Problem with RSS feeder (PHP)

Community Forums/General Help/Problem with RSS feeder (PHP)

Guy Fawkes

(Posted 2011) [#1]

Hi all, can someone please tell me why class.myrssparser.php is returning an unexpected T_STRING error at line 4 in class.myrssparser.php?

I need this particular parser, as it allows for reading of images as well as links & text in an RSS feed.

class.myrssparser.php:

<?PHP
  class myRSSParser{
    //# keeps track of current and preceding elements

    var $tags = array();

    //# array containing all feed data
    var $output = array();

    //# return value for display functions

    var $retval = "";

    //# constructor for new object
    function myRSSParser($file)
    {
      //# instantiate xml-parser and assign event handlers

      $xml_parser = xml_parser_create("");
      xml_set_object($xml_parser, $this);
      xml_set_element_handler($xml_parser, "startElement", "endElement");

      xml_set_character_data_handler($xml_parser, "parseData");

      //# open file for reading and send data to xml-parser
      $fp = @fopen($file, 'r') or die("myRSSParser: Could not open $file for input");

      while($data = fread($fp, 4096)) {
        xml_parse($xml_parser, $data, feof($fp)) or die(

          sprintf("myRSSParser: Error <b>%s</b> at line <b>%d</b><br>",
          xml_error_string(xml_get_error_code($xml_parser)),

          xml_get_current_line_number($xml_parser))
        );
      }
      fclose($fp);

      //# dismiss xml parser
      xml_parser_free($xml_parser);

    }

    function startElement($parser, $tagname, $attrs=array())
    {
      //# RSS 2.0 - ENCLOSURE
      if($tagname == "ENCLOSURE" && $attrs) {

        $this->startElement($parser, "ENCLOSURE");
        foreach($attrs as $attr => $attrval) {
          $this->startElement($parser, $attr);

          $this->parseData($parser, $attrval);
          $this->endElement($parser, $attr);
        }

        $this->endElement($parser, "ENCLOSURE");
      }

      //# Yahoo! Media RSS - images
      if($tagname == "MEDIA:CONTENT" && $attrs['URL'] && $attrs['MEDIUM'] == 'image') {

        $this->startElement($parser, "IMAGE");
        $this->parseData($parser, $attrs['URL']);

        $this->endElement($parser, "IMAGE");
      }

      //# check if this element can contain others - list may be edited

      if(preg_match("/^(RDF|RSS|CHANNEL|IMAGE|ITEM)/", $tagname)) {
        if($this->tags) {
          $depth = count($this->tags);

          list($parent, $num) = each($tmp = end($this->tags));
          if($parent) $this->tags[$depth-1][$parent][$tagname]++;

        }
        array_push($this->tags, array($tagname => array()));
      } else {
        if(!preg_match("/^(A|B|I)$/", $tagname)) {

          //# add tag to tags array
          array_push($this->tags, $tagname);
        }
      }
    }


    function endElement($parser, $tagname)
    {
      if(!preg_match("/^(A|B|I)$/", $tagname)) {
        //# remove tag from tags array

        array_pop($this->tags);
      }
    }

    function parseData($parser, $data)
    {
      //# return if data contains no text

      if(!trim($data)) return;

      $evalcode = "\$this->output";
      foreach($this->tags as $tag) {

        if(is_array($tag)) {
          list($tagname, $indexes) = each($tag);
          $evalcode .= "[\"$tagname\"]";

          if(${$tagname}) $evalcode .= "[" . (${$tagname} - 1) . "]";
          if($indexes) extract($indexes);

        } else {
          if(preg_match("/^([A-Z]+):([A-Z]+)$/", $tag, $matches)) {
            $evalcode .= "[\"$matches[1]\"][\"$matches[2]\"]";

          } else {
            $evalcode .= "[\"$tag\"]";
          }
        }
      }
      eval("$evalcode = $evalcode . '" . addslashes($data) . "';");

    }

    //# display a single channel as HTML
    function display_channel($data, $limit)
    {
      extract($data);

      if($IMAGE) {
        //# display channel image(s)
        foreach($IMAGE as $image) $this->display_image($image);

