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<?php
/**
* Project: MagpieRSS: a simple RSS integration tool
* File: rss_parse.inc - parse an RSS or Atom feed
* return as a simple object.
*
* Handles RSS 0.9x, RSS 2.0, RSS 1.0, Atom 0.3, and Atom 1.0
*
* The lastest version of MagpieRSS can be obtained from:
* http://magpierss.sourceforge.net
*
* For questions, help, comments, discussion, etc., please join the
* Magpie mailing list:
* magpierss-general@lists.sourceforge.net
*
* @author Kellan Elliott-McCrea <kellan@protest.net>
* @version 0.8
* @license GPL
*
*/
define('RSS', 'RSS');
define('ATOM', 'Atom');
if (!defined('MAGPIE_DIR')) {
define('MAGPIE_DIR', dirname(__FILE__) . DIRECTORY_SEPARATOR);
}
require_once (MAGPIE_DIR . 'rss_utils.inc');
/**
* Hybrid parser, and object, takes RSS as a string and returns a simple object.
*
* see: rss_fetch.inc for a simpler interface with integrated caching support
*
*/
class MagpieRSS {
var $parser;
var $current_item = array(); // item currently being parsed
var $items = array(); // collection of parsed items
var $channel = array(); // hash of channel fields
var $textinput = array();
var $image = array();
var $feed_type;
var $feed_version;
var $encoding = ''; // output encoding of parsed rss
var $_source_encoding = ''; // only set if we have to parse xml prolog
var $ERROR = "";
var $WARNING = "";
# define some constants
var $_ATOM_CONTENT_CONSTRUCTS = array(
'content', 'summary', 'title', /* common */
'info', 'tagline', 'copyright', /* Atom 0.3 */
'rights', 'subtitle', /* Atom 1.0 */
);
var $_XHTML_CONTENT_CONSTRUCTS = array('body', 'div');
var $_KNOWN_ENCODINGS = array('UTF-8', 'US-ASCII', 'ISO-8859-1');
# parser variables, useless if you're not a parser, treat as private
var $stack = array(); # parser stack
var $inchannel = false;
var $initem = false;
var $incontent = array(); # non-empty if in namespaced XML content field
var $exclude_top = false; # true when Atom 1.0 type="xhtml"
var $intextinput = false;
var $inimage = false;
var $current_namespace = false;
/**
* Set up XML parser, parse source, and return populated RSS object..
*
* @param string $source string containing the RSS to be parsed
*
* NOTE: Probably a good idea to leave the encoding options alone unless
* you know what you're doing as PHP's character set support is
* a little weird.
*
* NOTE: A lot of this is unnecessary but harmless with PHP5
*
*
* @param string $output_encoding output the parsed RSS in this character
* set defaults to ISO-8859-1 as this is PHP's
* default.
*
* NOTE: might be changed to UTF-8 in future
* versions.
*
* @param string $input_encoding the character set of the incoming RSS source.
* Leave blank and Magpie will try to figure it
* out.
*
*
* @param bool $detect_encoding if false Magpie won't attempt to detect
* source encoding. (caveat emptor)
*
*/
function MagpieRSS ($source, $output_encoding='ISO-8859-1',
$input_encoding=null, $detect_encoding=true)
{
#
# if PHP xml isn't compiled in, die
#
if (!function_exists('xml_parser_create')) {
$this->error( "Failed to load PHP's XML Extension. " .
"http://www.php.net/manual/en/ref.xml.php",
E_USER_ERROR );
}
list($parser, $source) = $this->create_parser($source,
$output_encoding, $input_encoding, $detect_encoding);
if (!is_resource($parser)) {
$this->error( "Failed to create an instance of PHP's XML parser. " .
