/application/libraries/Rssparser.php

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/*
 * This class is written based entirely on the work found below
 * www.techbytes.co.in/blogs/2006/01/15/consuming-rss-with-php-the-simple-way/
 * All credit should be given to the original author
 *
 * Example:
  $this->load->library('rssparser');
  $this->rssparser->set_feed_url('http://example.com/feed');
  $this->rssparser->set_cache_life(30);
  $rss = $this->rssparser->getFeed(6);  // Get six items from the feed
  // Using a callback function to parse addictional XML fields
  $this->load->library('rssparser', array($this, 'parseFile')); // parseFile method of current class
  function parseFile($data, $item)
  {
    $data['summary'] = (string)$item->summary;
    return $data;
  }
*/
class RSSParser {
  public $feed_uri      = NULL;           // Feed URI
  public $data        = FALSE;          // Associative array containing all the feed items
  public $channel_data    = array();          // Store RSS Channel Data in an array
  public $feed_unavailable  = NULL;           // Boolean variable which indicates whether an RSS feed was unavailable
  public $cache_life      = 0;            // Cache lifetime
  public $cache_dir       = './application/cache/';   // Cache directory
  public $write_cache_flag  = FALSE;          // Flag to write to cache
  public $callback      = FALSE;          // Callback to read custom data

  function __construct($callback = FALSE)
  {
    if ($callback)
    {
      $this->callback = $callback;
    }
  }
  // --------------------------------------------------------------------
  function parse()
  {
    // Are we caching?
    if ($this->cache_life != 0)
    {
      $filename = $this->cache_dir.'rss_Parse_'.md5($this->feed_uri);
      // Is there a cache file ?
      if (!file_exists($filename))
      {
        // Has it expired?
        $timedif = (time() - filemtime($filename));
        if ($timedif < ( $this->cache_life * 60))
        {
          $rawFeed = file_get_contents($filename);
        }
        else
        {
          // So raise the falg
          $this->write_cache_flag = true;
        }
      }
      else
      {
        // Raise the flag to write the cache
        $this->write_cache_flag = true;
      }
    }
    // Reset
    $this->data = array();
    $this->channel_data = array();
    // Parse the document
    if (!isset($rawFeed))
    {
      $rawFeed = file_get_contents($this->feed_uri);
    }
    $xml = new SimpleXmlElement($rawFeed);
    if ($xml->channel)
    {
      // Assign the channel data
      $this->channel_data['title'] = $xml->channel->title;
      $this->channel_data['description'] = $xml->channel->description;
      // Build the item array
      foreach ($xml->channel->item as $item)
      {
        $data = array();
        $data['title'] = (string)$item->title;
        $data['category'] = (string)$item->category;
        $data['description'] = (string)$item->description;
        $data['pubDate'] = (string)$item->pubDate;
        $data['link'] = (string)$item->link;
        $dc = $item->children('http://purl.org/dc/elements/1.1/');
        $data['author'] = (string)$dc->creator;

        if ($this->callback)
        {
          $data = call_user_func($this->callback, $data, $item);
        }

        $this->data[] = $data;
      }
    }
    else
    {
      // Assign the channel data
      $this->channel_data['title'] = $xml->title;
      $this->channel_data['description'] = $xml->subtitle;
      // Build the item array
      foreach ($xml->entry as $item)
      {
        $data = array();
        $data['id'] = (string)$item->id;
        $data['title'] = (string)$item->title;
        $data['category'] = (string)$item->category;
        $data['description'] = (string)$item->content;
        $data['pubDate'] = (string)$item->published;
        $data['link'] = (string)$item->link['href'];
        $dc = $item->children('http://purl.org/dc/elements/1.1/');
        $data['author'] = (string)$dc->creator;

        if ($this->callback)
        {
          $data = call_user_func($this->callback, $data, $item);
        }

        $this->data[] = $data;
      }
    }
    // Do we need to write the cache file?
    if ($this->write_cache_flag)
    {
      if (!$fp = @fopen($filename, 'wb'))
      {
        echo "RSSParser error";
        log_message('error', "Unable to write cache file: ".$filename);
        return;
      }
      flock($fp, LOCK_EX);
      fwrite($fp, $rawFeed);
      flock($fp, LOCK_UN);
      fclose($fp);
    }
    return TRUE;
  }
  // --------------------------------------------------------------------
  function set_cache_life($period = NULL)
  {
    $this->cache_life = $period;
    return $this;
  }
  // --------------------------------------------------------------------
  function set_feed_url($url = NULL)
  {
    $this->feed_uri = $url;
    return $this;
  }
  // --------------------------------------------------------------------
  /* Return the feeds one at a time: when there are no more feeds return false
   * @param No of items to return from the feed
   * @return Associative array of items
  */
  function getFeed($num)
  {
    $this->parse();

    $c = 0;
    $return = array();
    foreach ($this->data AS $item)
    {
      $return[] = $item;
      $c++;
      if ($c == $num)
      {
        break;
      }
    }
    return $return;
  }
  // --------------------------------------------------------------------
  /* Return channel data for the feed */
  function & getChannelData()
  {
    $flag = false;
    if (!empty($this->channel_data))
    {
      return $this->channel_data;
    }
    else
    {
      return $flag;
    }
  }
  // --------------------------------------------------------------------
  /* Were we unable to retreive the feeds ?  */
  function errorInResponse()
  {
    return $this->feed_unavailable;
  }
  // --------------------------------------------------------------------

  /* Initialize the feed data */
  function clear()
  {
    $this->feed_uri   = NULL;
    $this->data     = FALSE;
    $this->channel_data = array();
    $this->cache_life = 0;
    $this->callback   = FALSE;

    return $this;
  }

  function getFeedByDate($date)
  {

  }
}
/* End of file RSSParser.php */
/* Location: ./application/libraries/RSSParser.php */