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<?php
/*
======================================================================
lastRSS 0.9.1

Simple yet powerfull PHP class to parse RSS files.

by Vojtech Semecky, webmaster @ webdot . cz

Latest version, features, manual and examples:
http://lastrss.webdot.cz/

----------------------------------------------------------------------
LICENSE

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License (GPL)
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

To read the license please visit http://www.gnu.org/copyleft/gpl.html
======================================================================
*/

/**
* lastRSS
* Simple yet powerfull PHP class to parse RSS files.
*/
class lastRSS {
// -------------------------------------------------------------------
// Public properties
// -------------------------------------------------------------------
var $default_cp = 'windows-1254';
var $CDATA = 'nochange';
var $cp = '';
var $items_limit = 0;
var $stripHTML = False;
var $date_format = 'd M Y D - G:i';

// -------------------------------------------------------------------
// Private variables
// -------------------------------------------------------------------
var $channeltags = array ('title', 'link', 'description', 'language', 'copyright', 'managingEditor', 'webMaster', 'lastBuildDate', 'rating', 'docs');
var $itemtags = array('title', 'link', 'description', 'author', 'category', 'comments', 'enclosure', 'guid', 'pubDate', 'source');
var $imagetags = array('title', 'url', 'link', 'width', 'height');
var $textinputtags = array('title', 'description', 'name', 'link');

// -------------------------------------------------------------------
// Parse RSS file and returns associative array.
// -------------------------------------------------------------------
function Get ($rss_url) {
// If CACHE ENABLED
if ($this->cache_dir != '') {
$cache_file = $this->cache_dir . '/rsscache_' . md5($rss_url);
$timedif = @(time() - filemtime($cache_file));
if ($timedif < $this->cache_time) {
// cached file is fresh enough, return cached array
$result = unserialize(join('', file($cache_file)));
// set 'cached' to 1 only if cached file is correct
if ($result) $result['cached'] = 1;
} else {
// cached file is too old, create new
$result = $this->Parse($rss_url);
$serialized = serialize($result);
if ($f = @fopen($cache_file, 'w')) {
fwrite ($f, $serialized, strlen($serialized));
fclose($f);
}
if ($result) $result['cached'] = 0;
}
}
// If CACHE DISABLED >> load and parse the file directly
else {
$result = $this->Parse($rss_url);
if ($result) $result['cached'] = 0;
}
// return result
return $result;
}

// -------------------------------------------------------------------
// Modification of preg_match(); return trimed field with index 1
// from 'classic' preg_match() array output
// -------------------------------------------------------------------
function my_preg_match ($pattern, $subject) {
// start regullar expression
preg_match($pattern, $subject, $out);

// if there is some result... process it and return it
if(isset($out[1])) {
// Process CDATA (if present)
if ($this->CDATA == 'content') { // Get CDATA content (without CDATA tag)
$out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
} elseif ($this->CDATA == 'strip') { // Strip CDATA
$out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
}

// If code page is set convert character encoding to required
if ($this->cp != '')
//$out[1] = $this->MyConvertEncoding($this->rsscp, $this->cp, $out[1]);
$out[1] = iconv($this->rsscp, $this->cp.'//TRANSLIT', $out[1]);
// Return result
return trim($out[1]);
} else {
// if there is NO result, return empty string
return '';
}
}

// -------------------------------------------------------------------
// Replace HTML entities &something; by real characters
// -------------------------------------------------------------------
function unhtmlentities ($string) {
// Get HTML entities table
$trans_tbl = get_html_translation_table (HTML_ENTITIES, ENT_QUOTES);
// Flip keys<==>values
$trans_tbl = array_flip ($trans_tbl);
// Add support for &apos; entity (missing in HTML_ENTITIES)
$trans_tbl += array('&apos;' => "'");
// Replace entities by values
return strtr ($string, $trans_tbl);
}

