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RSSParser.php

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<?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 {

var $feed_uri = NULL; // Feed URI

var $data = FALSE; // Associative array containing all the feed items

var $channel_data = array(); // Store RSS Channel Data in an array

var $feed_unavailable; // Boolean variable which indicates whether an RSS feed was unavailable

var $cache_life = 0; // Cache lifetime

var $cache_dir = './application/cache/'; // Cache directory

var $write_cache_flag = FALSE; // Flag to write to cache - defaulted to false

var $callback = FALSE; // Callback to read custom data

public $isSecure = FALSE;

function RSSParser($callback = FALSE)

{

if ($callback)

{

$this->callback = $callback;

}

$this->current_feed['title'] = '';

$this->current_feed['description'] = '';

$this->current_feed['link'] = '';

}

// --------------------------------------------------------------------

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->current_feed['title'] = '';

$this->current_feed['description'] = '';

$this->current_feed['link'] = '';

$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;

$data['description'] = (string)$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;

$data['description'] = (string)$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);

if($this->isSecure){

fwrite($fp, str_replace("http://", "https://", $rawFeed));

}

else{

fwrite($fp, $rawFeed);

}

flock($fp, LOCK_UN);

fclose($fp);

}

return TRUE;

}

// --------------------------------------------------------------------

function set_cache_life($period = NULL)

{

$this->cache_life = $period;

}

// --------------------------------------------------------------------

function set_feed_url($url = NULL)

{

$this->feed_uri = $url;

}

// --------------------------------------------------------------------

function set_secure_content($isSecure = FALSE)

{

$this->isSecure = $isSecure;

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)

{

if (!$this->data)

{

$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;

}

}

/* End of file RSSParser.php */

/* Location: ./application/libraries/RSSParser.php */