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andrew
Mister Road Rage



Joined: 03 Feb 2002
Karma :
PostPosted: 12:14 - 12 Jan 2009    Post subject: Display RSS feed on my PHP page Reply with quote
Hi, i'm trying to display an rss feed on a php page of mine and needed some help.

Somebody gave me this script:

Code:

<?php 
// rss page for Testing - 
$feed_url = "http://rss.feedsportal.com/c/669/f/9809/index.rss";

$xml = simplexml_load_file($feed_url);

// How many items to display
$count = 5;

// How many characters from each item
// 0 (zero) will show them all.
$char = 0;

foreach ($xml->channel->item as $item) {
if($char == 0){
$newstring = $item->description;
}
else{
$newstring = substr($item->description, 0, $char);
}
if($count > 0){
//in case they have non-closed italics or bold, etc ...
echo"</i></b></u></a>\n";
echo"
<div style='font-family:arial; font-size:.8em;'> 
<b>{$item->title}</b><br />
$newstring ... <a href='{$item->guid}'>read more</a>
<br /><br />
</div>
"; 
}
$count--;
}


?>


Now this works, it's just i need to know how to strip out the images. Does anybody here have any ideas?

Cheers
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Kickstart
The Oracle



Joined: 04 Feb 2002
Karma :
PostPosted: 12:34 - 12 Jan 2009    Post subject: Reply with quote
Hi

Quick try. This is pretty crude and there are probably better ways of doing it from someone who properly knows their way round regular expressions.

Code:

<?php 
// rss page for Testing - 
$feed_url = "http://rss.feedsportal.com/c/669/f/9809/index.rss";

$xml = simplexml_load_file($feed_url);

// How many items to display
$count = 5;

// How many characters from each item
// 0 (zero) will show them all.
$char = 0;

foreach ($xml->channel->item as $item)
{
   if($char == 0)
   {
      $newstring = $item->description;
   }
   else
   {
      $newstring = substr($item->description, 0, $char);
   }
   
   $newstringarray = preg_split("/(<.*?>)/",$text,-1,PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
   
   $newstring2 = "";
   $inimage = false;
   foreach ($newstringarray as $newstringitem)
   {
      if (inimage)
      {
         if (substr(strtolower($newstringitem),0,5) == "</img")
         {
            $inimage = false;
         }
      }
      else
      {
         if (substr(strtolower($newstringitem),0,4) == "<img")
         {
            $inimage = true;
         }
         else
         {
            $newstring2 .= $newstringitem;
         }
      }
   }
   
   if($count > 0)
   {
      //in case they have non-closed italics or bold, etc ...
      echo"</i></b></u></a>\n";
      echo"
      <div style='font-family:arial; font-size:.8em;'> 
      <b>{$item->title}</b><br />
      $newstring2 ... <a href='{$item->guid}'>read more</a>
      <br /><br />
      </div>
      "; 
   }
   $count--;
}


?>


One obvious bug is that leading spaces within an img tag which would probably work in the browser would be ignored in this script.

All the best

Keith
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andrew
Mister Road Rage



Joined: 03 Feb 2002
Karma :
PostPosted: 12:47 - 12 Jan 2009    Post subject: Reply with quote
Cheers keith, the only problem with that is in this feed it is totally stripping out the description that comes after the <img> tag, any ideas how this could be kept in and still controlled using the $char variable?
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Kickstart
The Oracle



Joined: 04 Feb 2002
Karma :
PostPosted: 13:09 - 12 Jan 2009    Post subject: Reply with quote
Hi

Another try.

Code:

<?php 
// rss page for Testing - 
$feed_url = "http://rss.feedsportal.com/c/669/f/9809/index.rss";

$xml = simplexml_load_file($feed_url);

// How many items to display
$count = 15;

// How many characters from each item
// 0 (zero) will show them all.
$char = 0;

foreach ($xml->channel->item as $item)
{
   if($char == 0)
   {
      $newstring = $item->description;
   }
   else
   {
      $newstring = substr($item->description, 0, $char);
   }
   
   $newstringarray = preg_split("/(<.*?>)/",$newstring,-1,PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
   
   $newstring2 = "";
   foreach ($newstringarray as $newstringitem)
   {
      if (substr(strtolower($newstringitem),0,4) != "<img")
      {
         $newstring2 .= $newstringitem;
      }
   }
   
   if($count > 0)
   {
      //in case they have non-closed italics or bold, etc ...
      echo"</i></b></u></a>\n";
      echo"
      <div style='font-family:arial; font-size:.8em;'> 
      <b>{$item->title}</b><br />
      $newstring2 ... <a href='{$item->guid}'>read more</a>
      <br /><br />
      </div>
      "; 
   }
   $count--;
}


