RSS aggregator script in php

Hi Guys,

Here is a code of RSS aggregator to fetch RSS news..


<?php

##---------------------------------------------------------------------
##---------------------------------------------------------------------
##    MODULE :: mod_rss
##    by Daniel Tlach
##    e-mail: mail@danaketh.com
##    web: http://www.danaketh.com/
##    B: Saturday, 17th February 2007 03:51:31 AM $1171680691
##    E: Saturday 17th February 2007 10:05:53 PM $1171746353
##---------------------------------------------------------------------
##    FUNCTIONS:
##    > parser($feed, $max, $print)
##    > core_beginElement($parser, $tag)
##    > core_endElement($parser, $tag)
##    > core_characterData($parser, $data)
##    > core_loadFeed()
##---------------------------------------------------------------------
##    KNOWN BUGS:
##
##---------------------------------------------------------------------
##    NOTES:
##    > It's possible to switch between direct output (script prints
##    > immediately) or array output. You can also set how much item you
##    > want to print. If you need/want to modify HTML used in direct
##    > output, find lines 144 - 151.
##---------------------------------------------------------------------

##    USAGE:
$feed = 'http://www.domain.com/feed.xml';
$max_items = 5;
$rss = new mod_rss();

// for direcet output
$direct_output = true;
$rss->parser($feed, $max_items, $direct_output);

// for array output
$direct_output = false;
$rss_array = $rss->parser($feed, $max_items, $direct_output);
##---------------------------------------------------------------------
##    ARRAY OUTPUT:
##    > $var[$row]['title'] - title
##    > $var[$row]['description'] - description
##    > $var[$row]['link'] - link
##    > $var[$row]['date'] - date
##---------------------------------------------------------------------
##---------------------------------------------------------------------

class mod_rss    {

##---------------------------------------------------------------------
##    VARIABLES:
##---------------------------------------------------------------------
var $parser; // parser holder
var $feed; // feed URL

var $title; // item title
var $description; // item content
var $link; // item link
var $pubDate; // item date of publishing
var $insideitem = false; // are we inside ITEM?
var $tag; // name of tag inside item
var $items_max = 0; // max number of item we want to show
var $items_num = 0; // current count of items
var $direct = false; // direct output
var $output = array(); // output array (if direct output is disabled)
var $counter = 0; // counter for direct output array

##---------------------------------------------------------------------
##    FUNCTION: core_parser($feed, $max, $print)
##---------------------------------------------------------------------
function parser($feed, $max, $print)    {
#-> handling wrong values
#-> feed URL
if (!is_string($feed)):
#-> break script
break;
endif;
#-> max items
if (!is_int($max)):
#-> set to 0
$max = 0;
endif;
#-> direct output
if (!is_bool($print)):
#-> disable
$print = false;
endif;

#-> create XML parser instance
$this->parser = xml_parser_create();
#-> assign feed source
$this->feed = $feed;
#-> allow using parser inside object
xml_set_object($this->parser,&$this);
#-> element handler functions
xml_set_element_handler($this->parser, "core_beginElement", "core_endElement");
#-> character data handler
xml_set_character_data_handler($this->parser, "core_characterData");

#-> set maximum of displayed items
#-> we have to set it $max - 1, because counting starts with 0
if ($max == 0 || !$max):
$this->items_max = 0;
else:
$this->items_max = $max - 1;
endif;

#-> set direct output
#-> true - direct output enabled; false - direct output disabled
$this->direct = $print;

#-> call source
$this->core_loadFeed();

return $this->output;
}

##---------------------------------------------------------------------
##    FUNCTION: core_beginElement($parser, $tag)
##---------------------------------------------------------------------
function core_beginElement($parser, $tag) {
#-> called when start tag is encountered
if ($this->insideitem):
$this->tag = $tag;
#-> ITEM encountered
elseif ($tag == "ITEM"):
$this->insideitem = true;
endif;
}

##---------------------------------------------------------------------
##    FUNCTION: core_endElement($parser, $tag)
##---------------------------------------------------------------------
function core_endElement($parser, $tag)    {
#-> called when end tag is encountered
if ($tag == "ITEM" && $this->items_num <= $this->items_max):
#-> direct output is enabled
if ($this->direct == true):
#-> title
printf("<dt><b><a href='%s'>%s</a></b></dt>\n",
trim($this->link),
htmlspecialchars(trim($this->title)));
#-> description
printf("<dd>%s</dd>\n",
htmlspecialchars(trim($this->description)));
#-> date
printf("<dd>%s</dd>\n",
htmlspecialchars(trim($this->pubDate)));
#-> direct output is disabled
else:
#-> title
$this->output[$this->counter]['title'] = $this->link;
#-> description
$this->output[$this->counter]['description'] = $this->description;
#-> link
$this->output[$this->counter]['link'] = $this->link;
#-> date
$this->output[$this->counter]['date'] = $this->pubDate;
#-> counter for array
$this->counter++;
endif;
#-> empty variables
$this->title = NULL;
$this->description = NULL;
$this->link = NULL;
$this->pubDate = NULL;
$this->insideitem = false;
#-> maximum of displayed items
if ($this->items_max > 0):
$this->items_num++;
endif;
endif;
}

##---------------------------------------------------------------------
##    FUNCTION: core_characterData($parser, $tag)
##---------------------------------------------------------------------
function core_characterData($parser, $data) {
#-> if parser is inside item
if ($this->insideitem):
switch ($this->tag):
#-> get title
case "TITLE":
$this->title .= $data;
break;
#-> get description
case "DESCRIPTION":
$this->description .= $data;
break;
#-> get link
case "LINK":
$this->link .= $data;
break;
#-> get date when item was publicated
case "PUBDATE":
$this->pubDate .= $data;
break;
endswitch;
endif;
}

##---------------------------------------------------------------------
##    FUNCTION: core_loadFeed()
##---------------------------------------------------------------------
function core_loadFeed(){
#-> open file
$fp = @fopen($this->feed,"r");
#-> error handling
if (!$fp):
#-> break script
break;
#-> you can also use die()
#die("Unexpected error while reading the Feed");
endif;

#-> read the content
while ($data = fread($fp, 4096)):
#-> put data to parser
xml_parse($this->parser, $data, feof($fp));
endwhile;
#-> close the file
fclose($fp);
#-> free $fp
#-> This is not necessary, but PHP will destroy only variables,
#-> not their values. This is the way how we can handle that.
$fp = NULL;
unset($fp);
#-> release parser
xml_parser_free($this->parser);
}
}

?>

Just change   $feed parameter, and use this script