      }
      if($TITLE) {
        //# display channel information
        $this->retval .= "<h1>";

        if($LINK) $this->retval .= "<a href=\"$LINK\" target=\"_blank\">";
        $this->retval .= stripslashes($TITLE);

        if($LINK) $this->retval .= "</a>";
        $this->retval .= "</h1>\n";

        if($DESCRIPTION) $this->retval .= "<p>$DESCRIPTION</p>\n\n";
        $tmp = array();
        if($PUBDATE) $tmp[] = "<small>Published: $PUBDATE</small>";

        if($COPYRIGHT) $tmp[] = "<small>Copyright: $COPYRIGHT</small>";
        if($tmp) $this->retval .= "<p>" . implode("<br>\n", $tmp) . "</p>\n\n";

        $this->retval .= "<div class=\"divider\"><!-- --></div>\n\n";
      }
      if($ITEM) {

        //# display channel item(s)
        foreach($ITEM as $item) {
          $this->display_item($item, "CHANNEL");

          if(is_int($limit) && --$limit <= 0) break;
        }
      }
    }

    //# display a single image as HTML

    function display_image($data, $parent="")
    {
      extract($data);
      if(!$URL) return;


      $this->retval .= "<p>";
      if($LINK) $this->retval .= "<a href=\"$LINK\" target=\"_blank\">";

      $this->retval .= "<img src=\"$URL\"";
      if($WIDTH && $HEIGHT) $this->retval .= " width=\"$WIDTH\" height=\"$HEIGHT\"";

      $this->retval .= " border=\"0\" alt=\"$TITLE\">";
      if($LINK) $this->retval .= "</a>";

      $this->retval .= "</p>\n\n";
    }

    //# display a single item as HTML
    function display_item($data, $parent)

    {
      extract($data);
      if(!$TITLE) return;

      $this->retval .=  "<p><b>";

      if($LINK) $this->retval .=  "<a href=\"$LINK\" target=\"_blank\">";
      $this->retval .= stripslashes($TITLE);

      if($LINK) $this->retval .= "</a>";
      $this->retval .=  "</b>";

      if(!$PUBDATE && $DC["DATE"]) $PUBDATE = $DC["DATE"];
      if($PUBDATE) $this->retval .= " <small>($PUBDATE)</small>";

      $this->retval .=  "</p>\n";

      //# use feed-formatted HTML if provided
      if($CONTENT['ENCODED']) {

        $this->retval .= "<p>" . stripslashes($CONTENT['ENCODED']) . "</p>\n";

      } elseif($DESCRIPTION) {
        if($IMAGE) {
          foreach($IMAGE as $IMG) $this->retval .= "<img src=\"$IMG\">\n";

        }
        $this->retval .=  "<p>" . stripslashes($DESCRIPTION) . "</p>\n\n";

      }

      //# RSS 2.0 - ENCLOSURE
      if($ENCLOSURE) {
        $this->retval .= "<p><small><b>Media:</b> <a href=\"{$ENCLOSURE['URL']}\">";

        $this->retval .= $ENCLOSURE['TYPE'];
        $this->retval .= "</a> ({$ENCLOSURE['LENGTH']} bytes)</small></p>\n\n";

      }

      if($COMMENTS) {
        $this->retval .= "<p style=\"text-align: right;\"><small>";
        $this->retval .= "<a href=\"$COMMENTS\">Comments</a>";

        $this->retval .= "</small></p>\n\n";
      }
    }

    function fixEncoding(&$input, $key, $output_encoding)

    {
      if(!function_exists('mb_detect_encoding')) return $input;

      $encoding = mb_detect_encoding($input);
      switch($encoding)

      {
        case 'ASCII':
        case $output_encoding:
          break;
        case '':
          $input = mb_convert_encoding($input, $output_encoding);

          break;
        default:
          $input = mb_convert_encoding($input, $output_encoding, $encoding);
          break;
      }
    }