?>


All the best

Keith
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andrew
Mister Road Rage



Joined: 03 Feb 2002
Karma :
PostPosted: 13:18 - 12 Jan 2009    Post subject: Reply with quote
That's spot on, the only problem i have now is i've been told that it needs to cache the feeds so it doesn't request them everytime the page is loaded. Arrgghhh Very Happy
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Kickstart
The Oracle



Joined: 04 Feb 2002
Karma :
PostPosted: 13:28 - 12 Jan 2009    Post subject: Reply with quote
Andrew wrote:
That's spot on, the only problem i have now is i've been told that it needs to cache the feeds so it doesn't request them everytime the page is loaded. Arrgghhh Very Happy


It is an off site cache. You store them on that web page Wink .

All the best

Keith
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andrew
Mister Road Rage



Joined: 03 Feb 2002
Karma :
PostPosted: 13:31 - 12 Jan 2009    Post subject: Reply with quote
The problem is, the page i'm putting them on gets quite a few hits, if i request the feeds too often they'll be blocked. Very Happy

How hard would it be to make that script request new rss items every 30 mins say and display what was grabbed in the last updated sorta thing?
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Kickstart
The Oracle



Joined: 04 Feb 2002
Karma :
PostPosted: 13:35 - 12 Jan 2009    Post subject: Reply with quote
Hi

Read the RSS and store it in a text file somewhere on the server. Any further reads you check for the time / date of the saved file and refresh if old.

Or you do the above but store it on a database.

In either case you could store the processed version.

First is probably quicker and easier, but potentially less secure.

All the best

Keith
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andrew
Mister Road Rage



Joined: 03 Feb 2002
Karma :
PostPosted: 15:16 - 14 Jan 2009    Post subject: Reply with quote
Hi Keith, wondering if you could help me, i'm using a totally different bit of code now....

To parse the feed:
Code:

//FUNCTION TO PARSE RSS
  function parseRSS($url_tech) {

  //PARSE RSS FEED
  $feedeed = implode('', file($url_tech));
  $parser = xml_parser_create();
            xml_parse_into_struct($parser, $feedeed, $valueals, $index);
            xml_parser_free($parser);

  //CONSTRUCT ARRAY
  foreach($valueals as $keyey => $valueal){
    if($valueal['type'] != 'cdata') {
       $rss_item[$keyey] = $valueal; 
    }
  }

  $i = 0;
  foreach($rss_item as $key => $value){
    if($value['type'] == 'open') {
       $i++;
       $itemame[$i] = $value['tag'];
    } elseif($value['type'] == 'close') {
             $feed = $values[$i];
             $rss_item = $itemame[$i];
             $i--;

        if(count($values[$i])>1){
           $values[$i][$rss_item][] = $feed;
        } else { $values[$i][$rss_item] = $feed;
          }
      }   else { $values[$i][$value['tag']] = $value['value'];
          }
  }

   //RETURN ARRAY VALUES
        return $values[0];
   }


To draw it:
Code:


//PARSE THE RSS FEED INTO ARRAY
          $xml = parseRSS("http://rss.feedsportal.com/c/669/f/9809/index.rss");

          foreach($xml['RSS']['CHANNEL']['ITEM'] as $rss_item) {
                 $rss_title = $rss_item['TITLE'] ;
                  $rss_link = $rss_item['LINK'];

                // Limit FEED headline length
                $string_length = 200;

                if (strlen($rss_title) > $limit) {
                   $rss_title = substr($rss_title, 0, strrpos(substr($rss_title, 0, $string_length), ' '));
                }

          $tpl->setCurrentBlock("rss_tech");
            $tpl->setVariable(array(
               "rss_tech.title" => $rss_title,
              "rss_tech.link" => $rss_link,
          ));
          $tpl->parseCurrentBlock();
        }


This fits within the cache system on the site i'm working on but i have one question, how would i limit the results so it only displays the first 10 feeds, at the moment it's displaying the whole lot.

If you could help me with this it would be a big help.

Cheers
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Kickstart
The Oracle



Joined: 04 Feb 2002
Karma :
PostPosted: 15:35 - 14 Jan 2009    Post subject: Reply with quote
Hi

This is using something I have never used in php, so not certain it will work.

