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# class.myatomparser.php

class myAtomParser
{
# 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 = "";

var $encoding = array();

# constructor for new object
function myAtomParser($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("<strong>myAtomParser Error:</strong> Could not open URL $file for input");
while($data = fread($fp, 4096)) {
xml_parse($xml_parser, $data, feof($fp)) or die(
sprintf("myAtomParser: Error <strong>%s</strong> at line <strong>%d</strong>
",
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, $attrs)
{
if($this-&gt;encoding) {
# content is encoded - so keep elements intact
$tmpdata = "&lt;$tagname";
if($attrs) foreach($attrs as $key =&gt; $val) $tmpdata .= " $key=\"$val\"";
$tmpdata .= "&gt;";
$this-&gt;parseData($parser, $tmpdata);
} else {
if($attrs[‘HREF’] &amp;&amp; $attrs[‘REL’] &amp;&amp; $attrs[‘REL’] == ‘alternate’) {
$this-&gt;startElement($parser, ‘LINK’, array());
$this-&gt;parseData($parser, $attrs[‘HREF’]);
$this-&gt;endElement($parser, ‘LINK’);
}
if($attrs[‘TYPE’]) $this-&gt;encoding[$tagname] = $attrs[‘TYPE’];

# check if this element can contain others - list may be edited
if(preg_match("/^(FEED|ENTRY)$/", $tagname)) {
if($this-&gt;tags) {
$depth = count($this-&gt;tags);
list($parent, $num) = each($tmp = end($this-&gt;tags));
if($parent) $this-&gt;tags[$depth-1][$parent][$tagname]++;
}
array_push($this-&gt;tags, array($tagname =&gt; array()));
} else {
# add tag to tags array
array_push($this-&gt;tags, $tagname);
}
}
}

function endElement($parser, $tagname)
{
# remove tag from tags array
if($this-&gt;encoding) {
if(isset($this-&gt;encoding[$tagname])) {
unset($this-&gt;encoding[$tagname]);
array_pop($this-&gt;tags);
} else {
if(!preg_match("/(BR|IMG)/", $tagname)) $this-&gt;parseData($parser, "");
}
} else {
array_pop($this-&gt;tags);
}
}

function parseData($parser, $data)
{
# return if data contains no text
if(!trim($data)) return;
$evalcode = "\$this-&gt;output";
foreach($this-&gt;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\"]";
}
}
}

if(isset($this-&gt;encoding[‘CONTENT’]) &amp;&amp; $this-&gt;encoding[‘CONTENT’] == "text/plain") {
$data = "
<pre>$data</pre>
";
}

eval("$evalcode .= ‘" . addslashes($data) . "’;");
}

# display a single feed as HTML
function display_feed($data, $limit)
{
extract($data);
# if($TITLE) {
#   # display feed information
#   $this-&gt;retval .= "
<h1>";
#   if($LINK) $this-&gt;retval .= "<a href="\" target="\&quot;_blank\&quot;">";
#   $this-&gt;retval .= stripslashes($TITLE);
#   if($LINK) $this-&gt;retval .= "</a>";
#   $this-&gt;retval .= "</h1>
\n";
#   if($TAGLINE) $this-&gt;retval .= "

" . stripslashes($TAGLINE) . "

\n\n";
#   $this-&gt;retval .= "
<div class="\&quot;divider\&quot;"><!– –></div>
\n\n";
# }
if($ENTRY) {
# display feed entry(s)
foreach($ENTRY as $item) {
$this-&gt;display_entry($item, "FEED");
if(is_int($limit) &amp;&amp; –$limit &lt;= 0) break;
}
}
}

# display a single entry as HTML
function display_entry($data, $parent)
{
extract($data);
if(!$TITLE) return;

$this-&gt;retval .=  "
<h3>";
if($LINK) $this-&gt;retval .=  "<a href="\" target="\&quot;_blank\&quot;">";
$this-&gt;retval .= stripslashes($TITLE);
if($LINK) $this-&gt;retval .= "</a>";
$this-&gt;retval .=  "";
if($ISSUED) $this-&gt;retval .= " <small>($ISSUED)</small>";
$this-&gt;retval .=  "</h3>
\n";

# if($AUTHOR) {
#   $this-&gt;retval .=  "

<strong>Author:</strong> " . stripslashes($AUTHOR['NAME']) . "

\n\n";
# }
if($CONTENT) {
$this-&gt;retval .=  "

" . stripslashes($CONTENT) . "

\n\n";
} elseif($SUMMARY) {
$this-&gt;retval .=  "

" . stripslashes($SUMMARY) . "

\n\n";
}
}

function fixEncoding($input, $output_encoding)
{
$encoding = mb_detect_encoding($input);
switch($encoding) {
case ‘ASCII’:
case $output_encoding:
return $input;
case ”:
return mb_convert_encoding($input, $output_encoding);
default:
return mb_convert_encoding($input, $output_encoding, $encoding);
}
}

# display entire feed as HTML
function getOutput($limit=false, $output_encoding=’UTF-8′)
{
$this-&gt;retval = "";
$start_tag = key($this-&gt;output);

switch($start_tag) {
case "FEED":
foreach($this-&gt;output as $feed) $this-&gt;display_feed($feed, $limit);
break;
default:
die("Error: unrecognized start tag ‘$start_tag’ in getOutput()");
}

return $this-&gt;fixEncoding($this-&gt;retval, $output_encoding);
}

# return raw data as array
function getRawOutput($output_encoding=’UTF-8′)
{
return $this-&gt;fixEncoding($this-&gt;output, $output_encoding);
}
}
?&gt;