"http://www.php.net/manual/en/ref.xml.php",
E_USER_ERROR );
}
$this->parser = $parser;
#
# pass in parser, and a reference to this object
# setup handlers
#
xml_set_object( $this->parser, $this );
xml_set_element_handler($this->parser,
'feed_start_element', 'feed_end_element' );
xml_set_character_data_handler( $this->parser, 'feed_cdata' );
$status = xml_parse( $this->parser, $source ); # parse the feed
if (! $status ) {
$errorcode = xml_get_error_code( $this->parser );
if ( $errorcode != XML_ERROR_NONE ) {
$xml_error = xml_error_string( $errorcode );
$error_line = xml_get_current_line_number($this->parser);
$error_col = xml_get_current_column_number($this->parser);
$errormsg = "$xml_error at line $error_line, column $error_col";
$this->error( $errormsg );
}
}
xml_parser_free( $this->parser );
$this->normalize();
}
function feed_start_element($p, $element, &$attrs) {
$el = $element = strtolower($element);
$attrs = array_change_key_case($attrs, CASE_LOWER);
# check for a namespace, and split if found
# only if we're not inside a content tag
if ( empty($this->incontent) ) {
$ns = false;
if ( strpos( $element, ':' ) ) {
list($ns, $el) = explode( ':', $element, 2); //split is deprecated
}
if ( $ns and $ns != 'rdf' ) {
$this->current_namespace = $ns;
}
}
#
# if feed type isn't set, then this is first element of feed
# identify feed from root element
#
if (!isset($this->feed_type) ) {
if ( $el == 'rdf' ) {
$this->feed_type = RSS;
$this->feed_version = '1.0';
}
elseif ( $el == 'rss' ) {
$this->feed_type = RSS;
$this->feed_version = $attrs['version'];
}
elseif ( $el == 'feed' ) {
$this->feed_type = ATOM;
if ($attrs['xmlns'] == 'http://www.w3.org/2005/Atom') { // Atom 1.0
$this->feed_version = '1.0';
}
else {
# Atom 0.3, probably.
$this->feed_version = $attrs['version'];
}
$this->inchannel = true;
}
return;
}
#
# if we're inside a namespaced content construct, treat tags as text
#
if ( !empty($this->incontent) ) {
if ((count($this->incontent) > 1) or !$this->exclude_top) {
# if tags are inlined, then flatten
$attrs_str = join(' ',
array_map('map_attrs',
array_keys($attrs),
array_values($attrs))
);
if (strlen($attrs_str)) {
$attrs_str = ' '.$attrs_str;
}
$this->append_content( "<{$element}{$attrs_str}>" );
}
array_push($this->incontent, $el); # stack for parsing content XML
}
elseif ( $el == 'channel' ) {
$this->inchannel = true;
}
elseif ($el == 'item' or $el == 'entry' )
{
$this->initem = true;
if ( isset($attrs['rdf:about']) ) {
$this->current_item['about'] = $attrs['rdf:about'];
}
}
elseif (
$this->feed_type == RSS and
$this->current_namespace == '' and
$el == 'textinput' )
{
# else we're in the default namespace of an RSS feed,
# record textinput or image fields
$this->intextinput = true;
}
elseif (
$this->feed_type == RSS and
$this->current_namespace == '' and
$el == 'image' )
{
$this->inimage = true;
