root/trunk/common/rssparser.php

<?php
class RSSParser {

    var $saveItems = array(
        "title"       => "string",
        "link"        => "string",
        "description" => "string",
        "dc:creator"  => "string",
        "dc:date"     => "date",
        "dc:subject"  => "string",
    );

    /**
     * Read and parse a RSS feed which $url points at (may be an URL or local file)
     * @param $url string containing the URL to the RSS feed. May be an URL or local file
     */
    function RSSParser($rssdata) {
        $this->rssData = $rssdata;
        $this->readItems();

    }

    /**
     * Construct a new empty RSS item
     * @return a new empty assoc. array representing an rss item
     */
    function newItem() {
        $retItem = array();

        foreach(array_keys($this->saveItems) as $key) {
            $retItem[$key] = "";
        }

        return($retItem);
    }

    /**
     * Read <item> segments from the RSS file and stuff them in an array.
     */
    function readItems() {
        if (!isset($this->rssData)) {
            return(-1);
        }

        $this->rssItems = array();

        $parser = xml_parser_create();

        xml_parser_set_option($parser,XML_OPTION_CASE_FOLDING,0);
        xml_parser_set_option($parser,XML_OPTION_SKIP_WHITE,1);

        xml_parse_into_struct($parser,$this->rssData,$values,$tags);
        xml_parser_free($parser);

        // Loop through all the elements in the RSS XML file.  If an <item> tag
        // is found, it's children will be added to a array until the closing
        // tag is found. Then the array is added to a list of items
        // ($this->rssItems).
        for ($i=1; $i < count($values); $i++) {

            $tagName = "";
            $tagType = "";
            $tagValue = "";

            if (array_key_exists("tag", $values[$i])) {
                $tagName = $values[$i]["tag"];
            }
            if (array_key_exists("type", $values[$i])) {
                $tagType = $values[$i]["type"];
            }
            if (array_key_exists("value", $values[$i])) {
                $tagValue = $values[$i]["value"];
            }

            if ($values[$i]["tag"] == "item" && $values[$i]["type"] == "open") {
                // Looks like we found an <item> tag. Create a new array to
                // store it's children values as they will be found on the next
                // iteration of the loop.
                $rssItem = $this->newItem();
            }
            if ($values[$i]["tag"] == "item" && $values[$i]["type"] == "close" && isset($rssItem)) {
                // </item> tag closed. Store the read item information.
                $this->rssItems[] = $rssItem;
                unset($rssItem); // No item information will be saved when this doesn't exist.
            }

            if (array_key_exists($tagName, $this->saveItems) && isset($rssItem)) {
                // Found a tag that we want to store and that's part of an
                // <item>. Save it.
                switch($this->saveItems[$tagName]) {
                    case "string":
                        $rssItem[$tagName] = $tagValue;
                        break;
                    case "date":
                        $rssItem[$tagName] = strtotime($tagValue);
                        break;
                    default:
                        print("Don't know how to handle type ".$this->saveItems[$tagName].". Aborting.");
                        exit(1);
                        break;
                }
            }
        }

    }
}
?>