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RSS PHP question

Posted: Thu Jun 10, 2004 12:45 pm
by Hajduk
Ok, after studying the RSS file a bit I finally created a syndication on my site from another site. Happy joy. But, it creates a long list instead of e.g. only 10 headlines that I want....

How can I fix this. If anyone can point me out what I need to put in for code I would be very happy.

ok so here are the codes I use for the 2 files.

Mypage:

Code: Select all

<?php
/* 
 ======================================================================
 lastRSS usage DEMO 2
 ----------------------------------------------------------------------
 This example shows, how to
 	- create lastRSS object
	- set transparent cache
	- get RSS file from URL
	- access and show fields of the result
 ======================================================================
*/

// include lastRSS
include "./lastRSS.php";

// Create lastRSS object
$rss = new lastRSS;

// Set cache dir and cache time limit (1200 seconds)
// (don't forget to chmod cahce dir to 777 to allow writing)
$rss->cache_dir = './temp';
$rss->cache_time = 3600;


// Try to load and parse RSS file
if ($rs = $rss->get('http://www.b92.net/news/rss/vesti-naslovi.php')) {
	/// Show website logo (if presented)
	//if ($rs[image_url] != '') {
		//echo "<a href="$rs[image_link]"><img src="$rs[image_url]" alt="$rs[image_title]" vspace="1" border="0" /></a><br />\n";
		//}
	/// Show clickable website title
	//echo "<big><b><a href="$rs[link]">$rs[title]</a></b></big><br />\n";
	/// Show website description
	//echo "$rs[description]<br />\n";
	/// Show last published articles (title, link, description)
	echo "<ul>\n";
	foreach($rs['items'] as $item) {
		echo "\t<li><a href="$item[link]">".$item['title']."</a><br />".$item['description']."</li>\n";
		}
	echo "</ul>\n";
	}
else {
	echo "Error: It's not possible to reach RSS file...\n";
}
?>
The parser file I have

lastrss:

Code: Select all

<?php
/* 
 ======================================================================
 lastRSS 0.6
 
 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/

 ----------------------------------------------------------------------
 TODO
 - Iconv nedavat na cely, ale jen na TITLE a DESCRIPTION (u item i celkove)
 ----------------------------------------------------------------------
 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
 ======================================================================
*/

class lastRSS {
	// -------------------------------------------------------------------
	// Settings
	// -------------------------------------------------------------------
	var $channeltags = array ('title', 'link', 'description', 'language', 'copyright', 'managingEditor', 'webMaster', 'pubDate', '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, $subject) {
		preg_match($pattern, $subject, $out);
		return trim($out[1]);
	}

	// -------------------------------------------------------------------
	// Replace HTML entities &something; by real characters
	// -------------------------------------------------------------------
	function unhtmlentities ($string) {
		$trans_tbl = get_html_translation_table (HTML_ENTITIES);
		$trans_tbl = array_flip ($trans_tbl);
		return strtr ($string, $trans_tbl);
	}

	// -------------------------------------------------------------------
	// Encoding conversion functiuon
	// -------------------------------------------------------------------
	function MyConvertEncoding($in_charset, $out_charset, $string) {
		// if substitute_character
		if ($this->subs_char) {
			// Iconv() to windows-1250. mb_convert_encoding() to $out_charset
			$utf = iconv($in_charset, 'windows-1250', $string);
			mb_substitute_character($this->subs_char);
			return mb_convert_encoding ($utf, $out_charset, 'windows-1250');
		} else {
			// Iconv() to $out_charset
			return iconv($in_charset, $out_charset, $string);
		}
	}

	// -------------------------------------------------------------------
	// 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 code page is set convert character encoding to required
				if ($this->cp != '')
					$rss_content = $this->MyConvertEncoding($result['encoding'], $this->cp, $rss_content);

			// 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
				
			}

			// Parse TEXTINPUT info
			preg_match("'<textinput(|[^>]*[^/])>(.*?)</textinput>'si", $rss_content, $out_textinfo);
				// This a little strange regexp means:
				// Look for tag <textinput> with or without any attributes, but skip truncated version <textinput /> (it's not beggining tag)
			if ($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, $out_imageinfo);
			if ($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];
			$result['items_count'] = count($items[1]);
			$i = 0;
			$result['items'] = array(); // create array even if there are no items
			foreach($rss_items as $rss_item) {
				// Parse one item
				foreach($this->itemtags as $itemtag)
				{
					$temp = $this->my_preg_match("'<$itemtag.*?>(.*?)</$itemtag>'si", $rss_item);
					if ($temp != '') $result[items][$i][$itemtag] = $temp; // Set only if not empty
				}
				// Strip HTML tags and other <span style='color:blue' title='I&#39;m naughty, are you naughty?'>smurf</span> from DESCRIPTION (if description is presented)
				if ($result['items'][$i]['description'])
					$result['items'][$i]['description'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['description'])));
				// Item counter
				$i++;
			}
			return $result;
		}
		else // Error in opening return False
		{
			return False;
		}
	}
}