}
else {
// set stack[0] to current element
# Atom support many links per containing element.
# Magpie treats link elements of type rel='alternate'
# as being equivalent to RSS's simple link element.
$atom_link = false;
if ($this->feed_type == ATOM and $el == 'link') {
$atom_link = true;
if (isset($attrs['rel']) and $attrs['rel'] != 'alternate') {
$el = $el . "_" . $attrs['rel']; // pseudo-element names for Atom link elements
}
}
elseif ( $this->feed_type == ATOM and
in_array($el, $this->_ATOM_CONTENT_CONSTRUCTS) )
{
# handle atom content constructs
# avoid clashing w/ RSS mod_content
if ($el == 'content' ) {
$el = 'atom_content';
}
#
# assume that everything accepts namespaced XML
# (that will pass through some non-validating feeds;
# but so what? this isn't a validating parser)
#
$this->incontent = array();
array_push($this->incontent, $el); // start a stack
if ( isset($attrs['type']) and trim(strtolower($attrs['type']))=='xhtml') {
$this->exclude_top = true;
} else {
$this->exclude_top = false;
}
}
elseif (($this->current_namespace=='xhtml' or
(isset($attrs['xmlns']) and $attrs['xmlns'] == 'http://www.w3.org/1999/xhtml'))
and in_array($el, $this->_XHTML_CONTENT_CONSTRUCTS) )
{
# Handle inline XHTML body elements --CWJ
$this->current_namespace = 'xhtml';
$this->incontent = array();
array_push($this->incontent, $el); // start a stack
$this->exclude_top = false;
}
array_unshift($this->stack, $el);
$elpath = join('_', array_reverse($this->stack));
$n = $this->element_count($elpath);
$this->element_count($elpath, $n+1);
if ($n > 0) {
array_shift($this->stack);
array_unshift($this->stack, $el.'#'.($n+1)); # TODO: revisit this
$elpath = join('_', array_reverse($this->stack));
}
# this makes the baby Jesus cry, but we can't do it in normalize()
# because we've made the element name for Atom links unpredictable
# by tacking on the relation to the end. -CWJ
if ($atom_link and isset($attrs['href'])) {
$this->append($elpath, $attrs['href']);
}
# add attributes
if (count($attrs) > 0) {
$this->append($elpath.'@', join(',', array_keys($attrs)));
foreach ($attrs as $attr => $value) {
$this->append($elpath.'@'.$attr, $value);
}
}
}
}
function feed_cdata ($p, $text) {
if ($this->incontent) {
$this->append_content( $text );
}
else {
$current_el = join('_', array_reverse($this->stack));
$this->append($current_el, $text);
}
}
function feed_end_element ($p, $el) {
$el = strtolower($el);
if ( $this->incontent ) {
$opener = array_pop($this->incontent);
# Don't get bamboozled by namespace voodoo
if (strpos($el, ':')) {
list($ns, $closer) = split(':', $el);
}
else {
$ns = false; $closer = $el;
}
# Don't get bamboozled by our munging of <atom:content>, either
if ($this->feed_type == ATOM and $closer == 'content') {
$closer = 'atom_content';
}
# balance tags properly
# NOTE: i don't think this is actually neccessary
if ($opener != $closer) {
array_push($this->incontent, $opener);
$this->append_content("<$el />");
}
elseif ($this->incontent) {
# in the content construct
if ((count($this->incontent) > 1) or !$this->exclude_top) {
$this->append_content("</$el>");
}
}
else {
# shift the opening of the content construct off the normal stack
array_shift( $this->stack );
}
}
elseif ( $el == 'item' or $el == 'entry' ) {
$this->items[] = $this->current_item;
$this->current_item = array();
$this->initem = false;
$this->current_category = 0;
}
elseif ($this->feed_type == RSS and
$this->current_namespace == '' and $el == 'textinput' ) {
$this->intextinput = false;
}
elseif ($this->feed_type == RSS and
$this->current_namespace == '' and $el == 'image' ) {
$this->inimage = false;
}
elseif ($el == 'channel' or $el == 'feed' ) {
$this->inchannel = false;
}
else {
array_shift( $this->stack );
}
if ( !$this->incontent ) {
# Don't munge the namespace after finishing with elements in namespaced content constructs -CWJ
$this->current_namespace = false;
}
}
function concat (&$str1, $str2="") {
if (!isset($str1) ) {
$str1="";
}
$str1 .= $str2;
}
function append_content($text) {
if ( $this->initem ) {
if ($this->current_namespace) {
$this->concat( $this->current_item[$this->current_namespace][ reset($this->incontent) ], $text );
} else {
$this->concat( $this->current_item[ reset($this->incontent) ], $text );
}
}
elseif ( $this->inchannel ) {
if ($this->current_namespace) {
$this->concat( $this->channel[$this->current_namespace][ reset($this->incontent) ], $text );
}
else {
$this->concat( $this->channel[ reset($this->incontent) ], $text );
}
}
}
# smart append - field and namespace aware
function append($el, $text) {
if (!$el) {
return;
}
if ( $this->current_namespace ) {
if ( $this->initem ) {
$this->concat(
$this->current_item[ $this->current_namespace ][ $el ], $text );
}
elseif ($this->inchannel) {
$this->concat(
$this->channel[ $this->current_namespace][ $el ], $text );
}
elseif ($this->intextinput) {
$this->concat(
$this->textinput[ $this->current_namespace][ $el ], $text );
}
elseif ($this->inimage) {
$this->concat(
$this->image[ $this->current_namespace ][ $el ], $text );
}
}
else {
if ( $this->initem ) {
$this->concat( $this->current_item[ $el ], $text );
}
elseif ($this->intextinput) {
$this->concat( $this->textinput[ $el ], $text );
}
elseif ($this->inimage) {
$this->concat( $this->image[ $el ], $text );
}
elseif ($this->inchannel) {
$this->concat( $this->channel[ $el ], $text );
}
}
}
# smart count - field and namespace aware
function element_count ($el, $set = NULL) {
if (!$el) {
return;
}
if ( $this->current_namespace ) {
if ( $this->initem ) {
if (!is_null($set)) {
$this->current_item[ $this->current_namespace ][ $el.'#' ] = $set;
}
$ret = (isset($this->current_item[ $this->current_namespace ][ $el.'#' ]) ?
