SimpleXMLElement occasionally fails to parse gb2312 or big5 RSS feeds

I use the following code to get rss and parse it, but the code  
occasionally have issues with gb2312 or big-5 encoded feeds, and fails to  
parse them. However other times may appear just okay. Any thoughts? Maybe  
SimpleXMLElement is simply not meant for other language encodings...

		$page = file_get_contents($rss);
		try {
			$feed = new SimpleXMLElement($page);


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