	var $title, $url, $link;
	var $width, $height, $description;
}



class HtmlDescribable {
	var $descriptionHtmlSyndicated;
	var $descriptionTruncSize;

	function getDescription() {
		$descriptionField = new FeedHtmlField($this->description);
		$descriptionField->syndicateHtml = $this->descriptionHtmlSyndicated;
		$descriptionField->truncSize = $this->descriptionTruncSize;
		return $descriptionField->output();
	}

}


class FeedHtmlField {
	var $rawFieldContent;
	var $truncSize, $syndicateHtml;
	function FeedHtmlField($parFieldContent) {
		if ($parFieldContent) {
			$this->rawFieldContent = $parFieldContent;
		}
	}
	function output() {
		if (!$this->rawFieldContent) {
			$result = "";
		}    elseif ($this->syndicateHtml) {
			$result = "<![CDATA[".$this->rawFieldContent."]]>";
		} else {
			if ($this->truncSize and is_int($this->truncSize)) {
				$result = FeedCreator::iTrunc(htmlspecialchars($this->rawFieldContent),$this->truncSize);
			} else {
				$result = htmlspecialchars($this->rawFieldContent);
			}
		}
		return $result;
	}

}


class UniversalFeedCreator extends FeedCreator {
	var $_feed;

	function _setFormat($format) {
		switch (strtoupper($format)) {

			case "2.0":
				// fall through
			case "RSS2.0":
				$this->_feed = new RSSCreator20();
				break;

			case "0.91":
				// fall through
			case "RSS0.91":
				$this->_feed = new RSSCreator091();
				break;

			default:
				$this->_feed = new RSSCreator091();
				break;
		}

		$vars = get_object_vars($this);
		foreach ($vars as $key => $value) {
			// prevent overwriting of properties "contentType", "encoding"; do not copy "_feed" itself
			if (!in_array($key, array("_feed", "contentType", "encoding"))) {
				$this->_feed->{$key} = $this->{$key};
			}
		}
	}

	function createFeed($format = "RSS0.91") {
		$this->_setFormat($format);
		return $this->_feed->createFeed();
	}


	function saveFeed($format="RSS0.91", $filename="", $displayContents=true) {
		$this->_setFormat($format);
		$this->_feed->saveFeed($filename, $displayContents);
	}


	function useCached($format="RSS0.91", $filename="", $timeout=3600) {
		$this->_setFormat($format);
		$this->_feed->useCached($filename, $timeout);
	}

}


class FeedCreator extends HtmlDescribable {
	var $title, $description, $link;
	var $syndicationURL, $image, $language, $copyright, $pubDate, $lastBuildDate, $editor, $editorEmail, $webmaster, $category, $docs, $ttl, $rating, $skipHours, $skipDays;
	var $xslStyleSheet = "";
	var $items = Array();
	var $contentType = "application/xml";
	var $encoding = "gb2312";
	var $additionalElements = Array();

	function addItem($item) {
		$this->items[] = $item;
	}

	function clearItem2Null() {
		$this->items = array();
	}


	function iTrunc($string, $length) {
		if (strlen($string)<=$length) {
			return $string;
		}

		$pos = strrpos($string,".");
		if ($pos>=$length-4) {
			$string = substr($string,0,$length-4);
			$pos = strrpos($string,".");
		}
		if ($pos>=$length*0.4) {
			return substr($string,0,$pos+1)." ...";
		}

		$pos = strrpos($string," ");
		if ($pos>=$length-4) {
			$string = substr($string,0,$length-4);
			$pos = strrpos($string," ");
		}
		if ($pos>=$length*0.4) {
			return substr($string,0,$pos)." ...";
		}

		return substr($string,0,$length-4)." ...";

	}


	function _createGeneratorComment() {
		return "<!-- generator=\"".FEEDCREATOR_VERSION."\" -->\n";
	}

	function _createAdditionalElements($elements, $indentString="") {
		$ae = "";
		if (is_array($elements)) {
			foreach($elements AS $key => $value) {
				$ae.= $indentString."<$key>$value</$key>\n";
			}
		}
		return $ae;
	}

	function _createStylesheetReferences() {
		$xml = "";
		if ($this->cssStyleSheet) $xml .= "xml-stylesheet href=\"".$this->cssStyleSheet."\" type=\"text/css\"\n";
		if ($this->xslStyleSheet) $xml .= "xml-stylesheet href=\"".$this->xslStyleSheet."\" type=\"text/xsl\"\n";
		return $xml;
	}

	function createFeed() {
	}


	function _generateFilename() {
		$fileInfo = pathinfo($_SERVER["PHP_SELF"]);
		return substr($fileInfo["basename"],0,-(strlen($fileInfo["extension"])+1)).".xml";
	}