$this->current_item[ $this->current_namespace ][ $el.'#' ] : 0);
}
elseif ($this->inchannel) {
if (!is_null($set)) {
$this->channel[ $this->current_namespace ][ $el.'#' ] = $set;
}
$ret = (isset($this->channel[ $this->current_namespace][ $el.'#' ]) ?
$this->channel[ $this->current_namespace][ $el.'#' ] : 0);
}
}
else {
if ( $this->initem ) {
if (!is_null($set)) {
$this->current_item[ $el.'#' ] = $set;
}
$ret = (isset($this->current_item[ $el.'#' ]) ?
$this->current_item[ $el.'#' ] : 0);
}
elseif ($this->inchannel) {
if (!is_null($set)) {
$this->channel[ $el.'#' ] = $set;
}
$ret = (isset($this->channel[ $el.'#' ]) ?
$this->channel[ $el.'#' ] : 0);
}
}
return $ret;
}
function normalize_enclosure (&$source, $from, &$dest, $to, $i) {
$id_from = $this->element_id($from, $i);
$id_to = $this->element_id($to, $i);
if (isset($source["{$id_from}@"])) {
foreach (explode(',', $source["{$id_from}@"]) as $attr) {
if ($from=='link_enclosure' and $attr=='href') {
# from Atom
$dest["{$id_to}@url"] = $source["{$id_from}@{$attr}"];
$dest["{$id_to}"] = $source["{$id_from}@{$attr}"];
}
elseif ($from=='enclosure' and $attr=='url') {
# from RSS
$dest["{$id_to}@href"] = $source["{$id_from}@{$attr}"];
$dest["{$id_to}"] = $source["{$id_from}@{$attr}"];
}
else {
$dest["{$id_to}@{$attr}"] = $source["{$id_from}@{$attr}"];
}
}
}
}
function normalize_atom_person (&$source, $person, &$dest, $to, $i) {
$id = $this->element_id($person, $i);
$id_to = $this->element_id($to, $i);
# Atom 0.3 <=> Atom 1.0
if ($this->feed_version >= 1.0) {
$used = 'uri'; $norm = 'url';
}
else {
$used = 'url'; $norm = 'uri';
}
if (isset($source["{$id}_{$used}"])) {
$dest["{$id_to}_{$norm}"] = $source["{$id}_{$used}"];
}
# Atom to RSS 2.0 and Dublin Core
# RSS 2.0 person strings should be valid e-mail addresses if possible.
if (isset($source["{$id}_email"])) {
$rss_author = $source["{$id}_email"];
}
if (isset($source["{$id}_name"])) {
$rss_author = $source["{$id}_name"] . (isset($rss_author) ? " <$rss_author>" : '');
