come usare php per filtrare gli elementi di un rss?

[whisher]

Ciao.

<?php 
class XmlLoader {
    public $doc = null;
    public function __construct() {
          $this->doc = new DOMDocument();
    }
    public function loadXmlFile($fileName) {
        if(!$this->doc->load($fileName)) {
            throw new Exception('Error loading file ['.$fileName.']');
        }
        return new XmlParser($this->doc);
    }
}
class XmlParser
{
    public $doc = null;
    public function __construct($doc) {
          $this->doc = $doc;
    }
    public function save($fileName) {
        if(!$this->doc->save($fileName)){
             throw new Exception('Error saving file ['.$fileName.']');
        }
    }
    //rss
    public function getDocumentElement()
    {
        return $this->doc->documentElement;
      }
    //item
    public function getItems()
    {
        return $this->getDocumentElement()->getElementsByTagName("item");
    }
}//
try{
    $doc = new XmlLoader();
    $docXmlParser = $doc->loadXmlFile('http://www.corriere.it/rss/homepage.xml');
    //get all items returns a DomNodeList    
    $elements = $docXmlParser->getItems();
    foreach($elements as $node) {
       print $node->textContent . "\n";
    }
}
catch(Exception $e){
    echo $e->getMessage();
    exit();
}
?>

Per esempio.