	function _redirect($filename) {

		Header("Content-Type: ".$this->contentType."; charset=".$this->encoding."; filename=".basename($filename));
		Header("Content-Disposition: inline; filename=".basename($filename));
		readfile($filename, "r");
		die();
	}


	function useCached($filename="", $timeout=3600) {
		$this->_timeout = $timeout;
		if ($filename=="") {
			$filename = $this->_generateFilename();
		}
		if (file_exists($filename) AND (time()-filemtime($filename) < $timeout)) {
			$this->_redirect($filename);
		}
	}



	function saveFeed($filename="", $displayContents=true) {
		if ($filename=="") {
			$filename = $this->_generateFilename();
		}
		$feedFile = fopen($filename, "w+");
		if ($feedFile) {
			fputs($feedFile,$this->createFeed());
			fclose($feedFile);
			if ($displayContents) {
				$this->_redirect($filename);
			}
		} else {
			echo "<br /><b>Error creating feed file, please check write permissions.</b><br />";
		}
	}

}



class FeedDate {
	var $unix;
	function FeedDate($dateString="") {
		if ($dateString=="") $dateString = date("r");

		if (is_integer($dateString)) {
			$this->unix = $dateString;
			return;
		}
		if (preg_match("~(?:(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun),\\s+)?(\\d{1,2})\\s+([a-zA-Z]{3})\\s+(\\d{4})\\s+(\\d{2}):(\\d{2}):(\\d{2})\\s+(.*)~",$dateString,$matches)) {
			$months = Array("Jan"=>1,"Feb"=>2,"Mar"=>3,"Apr"=>4,"May"=>5,"Jun"=>6,"Jul"=>7,"Aug"=>8,"Sep"=>9,"Oct"=>10,"Nov"=>11,"Dec"=>12);
			$this->unix = mktime($matches[4],$matches[5],$matches[6],$months[$matches[2]],$matches[1],$matches[3]);
			if (substr($matches[7],0,1)=='+' OR substr($matches[7],0,1)=='-') {
				$tzOffset = (substr($matches[7],0,3) * 60 + substr($matches[7],-2)) * 60;
			} else {
				if (strlen($matches[7])==1) {
					$oneHour = 3600;
					$ord = ord($matches[7]);
					if ($ord < ord("M")) {
						$tzOffset = (ord("A") - $ord - 1) * $oneHour;
					} elseif ($ord >= ord("M") AND $matches[7]!="Z") {
						$tzOffset = ($ord - ord("M")) * $oneHour;
					} elseif ($matches[7]=="Z") {
						$tzOffset = 0;
					}
				}
				switch ($matches[7]) {
					case "UT":
					case "GMT":    $tzOffset = 0;
				}
			}
			$this->unix += $tzOffset;
			return;
		}
		if (preg_match("~(\\d{4})-(\\d{2})-(\\d{2})T(\\d{2}):(\\d{2}):(\\d{2})(.*)~",$dateString,$matches)) {
			$this->unix = mktime($matches[4],$matches[5],$matches[6],$matches[2],$matches[3],$matches[1]);
			if (substr($matches[7],0,1)=='+' OR substr($matches[7],0,1)=='-') {
				$tzOffset = (substr($matches[7],0,3) * 60 + substr($matches[7],-2)) * 60;
			} else {
				if ($matches[7]=="Z") {
					$tzOffset = 0;
				}
			}
			$this->unix += $tzOffset;
			return;
		}
		$this->unix = 0;
	}


	function rfc822() {
		$date = gmdate("Y-m-d H:i:s", $this->unix);
		if (TIME_ZONE!="") $date .= " ".str_replace(":","",TIME_ZONE);
		return $date;
	}


	function iso8601() {
		$date = gmdate("Y-m-d H:i:s",$this->unix);
		$date = substr($date,0,22) . ':' . substr($date,-2);
		if (TIME_ZONE!="") $date = str_replace("+00:00",TIME_ZONE,$date);
		return $date;
	}