}
if (isset($rss_author)) {
$source[$id] = $rss_author; # goes to top-level author or contributor
$dest[$id_to] = $rss_author; # goes to dc:creator or dc:contributor
}
}
# Normalize Atom 1.0 and RSS 2.0 categories to Dublin Core...
function normalize_category (&$source, $from, &$dest, $to, $i) {
$cat_id = $this->element_id($from, $i);
$dc_id = $this->element_id($to, $i);
# first normalize category elements: Atom 1.0 <=> RSS 2.0
if ( isset($source["{$cat_id}@term"]) ) {
# category identifier
$source[$cat_id] = $source["{$cat_id}@term"];
}
elseif ( $this->feed_type == RSS ) {
$source["{$cat_id}@term"] = $source[$cat_id];
}
if ( isset($source["{$cat_id}@scheme"]) ) { // URI to taxonomy
$source["{$cat_id}@domain"] = $source["{$cat_id}@scheme"];
} elseif ( isset($source["{$cat_id}@domain"]) ) {
$source["{$cat_id}@scheme"] = $source["{$cat_id}@domain"];
}
// Now put the identifier into dc:subject
$dest[$dc_id] = $source[$cat_id];
}
# ... or vice versa
function normalize_dc_subject (&$source, $from, &$dest, $to, $i) {
$dc_id = $this->element_id($from, $i);
$cat_id = $this->element_id($to, $i);
$dest[$cat_id] = $source[$dc_id]; // RSS 2.0
$dest["{$cat_id}@term"] = $source[$dc_id]; // Atom 1.0
}
# simplify the logic for normalize(). Makes sure that count of elements and
# each of multiple elements is normalized properly. If you need to mess
# with things like attributes or change formats or the like, pass it a
# callback to handle each element.
function normalize_element (&$source, $from, &$dest, $to, $via = NULL) {
if (isset($source[$from]) or isset($source["{$from}#"])) {
if (isset($source["{$from}#"])) {
$n = $source["{$from}#"];
$dest["{$to}#"] = $source["{$from}#"];
}
else {
$n = 1;
}
for ($i = 1; $i <= $n; $i++) {
if (isset($via)) { // custom callback for ninja attacks
$this->{$via}($source, $from, $dest, $to, $i);
}
else { // just make it the same
$from_id = $this->element_id($from, $i);
$to_id = $this->element_id($to, $i);
$dest[$to_id] = $source[$from_id];
}
}
}
}
function normalize () {
// if atom populate rss fields and normalize 0.3 and 1.0 feeds
if ( $this->is_atom() ) {
// Atom 1.0 elements <=> Atom 0.3 elements (Thanks, o brilliant wordsmiths of the Atom 1.0 standard!)
if ($this->feed_version < 1.0) {
$this->normalize_element($this->channel, 'tagline', $this->channel, 'subtitle');
$this->normalize_element($this->channel, 'copyright', $this->channel, 'rights');
$this->normalize_element($this->channel, 'modified', $this->channel, 'updated');
}
else {
$this->normalize_element($this->channel, 'subtitle', $this->channel, 'tagline');
$this->normalize_element($this->channel, 'rights', $this->channel, 'copyright');
$this->normalize_element($this->channel, 'updated', $this->channel, 'modified');
}
$this->normalize_element($this->channel, 'author', $this->channel['dc'], 'creator', 'normalize_atom_person');
$this->normalize_element($this->channel, 'contributor', $this->channel['dc'], 'contributor', 'normalize_atom_person');
// Atom elements to RSS elements
$this->normalize_element($this->channel, 'subtitle', $this->channel, 'description');
if ( isset($this->channel['logo']) ) {
$this->normalize_element($this->channel, 'logo', $this->image, 'url');
$this->normalize_element($this->channel, 'link', $this->image, 'link');
$this->normalize_element($this->channel, 'title', $this->image, 'title');
}
for ( $i = 0; $i < count($this->items); $i++) {
$item = $this->items[$i];
// Atom 1.0 elements <=> Atom 0.3 elements
if ($this->feed_version < 1.0) {
$this->normalize_element($item, 'modified', $item, 'updated');
$this->normalize_element($item, 'issued', $item, 'published');
} else {
$this->normalize_element($item, 'updated', $item, 'modified');
$this->normalize_element($item, 'published', $item, 'issued');
}
// "If an atom:entry element does not contain
// atom:author elements, then the atom:author elements
// of the contained atom:source element are considered
// to apply. In an Atom Feed Document, the atom:author
// elements of the containing atom:feed element are
