<?php class FeedParser { private $doc; private $error; private $libxml_errors = array(); private $items; private $link; private $title; private $type; private $xpath; const FEED_RDF = 0; const FEED_RSS = 1; const FEED_ATOM = 2; function __construct($data) { libxml_use_internal_errors(true); libxml_clear_errors(); $this->doc = new DOMDocument(); $this->doc->loadXML($data); mb_substitute_character("none"); $error = libxml_get_last_error(); if ($error) { foreach (libxml_get_errors() as $error) { if ($error->level == LIBXML_ERR_FATAL) { if(!isset($this->error)) //currently only the first error is reported $this->error = $this->format_error($error); $this->libxml_errors [] = $this->format_error($error); } } } libxml_clear_errors(); $this->items = array(); } function init() { $root = $this->doc->firstChild; $xpath = new DOMXPath($this->doc); $xpath->registerNamespace('atom', 'http://www.w3.org/2005/Atom'); $xpath->registerNamespace('atom03', 'http://purl.org/atom/ns#'); $xpath->registerNamespace('media', 'http://search.yahoo.com/mrss/'); $xpath->registerNamespace('rdf', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'); $xpath->registerNamespace('slash', 'http://purl.org/rss/1.0/modules/slash/'); $xpath->registerNamespace('dc', 'http://purl.org/dc/elements/1.1/'); $xpath->registerNamespace('content', 'http://purl.org/rss/1.0/modules/content/'); $xpath->registerNamespace('thread', 'http://purl.org/syndication/thread/1.0'); $this->xpath = $xpath; $root = $xpath->query("(//atom03:feed|//atom:feed|//channel|//rdf:rdf|//rdf:RDF)"); if (!empty($root) && $root->length > 0) { $root = $root->item(0); if ($root) { switch (mb_strtolower($root->tagName)) { case "rdf:rdf": $this->type = $this::FEED_RDF; break; case "channel": $this->type = $this::FEED_RSS; break; case "feed": case "atom:feed": $this->type = $this::FEED_ATOM; break; default: if( !isset($this->error) ){ $this->error = "Unknown/unsupported feed type"; } return; } } switch ($this->type) { case $this::FEED_ATOM: $title = $xpath->query("//atom:feed/atom:title")->item(0); if (!$title) $title = $xpath->query("//atom03:feed/atom03:title")->item(0); if ($title) { $this->title = $title->nodeValue; } $link = $xpath->query("//atom:feed/atom:link[not(@rel)]")->item(0); if (!$link) $link = $xpath->query("//atom:feed/atom:link[@rel='alternate']")->item(0); if (!$link) $link = $xpath->query("//atom03:feed/atom03:link[not(@rel)]")->item(0); if (!$link) $link = $xpath->query("//atom03:feed/atom03:link[@rel='alternate']")->item(0); if ($link && $link->hasAttributes()) { $this->link = $link->getAttribute("href"); } $articles = $xpath->query("//atom:entry"); if (empty($articles) || $articles->length == 0) $articles = $xpath->query("//atom03:entry"); foreach ($articles as $article) { array_push($this->items, new FeedItem_Atom($article, $this->doc, $this->xpath)); } break; case $this::FEED_RSS: $title = $xpath->query("//channel/title")->item(0); if ($title) { $this->title = $title->nodeValue; } $link = $xpath->query("//channel/link")->item(0); if ($link) { if ($link->getAttribute("href")) $this->link = $link->getAttribute("href"); else if ($link->nodeValue) $this->link = $link->nodeValue; } $articles = $xpath->query("//channel/item"); foreach ($articles as $article) { array_push($this->items, new FeedItem_RSS($article, $this->doc, $this->xpath)); } break; case $this::FEED_RDF: $xpath->registerNamespace('rssfake', 'http://purl.org/rss/1.0/'); $title = $xpath->query("//rssfake:channel/rssfake:title")->item(0); if ($title) { $this->title = $title->nodeValue; } $link = $xpath->query("//rssfake:channel/rssfake:link")->item(0); if ($link) { $this->link = $link->nodeValue; } $articles = $xpath->query("//rssfake:item"); foreach ($articles as $article) { array_push($this->items, new FeedItem_RSS($article, $this->doc, $this->xpath)); } break; } if ($this->title) $this->title = trim($this->title); if ($this->link) $this->link = trim($this->link); } else { if( !isset($this->error) ){ $this->error = "Unknown/unsupported feed type"; } return; } } function format_error($error) { if ($error) { return sprintf("LibXML error %s at line %d (column %d): %s", $error->code, $error->line, $error->column, $error->message); } else { return ""; } } // libxml may have invalid unicode data in error messages function error() { return UConverter::transcode($this->error, 'UTF-8', 'UTF-8'); } // WARNING: may return invalid unicode data function errors() { return $this->libxml_errors; } function get_link() { return clean($this->link); } function get_title() { return clean($this->title); } function get_items() { return $this->items; } function get_links($rel) { $rv = array(); switch ($this->type) { case $this::FEED_ATOM: $links = $this->xpath->query("//atom:feed/atom:link"); foreach ($links as $link) { if (!$rel || $link->hasAttribute('rel') && $link->getAttribute('rel') == $rel) { array_push($rv, clean(trim($link->getAttribute('href')))); } } break; case $this::FEED_RSS: $links = $this->xpath->query("//atom:link"); foreach ($links as $link) { if (!$rel || $link->hasAttribute('rel') && $link->getAttribute('rel') == $rel) { array_push($rv, clean(trim($link->getAttribute('href')))); } } break; } return $rv; } }