	function unix() {
		return $this->unix;
	}
}



class RSSCreator10 extends FeedCreator {
	function createFeed() {
		$feed = "xml version=\"1.0\" encoding=\"".$this->encoding."\"\n";
		$feed.= $this->_createGeneratorComment();
		if ($this->cssStyleSheet=="") {
			$cssStyleSheet = "http://www.w3.org/2000/08/w3c-synd/style.css";
		}
		$feed.= $this->_createStylesheetReferences();
		$feed.= "<rdf:RDF\n";
		$feed.= "    xmlns=\"http://purl.org/rss/1.0/\"\n";
		$feed.= "    xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"\n";
		$feed.= "    xmlns:slash=\"http://purl.org/rss/1.0/modules/slash/\"\n";
		$feed.= "    xmlns:dc=\"http://purl.org/dc/elements/1.1/\">\n";
		$feed.= "    <channel rdf:about=\"".$this->syndicationURL."\">\n";
		$feed.= "        <title>".htmlspecialchars($this->title)."</title>\n";
		$feed.= "        <description>".htmlspecialchars($this->description)."</description>\n";
		$feed.= "        <link>".$this->link."</link>\n";
		if ($this->image!=null) {
			$feed.= "        <image rdf:resource=\"".$this->image->url."\" />\n";
		}
		$now = new FeedDate();
		$feed.= "       <dc:date>".htmlspecialchars($now->iso8601())."</dc:date>\n";
		$feed.= "        <items>\n";
		$feed.= "            <rdf:Seq>\n";
		for ($i=0;$i<count($this->items);$i++) {
			$feed.= "                <rdf:li rdf:resource=\"".htmlspecialchars($this->items[$i]->link)."\"/>\n";
		}
		$feed.= "            </rdf:Seq>\n";
		$feed.= "        </items>\n";
		$feed.= "    </channel>\n";
		if ($this->image!=null) {
			$feed.= "    <image rdf:about=\"".$this->image->url."\">\n";
			$feed.= "        <title>".$this->image->title."</title>\n";
			$feed.= "        <link>".$this->image->link."</link>\n";
			$feed.= "        <url>".$this->image->url."</url>\n";
			$feed.= "    </image>\n";
		}
		$feed.= $this->_createAdditionalElements($this->additionalElements, "    ");

		for ($i=0;$i<count($this->items);$i++) {
			$feed.= "    <item rdf:about=\"".htmlspecialchars($this->items[$i]->link)."\">\n";
			//$feed.= "        <dc:type>Posting</dc:type>\n";
			$feed.= "        <dc:format>text/html</dc:format>\n";
			if ($this->items[$i]->date!=null) {
				$itemDate = new FeedDate($this->items[$i]->date);
				$feed.= "        <dc:date>".htmlspecialchars($itemDate->iso8601())."</dc:date>\n";
			}
			if ($this->items[$i]->source!="") {
				$feed.= "        <dc:source>".htmlspecialchars($this->items[$i]->source)."</dc:source>\n";
			}
			if ($this->items[$i]->author!="") {
				$feed.= "        <dc:creator>".htmlspecialchars($this->items[$i]->author)."</dc:creator>\n";
			}
			$feed.= "        <title>".htmlspecialchars(strip_tags(strtr($this->items[$i]->title,"\n\r","  ")))."</title>\n";
			$feed.= "        <link>".htmlspecialchars($this->items[$i]->link)."</link>\n";
			$feed.= "        <description>".htmlspecialchars($this->items[$i]->description)."</description>\n";
			$feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements, "        ");
			$feed.= "    </item>\n";
		}
		$feed.= "</rdf:RDF>\n";
		return $feed;
	}
}



class RSSCreator091 extends FeedCreator {
	var $RSSVersion;

	function RSSCreator091() {
		$this->_setRSSVersion("0.91");
		$this->contentType = "application/rss+xml";
	}


	function _setRSSVersion($version) {
		$this->RSSVersion = $version;
	}


	function createFeed() {
		$feed = "xml version=\"1.0\" encoding=\"".$this->encoding."\"\n";
		$feed.= $this->_createGeneratorComment();
		$feed.= $this->_createStylesheetReferences();
		$feed.= "<rss version=\"".$this->RSSVersion."\">\n";
		$feed.= "    <channel>\n";
		$feed.= "        <title>".FeedCreator::iTrunc(htmlspecialchars($this->title),100)."</title>\n";
		$this->descriptionTruncSize = 500;
		$feed.= "        <description>".$this->getDescription()."</description>\n";
		$feed.= "        <link>".$this->link."</link>\n";
		$now = new FeedDate();
		$feed.= "        <lastBuildDate>".htmlspecialchars($now->rfc822())."</lastBuildDate>\n";
		$feed.= "        <generator>".FEEDCREATOR_VERSION."</generator>\n";

