Display RSS Feed

[jonahpup]

Hi there,

 

I am wanting to use the existing code I have for displaying an RSS feed, however, I want to only display the last 3 items that were added to the feed on a particular page.  I have it working so that it will display every item in the rss file at present, but dont know how to only show the last 3 items... ie: itemid=4, itemid=5 and itemid=6.

 

here is my RSS xml code:

<?xml version = "1.0"?>
<!DOCTYPE rss PUBLIC "-//Netscape Communications//DTD RSS 0.91//EN" 
"http://my.netscape.com/publish/formats/rss-0.91.dtd">

<rss version="0.91">
<channel>
<title>MANZ Torque Newsletters</title>
<link>http://www.manz.org.nz</link>
<description></description>
<language>en-us</language>


<item>
<itemid>1</itemid>
<title>March 2007</title>
<link>http://www.domain.com/documents/March07.pdf</link>
<description>Description... 
</description>
</item>

<item>
<itemid>2</itemid>
<title>June 2007</title>
<link>http://www.domain.com/documents/June07.pdf</link>
<description>Description...
</description>
</item>

<item>
<itemid>3</itemid>
<title>September 2007</title>
<link>http://www.domain.com/documents/September07.pdf</link>
<description>This is the description for September 2007.
</description>
</item>

<item>
<itemid>4</itemid>
<title>October 2007</title>
<link>http://www.domain.com/documents/September07.pdf</link>
<description>This is the description for October 2007.
</description>
</item>

<item>
<itemid>5</itemid>
<title>November 2007</title>
<link>http://www.domain.com/documents/September07.pdf</link>
<description>This is the description for November 2007.
</description>
</item>

<item>
<itemid>6</itemid>
<title>December 2007</title>
<link>http://www.domain.com/documents/September07.pdf</link>
<description>This is the description for December 2007.
</description>
</item>

</channel>
</rss>

 

The code I am using to parse and display these items is:

<?php

class xItem {
  var $xTitle;
  var $xLink;
  var $xDescription;
}

// general vars
$sTitle = "";
$sLink = "";
$sDescription = "";
$arItems = array();
$itemCount = 0;

// ********* Start User-Defined Vars ************
// rss url goes here
$uFile = "http://www.domain.com/newsletters.rss";
// descriptions (true or false) goes here
$bDesc = true;
// font goes here
$uFont = "Verdana, Arial, Helvetica, sans-serif";
$uFontSize = "2";
// ********* End User-Defined Vars **************

function startElement($parser, $name, $attrs) {
  global $curTag;

  $curTag .= "^$name";

}

function endElement($parser, $name) {
  global $curTag;

  $caret_pos = strrpos($curTag,'^');

  $curTag = substr($curTag,0,$caret_pos);

}

function characterData($parser, $data) { global $curTag; // get the Channel information first
  global $sTitle, $sLink, $sDescription;  
  $titleKey = "^RSS^CHANNEL^TITLE";
  $linkKey = "^RSS^CHANNEL^LINK";
  $descKey = "^RSS^CHANNEL^DESCRIPTION";
  if ($curTag == $titleKey) {
    $sTitle = $data;
  }
  elseif ($curTag == $linkKey) {
    $sLink = $data;
  }
  elseif ($curTag == $descKey) {
    $sDescription = $data;
  }

  // now get the items 
  global $arItems, $itemCount;
  $itemTitleKey = "^RSS^CHANNEL^ITEM^TITLE";
  $itemLinkKey = "^RSS^CHANNEL^ITEM^LINK";
  $itemDescKey = "^RSS^CHANNEL^ITEM^DESCRIPTION";

  if ($curTag == $itemTitleKey) {
    // make new xItem    
    $arItems[$itemCount] = new xItem();     

    // set new item object's properties    
    $arItems[$itemCount]->xTitle = $data;
  }
  elseif ($curTag == $itemLinkKey) {
    $arItems[$itemCount]->xLink = $data;
  }
  elseif ($curTag == $itemDescKey) {
    $arItems[$itemCount]->xDescription = $data;
    // increment item counter
    $itemCount++;
  }
}

// main loop
$xml_parser = xml_parser_create();
xml_set_element_handler($xml_parser, "startElement", "endElement");
xml_set_character_data_handler($xml_parser, "characterData");
if (!($fp = fopen($uFile,"r"))) {
  die ("could not open RSS for input");
}
while ($data = fread($fp, 4096)) {
  if (!xml_parse($xml_parser, $data, feof($fp))) {
    die(sprintf("XML error: %s at line %d", xml_error_string(xml_get_error_code($xml_parser)), xml_get_current_line_number($xml_parser)));
  }
}
xml_parser_free($xml_parser);


// write out the items
?>

	<table style="width: 80%; text-align: left;" align="center">

		<?php
		for ($i=0;$i<count($arItems);$i++) {
		  $txItem = $arItems[$i];
		?>
		<tr>
			<td><span style="font-size: large; font-weight: bold"><a href = "<?php echo($txItem->xLink); ?>">
			<?php echo($txItem->xTitle); ?></a></span><br />
			<?php echo($txItem->xDescription); ?><br />
			</td>
		</tr>
		<?php

		}
		?>
	</table>

 

What do I need to alter, to tell it to only show the last 3 posts??  ie: if there are 25 posts, it will only show itemid=23, itemid=24, itemid=25... if there are 9 posts it will show itemid=7, itemid=8, itemid=9  etc... so as posts are added to the feed and the itemid increases it still only shows the last 3??

 

Can anyone help??

 

Thanks in advance...

Chris