?>
If anyone can tell, thanks a million!!!!

edit: patrikG added

Code: Select all

-tags for readabililty

Posted: Thu Jun 10, 2004 4:00 pm
by Hajduk
A yes, now I see. Anyways, I am still kinda in the dark :-(

Posted: Thu Jun 10, 2004 5:44 pm
by dull1554

Code: Select all

<?php
/*
======================================================================
lastRSS usage DEMO 2
----------------------------------------------------------------------
This example shows, how to
   - create lastRSS object
   - set transparent cache
   - get RSS file from URL
   - access and show fields of the result
======================================================================
*/

// include lastRSS
include "./lastRSS.php";

// Create lastRSS object
$rss = new lastRSS;

// Set cache dir and cache time limit (1200 seconds)
// (don't forget to chmod cahce dir to 777 to allow writing)
$rss->cache_dir = './temp';
$rss->cache_time = 3600;


// Try to load and parse RSS file
if ($rs = $rss->get('http://www.b92.net/news/rss/vesti-naslovi.php')) {
   /// Show website logo (if presented)
   //if ($rs[image_url] != '') {
      //echo "<a href="$rs[image_link]"><img src="$rs[image_url]" alt="$rs[image_title]" vspace="1" border="0" /></a><br />\n";
      //}
   /// Show clickable website title
   //echo "<big><b><a href="$rs[link]">$rs[title]</a></b></big><br />\n";
   /// Show website description
   //echo "$rs[description]<br />\n";
   /// Show last published articles (title, link, description)
   echo "<ul>\n";
for($i=10;$i>0;$i--){//$i being the number of lines you want to return
   foreach($rs['items'] as $item) {
      echo "\t<li><a href="$item[link]">".$item['title']."</a><br />".$item['description']."</li>\n";
      }
}
   echo "</ul>\n";
   }
else {
   echo "Error: It's not possible to reach RSS file...\n";
}
?>
it should work, not sure have not tested but it cant hurt give it a go.....
hope this helps

Posted: Fri Jun 11, 2004 2:30 am
by Hajduk
Hi,

Thanks but it doesnt, It gives the same article over and over.

Posted: Fri Jun 11, 2004 3:27 am
by patrikG
Basically, what you're looking for is an iterator (for..next, while, foreach etc) in the existing code.
Where you want to have a limit of 10, there is currently none.
Have you tried doing it yourself? It's very straightforward.

Posted: Fri Jun 11, 2004 3:30 am
by Hajduk
patrikG wrote:Basically, what you're looking for is an iterator (for..next, while, foreach etc) in the existing code.
Where you want to have a limit of 10, there is currently none.
Have you tried doing it yourself? It's very straightforward.
Yes I tried to do it myself. I dont have manuals in my language which is kinda nasty.

Posted: Fri Jun 11, 2004 4:04 am
by patrikG
For the php manual, click on the second link in below, for info on RSS, use google.

Posted: Fri Jun 11, 2004 4:43 am
by Hajduk
As said its not my own language, maybe I am not getting clear, but isnt this a support forum for develops??
If you dont want to help me just say it.

Posted: Fri Jun 11, 2004 4:51 am
by JayBird
Hajduk wrote:As said its not my own language, maybe I am not getting clear, but isnt this a support forum for develops??
If you dont want to help me just say it.
Try here for more languages, surely you must speak one of them - http://www.php.net/docs.php

This is a support forum for people that have tried and can't get something to work. You haven't shown us anything you have tried to resolve the issue you are having.

We are here to help, not do the work for you remember.

Read the manual, have a go yurself, and then when your stuck, we can help.

You'll never learn if we do it for you.

Mark

Posted: Fri Jun 11, 2004 4:52 am
by patrikG
This is a forum for php developers and everyone is here to help. But what I am trying to do is to point you towards the problem you are having so that you can solve it yourself. In short: a learning experience.

I don't know what your mothertongue is, but the PHP manual is available in over 25 languages. If you look up iterator functions in the manual, you should be able to solve this very quickly yourself.

Posted: Fri Jun 11, 2004 5:48 am
by Hajduk

Code: Select all

<?php
$num_items = 10;
$items = array_slice($rss->items, 0, $num_items);


foreach ($rss->items as $item ) {
	$title = $item[title];
	$url   = $item[link];
	echo "<a href=$url>$title</a></li><br>\n";
?>
Tried that tried this, been busy for 2 days. I dont understand programmer language. But ok, I will read the manual and find out myself.

Posted: Fri Jun 11, 2004 5:54 am
by patrikG
Basically, you have an array ($rss->items) and want to loop through it, stopping after the 10th iteration. In your code you have foreach(...) which does not naturally lend itself for a n-iteration.
If would be easier if you used for(...){}
You will need to look up on what [php_man]array[/php_man]s are, what a key of an array is, as well as for-next loop.