RSS Feed - begrense antall nyheter

[K.Austheim]

Jeg har fått tak i et script (lastrss.webdot.cz) som parser rss, slik at jeg kan ha nyheter fra diverse nettsider samlet på en side. Spørsmålet mitt er om det er mulig å begrense antall nyheter som vises, ved å modifere scriptet litt. Selv, har jeg meget liten innsikt på dette området, da php er relativt nytt for meg, så er det noen som vet hvordan dette eventuelt kan gjøres?

 

 

lastRSS.php

<?php

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 UTF-8. mb_convert_encoding() to $out_charset
 	$utf = iconv($in_charset, 'UTF-8', $string);
 	mb_substitute_character($this->subs_char);
 	return mb_convert_encoding ($utf, $out_charset, 'UTF-8');
 } 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] = $temp; // Set only if not empty
   }
   // Strip HTML tags and other bullshit from DESCRIPTION (if description is presented)
   if ($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;
 }
}
}

?>

 

rss.php

<?
// 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 = 1200;

// Try to load and parse RSS file
if ($rs = $rss->get('http://feed.hardware.no/hardware_no_generell_datafeed.xml')) {

// Show last published articles (title, link, description)
foreach($rs['items'] as $item) {
echo "\t<a href=\"$item[link]\">".$item['title']."</a>".$item['description']."\n";

}

}
else {
echo "Error: It's not possible to reach RSS file...\n";
}
?>