		if ($this->image!=null) {
			$feed.= "        <image>\n";
			$feed.= "            <url>".$this->image->url."</url>\n";
			$feed.= "            <title>".FeedCreator::iTrunc(htmlspecialchars($this->image->title),100)."</title>\n";
			$feed.= "            <link>".$this->image->link."</link>\n";
			if ($this->image->width!="") {
				$feed.= "            <width>".$this->image->width."</width>\n";
			}
			if ($this->image->height!="") {
				$feed.= "            <height>".$this->image->height."</height>\n";
			}
			if ($this->image->description!="") {
				$feed.= "            <description>".$this->image->getDescription()."</description>\n";
			}
			$feed.= "        </image>\n";
		}
		if ($this->language!="") {
			$feed.= "        <language>".$this->language."</language>\n";
		}
		if ($this->copyright!="") {
			$feed.= "        <copyright>".FeedCreator::iTrunc(htmlspecialchars($this->copyright),100)."</copyright>\n";
		}
		if ($this->editor!="") {
			$feed.= "        <managingEditor>".FeedCreator::iTrunc(htmlspecialchars($this->editor),100)."</managingEditor>\n";
		}
		if ($this->webmaster!="") {
			$feed.= "        <webMaster>".FeedCreator::iTrunc(htmlspecialchars($this->webmaster),100)."</webMaster>\n";
		}
		if ($this->pubDate!="") {
			$pubDate = new FeedDate($this->pubDate);
			$feed.= "        <pubDate>".htmlspecialchars($pubDate->rfc822())."</pubDate>\n";
		}
		if ($this->category!="") {
			$feed.= "        <category>".htmlspecialchars($this->category)."</category>\n";
		}
		if ($this->docs!="") {
			$feed.= "        <docs>".FeedCreator::iTrunc(htmlspecialchars($this->docs),500)."</docs>\n";
		}
		if ($this->ttl!="") {
			$feed.= "        <ttl>".htmlspecialchars($this->ttl)."</ttl>\n";
		}
		if ($this->rating!="") {
			$feed.= "        <rating>".FeedCreator::iTrunc(htmlspecialchars($this->rating),500)."</rating>\n";
		}
		if ($this->skipHours!="") {
			$feed.= "        <skipHours>".htmlspecialchars($this->skipHours)."</skipHours>\n";
		}
		if ($this->skipDays!="") {
			$feed.= "        <skipDays>".htmlspecialchars($this->skipDays)."</skipDays>\n";
		}
		$feed.= $this->_createAdditionalElements($this->additionalElements, "    ");

		for ($i=0;$i<count($this->items);$i++) {
			$feed.= "        <item>\n";
			$feed.= "            <title>".FeedCreator::iTrunc(htmlspecialchars(strip_tags($this->items[$i]->title)),100)."</title>\n";
			$feed.= "            <link>".htmlspecialchars($this->items[$i]->link)."</link>\n";
			$feed.= "            <description>".$this->items[$i]->getDescription()."</description>\n";

			if ($this->items[$i]->author!="") {
				$feed.= "            <author>".htmlspecialchars($this->items[$i]->author)."</author>\n";
			}
			/*
			 // on hold
			 if ($this->items[$i]->source!="") {
			 $feed.= "            <source>".htmlspecialchars($this->items[$i]->source)."</source>\n";
			 }
			 */
			if ($this->items[$i]->category!="") {
				$feed.= "            <category>".htmlspecialchars($this->items[$i]->category)."</category>\n";
			}
			if ($this->items[$i]->comments!="") {
				$feed.= "            <comments>".htmlspecialchars($this->items[$i]->comments)."</comments>\n";
			}
			if ($this->items[$i]->date!="") {
				$itemDate = new FeedDate($this->items[$i]->date);
				$feed.= "            <pubDate>".htmlspecialchars($itemDate->rfc822())."</pubDate>\n";
			}
			if ($this->items[$i]->guid!="") {
				$feed.= "            <guid>".htmlspecialchars($this->items[$i]->guid)."</guid>\n";
			}
			$feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements, "        ");
			$feed.= "        </item>\n";
		}
		$feed.= "    </channel>\n";
		$feed.= "</rss>\n";
		return $feed;
	}
}


class RSSCreator20 extends RSSCreator091 {

	function RSSCreator20() {
		parent::_setRSSVersion("2.0");
	}

}

/** 应用实例
 *require("lib/rss_class.php");
 *require("lib/conn.php");

 *$db=db_connect();
 *$brs=mysql_query('select * from zhaobiao order by subdate desc limit 0,100',$db);

 *$rss = new UniversalFeedCreator();
 *$rss->title = "页面标题";
 *$rss->link = "网址http://";
 *$rss->description = "rss标题";

 *while($rowbrs=mysql_fetch_array($brs)){
 *$item = new FeedItem();
 *$item->title =$rowbrs['title'];
 *$item->link = 'http://网址/文件?参数='.$rowbrs['id']);
 *$item->description =$rowbrs['mess'];
 *$rss->addItem($item);
 *}
 *db_close();
 *$rss->saveFeed("RSS2.0", "rss.xml");
 **/
本文来自：http://www.q1010.com/173/10907-0.html
注：关于php生成RSS订阅简单示例的内容就先介绍到这里，更多相关文章的可以留意四海网的其他信息。
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