    //# display entire feed as HTML

    function getOutput($limit=false, $output_encoding='UTF-8')
    {
      $this->retval = "";

      $start_tag = key($this->output);

      switch($start_tag)
      {
        case "RSS":
          //# new format - channel contains all

          foreach($this->output[$start_tag]["CHANNEL"] as $channel) {
            $this->display_channel($channel, $limit);

          }
          break;

        case "RDF:RDF":
          //# old format - channel and items are separate
          if(isset($this->output[$start_tag]['IMAGE'])) {

            foreach($this->output[$start_tag]['IMAGE'] as $image) {
              $this->display_image($image);

            }
          }
          foreach($this->output[$start_tag]['CHANNEL'] as $channel) {
            $this->display_channel($channel, $limit);

          }
          foreach($this->output[$start_tag]['ITEM'] as $item) {
            $this->display_item($item, $start_tag);

          }
          break;

        case "HTML":
          die("Error: cannot parse HTML document as RSS");

        default:
          die("Error: unrecognized start tag '$start_tag' in getOutput()");

      }

      if($this->retval && is_array($this->retval)) {
        array_walk_recursive($this->retval, 'myRSSParser::fixEncoding', $output_encoding);

      }
      return $this->retval;
    }

    //# return raw data as array
    function getRawOutput($output_encoding='UTF-8')

    {
      array_walk_recursive($this->output, 'myRSSParser::fixEncoding', $output_encoding);
      return $this->output;
    }

  }
?>

index.php (reads the RSS feed):

<?PHP
  # define script parameters
  $BLOGURL    = "http://newsrss.bbc.co.uk/rss/newsonline_uk_edition/front_page/rss.xml";
  $NUMITEMS   = 2;
  $TIMEFORMAT = "j F Y, g:ia";
  $CACHEFILE  = "/tmp/" . md5($BLOGURL);
  $CACHETIME  = 4; # hours

  # download the feed iff a cached version is missing or too old

  if(!file_exists($CACHEFILE) || ((time() - filemtime($CACHEFILE)) > 3600 * $CACHETIME)) {
    if($feed_contents = @file_get_contents($BLOGURL)) {
      # write feed contents to cache file

      $fp = fopen($CACHEFILE, 'w');
      fwrite($fp, $feed_contents);
      fclose($fp);
    }
  }

  include "class.myrssparser.php";
  $rss_parser = new myRSSParser($CACHEFILE);

  # read feed data from cache file
  $feeddata = $rss_parser->getRawOutput();
  extract($feeddata['RSS']['CHANNEL'][0], EXTR_PREFIX_ALL, 'rss');

  # display leading image

  if(isset($rss_IMAGE[0]) && $rss_IMAGE[0]) {
    extract($rss_IMAGE[0], EXTR_PREFIX_ALL, 'img');
    echo "<p><a title=\"{$img_TITLE}\" href=\"{$img_LINK}\"><img src=\"{$img_URL}\&quot alt=\"\"></a></p>\n";
  }

  # display feed title

  echo "<h4><a title=\"",htmlspecialchars($rss_DESCRIPTION),"\" href=\"{$rss_LINK}\" target=\"_blank\">";
  echo htmlspecialchars($rss_TITLE);
  echo "</a></h4>\n";

  # display feed items

  $count = 0;
  foreach($rss_ITEM as $itemdata) {
    echo "<p><b><a href=\"{$itemdata['LINK']}\" target=\"_blank\">";
    echo htmlspecialchars(stripslashes($itemdata['TITLE']));
    echo "</a></b><br>\n";
    echo htmlspecialchars(stripslashes($itemdata['DESCRIPTION'])),"<br>\n";
    echo "<i>",date($TIMEFORMAT, strtotime($itemdata['PUBDATE'])),"</i></p>\n\n";
    if(++$count >= $NUMITEMS) break;
  }

  # display copyright information

  echo "<p><small>&copy; {",htmlspecialchars($rss_COPYRIGHT),"}</small></p>\n";
?>

Thanks for the help! :)

Guy Fawkes

(Posted 2011) [#2]

Anyone? :/