// considered to apply to the entry if there are no
// atom:author elements in the locations described
// above." <http://atompub.org/2005/08/17/draft-ietf-atompub-format-11.html#rfc.section.4.2.1>
if (!isset($item["author#"])) {
if (isset($item["source_author#"])) { // from aggregation source
$source = $item;
$author = "source_author";
} elseif (isset($this->channel["author#"])) { // from containing feed
$source = $this->channel;
$author = "author";
}
$item["author#"] = $source["{$author}#"];
for ($au = 1; $au <= $item["author#"]; $au++) {
$id_to = $this->element_id('author', $au);
$id_from = $this->element_id($author, $au);
$item[$id_to] = $source[$id_from];
foreach (array('name', 'email', 'uri', 'url') as $what) {
if (isset($source["{$id_from}_{$what}"])) {
$item["{$id_to}_{$what}"] = $source["{$id_from}_{$what}"];
}
}
}
}
// Atom elements to RSS elements
$this->normalize_element($item, 'author', $item['dc'], 'creator', 'normalize_atom_person');
$this->normalize_element($item, 'contributor', $item['dc'], 'contributor', 'normalize_atom_person');
$this->normalize_element($item, 'summary', $item, 'description');
$this->normalize_element($item, 'atom_content', $item['content'], 'encoded');
$this->normalize_element($item, 'link_enclosure', $item, 'enclosure', 'normalize_enclosure');
// Categories
if ( isset($item['category#']) ) {
# Atom 1.0 categories to dc:subject and RSS 2.0 categories
$this->normalize_element($item, 'category', $item['dc'], 'subject', 'normalize_category');
}
elseif ( isset($item['dc']['subject#']) ) {
# dc:subject to Atom 1.0 and RSS 2.0 categories
$this->normalize_element($item['dc'], 'subject', $item, 'category', 'normalize_dc_subject');
}
// Normalized item timestamp
$atom_date = (isset($item['published']) ) ? $item['published'] : $item['updated'];
if ( $atom_date ) {
$epoch = @parse_w3cdtf($atom_date);
if ($epoch and $epoch > 0) {
$item['date_timestamp'] = $epoch;
}
}
$this->items[$i] = $item;
}
}
elseif ( $this->is_rss() ) {
// RSS elements to Atom elements
$this->normalize_element($this->channel, 'description', $this->channel, 'tagline'); // Atom 0.3
$this->normalize_element($this->channel, 'description', $this->channel, 'subtitle'); // Atom 1.0 (yay wordsmithing!)
$this->normalize_element($this->image, 'url', $this->channel, 'logo');
for ( $i = 0; $i < count($this->items); $i++) {
$item = $this->items[$i];
// RSS elements to Atom elements
$this->normalize_element($item, 'description', $item, 'summary');
$this->normalize_element($item['content'], 'encoded', $item, 'atom_content');
$this->normalize_element($item, 'enclosure', $item, 'link_enclosure', 'normalize_enclosure');
// Categories
if ( isset($item['category#']) ) {
# RSS 2.0 categories to dc:subject and Atom 1.0 categories
$this->normalize_element($item, 'category', $item['dc'], 'subject', 'normalize_category');
}
elseif ( isset($item['dc']['subject#']) ) {
# dc:subject to Atom 1.0 and RSS 2.0 categories
$this->normalize_element($item['dc'], 'subject', $item, 'category', 'normalize_dc_subject');
}
// Normalized item timestamp
if ( $this->is_rss() == '1.0' and isset($item['dc']['date']) ) {
$epoch = @parse_w3cdtf($item['dc']['date']);
if ($epoch and $epoch > 0) {
$item['date_timestamp'] = $epoch;
}
}
elseif ( isset($item['pubdate']) ) {
$epoch = @strtotime($item['pubdate']);
if ($epoch > 0) {
$item['date_timestamp'] = $epoch;
}
}
$this->items[$i] = $item;
}
}
}
function is_rss () {
if ( $this->feed_type == RSS ) {
return $this->feed_version;
}
else {
return false;
}
}
function is_atom() {
if ( $this->feed_type == ATOM ) {
return $this->feed_version;
}
else {
return false;
}
}
#
# return XML parser, and possibly re-encoded source
#
function create_parser($source, $out_enc, $in_enc, $detect) {
if ( substr(phpversion(),0,1) == 5) {
$parser = $this->php5_create_parser($in_enc, $detect);
}
else {
list($parser, $source) = $this->php4_create_parser($source, $in_enc, $detect);
}
if ($out_enc) {
$this->encoding = $out_enc;
xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, $out_enc);
}
return array($parser, $source);