// -------------------------------------------------------------------
// Parse() is private method used by Get() to load and parse RSS file.
// Don't use Parse() in your scripts - use Get($rss_file) instead.
// -------------------------------------------------------------------
function Parse ($rss_url) {
// Open and load RSS file
if ($f = @fopen($rss_url, 'r')) {
$rss_content = '';
while (!feof($f)) {
$rss_content .= fgets($f, 4096);
}
fclose($f);

// Parse document encoding
$result['encoding'] = $this->my_preg_match("'encoding=[\'\"](.*?)[\'\"]'si", $rss_content);
// if document codepage is specified, use it
if ($result['encoding'] != '')
{ $this->rsscp = $result['encoding']; } // This is used in my_preg_match()
// otherwise use the default codepage
else
{ $this->rsscp = $this->default_cp; } // This is used in my_preg_match()

// Parse CHANNEL info
preg_match("'<channel.*?>(.*?)</channel>'si", $rss_content, $out_channel);
foreach($this->channeltags as $channeltag)
{
$temp = $this->my_preg_match("'<$channeltag.*?>(.*?)</$channeltag>'si", $out_channel[1]);
if ($temp != '') $result[$channeltag] = $temp; // Set only if not empty
}
// If date_format is specified and lastBuildDate is valid
if ($this->date_format != '' && ($timestamp = strtotime($result['lastBuildDate'])) !==-1) {
// convert lastBuildDate to specified date format
$result['lastBuildDate'] = date($this->date_format, $timestamp);
}

// Parse TEXTINPUT info
preg_match("'<textinput(|[^>]*[^/])>(.*?)</textinput>'si", $rss_content, $out_textinfo);
// This a little strange regexp means:
// Look for tag <textinput> with or without any attributes, but skip truncated version <textinput /> (it's not beggining tag)
if (isset($out_textinfo[2])) {
foreach($this->textinputtags as $textinputtag) {
$temp = $this->my_preg_match("'<$textinputtag.*?>(.*?)</$textinputtag>'si", $out_textinfo[2]);
if ($temp != '') $result['textinput_'.$textinputtag] = $temp; // Set only if not empty
}
}
// Parse IMAGE info
preg_match("'<image.*?>(.*?)</image>'si", $rss_content, $out_imageinfo);
if (isset($out_imageinfo[1])) {
foreach($this->imagetags as $imagetag) {
$temp = $this->my_preg_match("'<$imagetag.*?>(.*?)</$imagetag>'si", $out_imageinfo[1]);
if ($temp != '') $result['image_'.$imagetag] = $temp; // Set only if not empty
}
}
// Parse ITEMS
preg_match_all("'<item(| .*?)>(.*?)</item>'si", $rss_content, $items);
$rss_items = $items[2];
$i = 0;
$result['items'] = array(); // create array even if there are no items
foreach($rss_items as $rss_item) {
// If number of items is lower then limit: Parse one item
if ($i < $this->items_limit || $this->items_limit == 0) {
foreach($this->itemtags as $itemtag) {
$temp = $this->my_preg_match("'<$itemtag.*?>(.*?)</$itemtag>'si", $rss_item);
if ($temp != '') $result['items'][$i][$itemtag] = $temp; // Set only if not empty
}
// Strip HTML tags and other bullshit from DESCRIPTION
if ($this->stripHTML && $result['items'][$i]['description'])
$result['items'][$i]['description'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['description'])));
// Strip HTML tags and other bullshit from TITLE
if ($this->stripHTML && $result['items'][$i]['title'])
$result['items'][$i]['title'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['title'])));
// If date_format is specified and pubDate is valid
if ($this->date_format != '' && ($timestamp = strtotime($result['items'][$i]['pubDate'])) !==-1) {
// convert pubDate to specified date format
$result['items'][$i]['pubDate'] = date($this->date_format, $timestamp);
}
// Item counter
$i++;
}
}

$result['items_count'] = $i;
return $result;
}
else // Error in opening return False
{
return False;
}
}
}

?>

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