Replace the "foreach" in your second code fragment with:-

Code:

        $count = 0;
        while ( list(,$rss_item) = each($xml['RSS']['CHANNEL']['ITEM']) AND $count++ < 5) {


You might have to reset the array before the while.

Or cruder

Code:

$count = 0;
foreach($xml['RSS']['CHANNEL']['ITEM'] as $rss_item) {
if ($count++ >= 5) break;


All the best

Keith
____________________
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andrew
Mister Road Rage



Joined: 03 Feb 2002
Karma :
PostPosted: 15:56 - 14 Jan 2009    Post subject: Reply with quote
Nice one. Thumbs Up Got it working using both methods, decided to carry on using the foreach.
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andrew
Mister Road Rage



Joined: 03 Feb 2002
Karma :
PostPosted: 16:06 - 20 Jan 2009    Post subject: Reply with quote
Keith, do you know why this would be kicking out "Call to a member function on a non-object" errors?

Code:

//FUNCTION TO PARSE RSS
  function parseRSS($url_tech) {

  //PARSE RSS FEED
  $feedeed = implode('', file($url_tech));
  $parser = xml_parser_create();
            xml_parse_into_struct($parser, $feedeed, $valueals, $index);
            xml_parser_free($parser);

  //CONSTRUCT ARRAY
  foreach($valueals as $keyey => $valueal){
    if($valueal['type'] != 'cdata') {
       $rss_item[$keyey] = $valueal; 
    }
  }

  $i = 0;
  foreach($rss_item as $key => $value){
    if($value['type'] == 'open') {
       $i++;
       $itemame[$i] = $value['tag'];
    } elseif($value['type'] == 'close') {
             $feed = $values[$i];
             $rss_item = $itemame[$i];
             $i--;

        if(count($values[$i])>1){
           $values[$i][$rss_item][] = $feed;
        } else { $values[$i][$rss_item] = $feed;
          }
      }   else { $values[$i][$value['tag']] = $value['value'];
          }
  }

   //RETURN ARRAY VALUES
        return $values[0];
   }

  function draw_rss($pagecode) {
    global $CONFIG, $SITE, $CACHE_PAGES, $CHANNEL, $FORMAT, $SITE_BASEURL;

     $cache_ttl = 600;
    $cache_cat = 'rss_tech';
    $cache_key = $cache_cat . $SITE . $CHANNEL . $FORMAT;

    if (($html = get_cached_page($cache_key)) && $CACHE_PAGES) {
      dlog("Techradar box retrieved from cache");
    } else {
        dlog("Generating  box from scratch");

        $tpl = make_template('common_elements/rss.html');

          //PARSE THE RSS FEED INTO ARRAY
          $xml = parseRSS("feed");

        $count = 0;
          foreach($xml['RSS']['CHANNEL']['ITEM'] as $rss_item) {
               if ($count++ >= 10) break;
                 $rss_title = $rss_item['TITLE'] ;
                  $rss_link = $rss_item['LINK'];

                // Limit FEED headline length
                $string_length = 200;

                if (strlen($rss_title) > $limit) {
                   $rss_title = substr($rss_title, 0, strrpos(substr($rss_title, 0, $string_length), ' '));
                }

          $tpl->setCurrentBlock("rss_tech");
            $tpl->setVariable(array(
               "rss_tech.title" => $rss_title,
              "rss_tech.link" => $rss_link,
          ));
          $tpl->parseCurrentBlock();
        }
      }
       $html = $tpl->get();
      $tpl->free();           
     
      if ($CACHE_PAGES) {
        put_cached_page($cache_key, $cache_cat, $html, $cache_ttl);
      }     
           
   
    $html = str_replace('[SITE_BASEURL]', $SITE_BASEURL, $html);
    return str_replace('[COMMON.rss_tech]', $html, $pagecode);
  }


It's something to do with

$html = $tpl->get();
$tpl->free();

Thanks,
Andrew
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Kickstart
The Oracle



Joined: 04 Feb 2002
Karma :
PostPosted: 16:37 - 20 Jan 2009    Post subject: Reply with quote
Hi

Looks like the tpl object might not have been set up correctly (not that I tend to use OO stuff much).

Suspect the line:-

$tpl = make_template('common_elements/rss.html');

should be

$tpl = new make_template('common_elements/rss.html');

All the best

Keith
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