php生成RSS订阅解决办法
内容摘要
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。
对php生成RSS订阅简单示例对此感兴趣的朋友，看看idc笔记做的技术笔记！
/**
*
对php生成RSS订阅简单示例对此感兴趣的朋友，看看idc笔记做的技术笔记！
/**
*
文章正文
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。
对php生成RSS订阅简单示例对此感兴趣的朋友，看看idc笔记做的技术笔记！
/**
*
* @param
* @arrange （www.idcnote.com）
**/
define("TIME_ZONE","");
define("FEEDCREATOR_VERSION", "www.idcnote.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");
**/
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作者：喵哥笔记
