/reference/3.1/tutorials/RssReader/php/lastRSS.php

<?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 = 'UTF-8';
	var $CDATA = 'nochange';
	var $cp = '';
	var $items_limit = 0;
	var $stripHTML = False;
	var $date_format = '';

	// -------------------------------------------------------------------
	// 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 != '') {
					    $k = 'textinput_'.$textinputtag;
    					$result->$k = $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 != '') {
					    $k = 'image_'.$imagetag;
					    $result->$k = $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;
		}
	}
}

?>