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PHP-General - Encoding problem with RSS Feeds
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Encoding problem with RSS Feeds PHP Development forum discussing coding practices, tips on PHP, and other PHP-related topics. PHP is an open source scripting language that has taken the web development industry by storm.
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November 21st, 2012, 04:57 PM
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Contributing User
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Join Date: Jul 2006
Posts: 210
Time spent in forums: 2 Days 17 h 10 m 52 sec
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PHP-General - Encoding problem with RSS Feeds
Hi,
I am having problems with the encoding with certain RSS feeds, in that I want to remove certain characters that are showing up, for example: Â
So I have tried to replace these characters and to deal with the encoding to no avail. You will see the two approaches commented out in the code below, but in the place where I have been testing. Is one of these right and if so where should I put the code to get me where I need to be?
PHP Code:
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<!--[if lt IE 9]><script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script><![endif]-->
<link rel="stylesheet" href="../../css/style.css" />
<?PHP
// Original PHP code by Chirp Internet: www.chirp.com.au
// Please acknowledge use of this code by including this header.
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("<b>myRSSParser:</b> 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']) {
///// $CONTENT = html_entity_decode($CONTENT, ENT_QUOTES, "UTF-8");
///// $CONTENT = str_replace('’', "'", $CONTENT);
$this->retval .= "<p>" . stripslashes($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, $encoding);
}
}
// display entire feed as HTML
function getOutput($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;
}
}
?>
Thanks,
G
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November 21st, 2012, 06:36 PM
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Still alive
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Join Date: Mar 2007
Location: Washington, USA
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Ah, that's probably UTF-8. Where are you outputting the feed data? Is that page in UTF-8 too? Are you using utf8_encode() or utf8_decode() anywhere? (You probably shouldn't be.)
Also, if you're using PHP 5+ then jump on board the SimpleXML bandwagon. Much easier to deal with RSS with it than a plain XML parser.
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November 22nd, 2012, 08:55 AM
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Contributing User
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Join Date: Jul 2006
Posts: 210
Time spent in forums: 2 Days 17 h 10 m 52 sec
Reputation Power: 11
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Ok great feedback, I'm on to simplexml now and can see the benefits. Seems it will met my longer term needs anyway
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November 22nd, 2012, 04:47 PM
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Still alive
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Join Date: Mar 2007
Location: Washington, USA
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The only gotcha you'll face is with the <media:content> - it's not as easy to get to as everything else.
Normally you'd get to a node like
With media:content you might try
PHP Code:
$xml->{"media:content"} // the syntactically-correct way of saying $xml->media:content
but SimpleXML doesn't support that. There's an intermediary step:
PHP Code:
$xml->children("media", true)->content
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