}
#
# Instantiate an XML parser under PHP5
#
# PHP5 will do a fine job of detecting input encoding
# if passed an empty string as the encoding.
#
# All hail libxml2!
#
function php5_create_parser($in_enc, $detect) {
# by default php5 does a fine job of detecting input encodings
if(!$detect && $in_enc) {
return xml_parser_create($in_enc);
}
else {
return xml_parser_create('');
}
}
#
# Instaniate an XML parser under PHP4
#
# Unfortunately PHP4's support for character encodings
# and especially XML and character encodings sucks. As
# long as the documents you parse only contain characters
# from the ISO-8859-1 character set (a superset of ASCII,
# and a subset of UTF-8) you're fine. However once you
# step out of that comfy little world things get mad, bad,
# and dangerous to know.
#
# The following code is based on SJM's work with FoF
# @see http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
#
function php4_create_parser($source, $in_enc, $detect) {
if ( !$detect ) {
return array(xml_parser_create($in_enc), $source);
}
if (!$in_enc) {
if (preg_match('/<?xml.*encoding=[\'"](.*?)[\'"].*?>/m', $source, $m)) {
$in_enc = strtoupper($m[1]);
$this->source_encoding = $in_enc;
}
else {
$in_enc = 'UTF-8';
}
}
if ($this->known_encoding($in_enc)) {
return array(xml_parser_create($in_enc), $source);
}
# the dectected encoding is not one of the simple encodings PHP knows
# attempt to use the iconv extension to
# cast the XML to a known encoding
# @see http://php.net/iconv
if (function_exists('iconv')) {
$encoded_source = iconv($in_enc,'UTF-8', $source);
if ($encoded_source) {
return array(xml_parser_create('UTF-8'), $encoded_source);
}
}
# iconv didn't work, try mb_convert_encoding
# @see http://php.net/mbstring
if( function_exists('mb_convert_encoding')) {
$encoded_source = mb_convert_encoding($source, 'UTF-8', $in_enc );
if ($encoded_source) {
return array(xml_parser_create('UTF-8'), $encoded_source);
}
}
#
# else
#
$this->error("Feed is in an unsupported character encoding. ($in_enc) " .
"You may see strange artifacts, and mangled characters.",
E_USER_NOTICE);
return array(xml_parser_create(), $source);
}
function known_encoding($enc) {
$enc = strtoupper($enc);
if ( in_array($enc, $this->_KNOWN_ENCODINGS) ) {
return $enc;
}
else {
return false;
}
}
function error ($errormsg, $lvl=E_USER_WARNING) {
// append PHP's error message if track_errors enabled
if ( isset($php_errormsg) ) {
$errormsg .= " ($php_errormsg)";
}
if ( MAGPIE_DEBUG ) {
trigger_error( $errormsg, $lvl);
}
else {
error_log( $errormsg, 0);
}
$notices = E_USER_NOTICE|E_NOTICE;
if ( $lvl&$notices ) {
$this->WARNING = $errormsg;
} else {
$this->ERROR = $errormsg;
}
}
// magic ID function for multiple elemenets.
// can be called as static MagpieRSS::element_id()
function element_id ($el, $counter) {
return $el . (($counter > 1) ? '#'.$counter : '');
}
} // end class RSS
function map_attrs($k, $v) {
return "$k=\"$v\"";
}
// patch to support medieval versions of PHP4.1.x,
// courtesy, Ryan Currie, ryan@digibliss.com
if (!function_exists('array_change_key_case')) {
define("CASE_UPPER",1);
define("CASE_LOWER",0);
function array_change_key_case($array,$case=CASE_LOWER) {
if ($case==CASE_LOWER) {
$cmd='strtolower';
}
elseif ($case==CASE_UPPER) {
$cmd='strtoupper';
}
foreach($array as $key=>$value) {
$output[$cmd($key)]=$value;
}
return $output;
}
}