PHP RSS reader

The PHP RSS reader class can be used to display the latest news from your favorite websites via RSS feeds. "RSS is a family of web feed formats used to publish frequently updated digital content, such as blogs, news feeds or podcasts. Users of RSS content use programs called feed 'readers' or 'aggregators': the user 'subscribes' to a feed by supplying to their reader a link to the feed; the reader can then check the user's subscribed feeds to see if any of those feeds have new content since the last time it checked, and if so, retrieve that content and present it to the user." The class:

// classe feedReader
//faz a leitura de um feed (rss ou xml)
//versão 2 para PHP 4
//autor: José Valente mailto:jcvalente@netvisao.pt
//2004 Portugal

class feedReader{

var $feedReader;   // parser
var $feedUrl;      // url do ficheiro xml/rss
var $node;         // número de nós dos items
var $channelFlag;  // flag
var $currentTag;   // actual tag
var $outputData;   // array dos dados (notícias formatadas)
var $itemFlag;     // flag
var $imageFlag;    // flag
var $feedVersion;  // versão do ficheiro rss

function feedReader(){ //constructor iniciação dos valores por defeitos dos elementos da classe
	$this->feedReader="";
	$this->feedUrl="";
	$this->node=0;
	$this->channelFlag=false;
	$this->currentTag="";
	$this->outputData=array();
	$this->itemFlag=false;
	$this->imageFlag=false;
	$this->feedVersion="";
}

function setFeedUrl($url){ //indicamos o endereço do ficheiro xml/rss
	$this->feedUrl=$url;
}

function getFeedOutputData(){ //retornamos o array com as notícias formatadas
	return $this->outputData;
}

function getFeedNumberOfNodes(){ //retornamos o número de notícias
	return $this->node;
}

function parseFeed(){ //função parse do xml
	$this->feedReader=xml_parser_create();
	xml_set_object($this->feedReader,$this);
	xml_parser_set_option($this->feedReader,XML_OPTION_CASE_FOLDING,true);
	xml_set_element_handler($this->feedReader,"openTag","closeTag");
	xml_set_character_data_handler($this->feedReader,"dataHandling");
	if(!($fp=@fopen($this->feedUrl,"r"))){
		$errorDefinition="Não foi possível encontrar o ficheiro pretendido.";
		echo $errorDefinition;
	}
	while($data=@fread($fp,4096)){
		//$data=utf8_encode($data);//para eliminar um erro, em que eliminava toda a string antes do último "&"
		if(!@xml_parse($this->feedReader,$data,feof($fp))){
			$errorDefinition=xml_error_string(xml_get_error_code($this->feedReader));
			echo $errorDefinition;
		}
	}
	xml_parser_free($this->feedReader);
}

function openTag(&$parser,&$name,&$attribs){ //função startElement
		if($name){
			switch(strtolower($name)){
				case "channel":$this->channelFlag=true;break;
				case "image":$this->channelFlag=false;$this->imageFlag=true;break;
				case "item":$this->channelFlag=false;$this->imageFlag=false;$this->itemFlag=true;$this->node++;break;
				default:$this->currentTag=strtolower($name);break;
			}
		}
}

function closeTag(&$parser,&$name){ //função endElement
	$this->currentTag="";
}

function dataHandling(&$parser,&$data){ //função characterElement
	if($this->channelFlag){ //para a descrição do channel
		if(isset($this->outputData["channel"][$this->currentTag])){
			$this->outputData["channel"][$this->currentTag].=$data;
		}else{
			$this->outputData["channel"][$this->currentTag]=$data;
		}
		
	}
	if($this->itemFlag){ //para a descrição dos items
		if(isset($this->outputData["item"][$this->currentTag][$this->node-1])){
			$this->outputData["item"][$this->currentTag][$this->node-1].=$data;
		}else{
			$this->outputData["item"][$this->currentTag][$this->node-1]=$data;
		}
		//reconversão
	}
	if($this->imageFlag){ //para a descrição da imagem
		if(isset($this->outputData["image"][$this->currentTag])){
			$this->outputData["image"][$this->currentTag].=$data;
		}else{
			$this->outputData["image"][$this->currentTag]=$data;
		}
		
	}
}

}

Usage:

$ob=new feedReader();
$ob->setFeedUrl("webdevfeed.xml");
$ob->parseFeed();
$array=$ob->getFeedOutputData();
$number=$ob->getFeedNumberOfNodes();
echo "-- Channel --<br>";
echo $array["channel"]["title"]."<br>";
echo $array["channel"]["link"]."<br>";
echo $array["channel"]["description"]."<br>";
echo $array["channel"]["language"]."<br>";
echo $array["channel"]["copyright"]."<br>";
echo $array["channel"]["docs"]."<br>";
echo "<br>-- image --<br>";
echo $array["image"]["title"]."<br>";
echo $array["image"]["url"]."<br>";
echo $array["image"]["link"]."<br>";
echo "<br>-- items --<br>";
for($i=0;$i<$number;$i++){
	echo $array["item"]["title"][$i]."<br>";
	echo $array["item"]["link"][$i]."<br>";
	echo $array["item"]["description"][$i]."<br>";
	echo $array["item"]["author"][$i]."<br>";
	echo $array["item"]["pubdate"][$i]."<br>";
}

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