Close open tags and remove certain html for CDATA inclusion

gistfile1.php

//from http://codesnippets.joyent.com/posts/show/959
function close_dangling_tags($html){
#put all opened tags into an array
	preg_match_all("#<([a-z]+)( .*)?(?!/)>#iU",$html,$result);
	$openedtags=$result[1];
	
	#put all closed tags into an array
	preg_match_all("#</([a-z]+)>#iU",$html,$result);
	$closedtags=$result[1];
	$len_opened = count($openedtags);
	# all tags are closed
	if(count($closedtags) == $len_opened){
		return $html;
	}
	
	$openedtags = array_reverse($openedtags);
	# close tags
	for($i=0;$i < $len_opened;$i++) {
		if (!in_array($openedtags[$i],$closedtags)){
			$html .= '</'.$openedtags[$i].'>';
		} else {
			unset($closedtags[array_search($openedtags[$i],$closedtags)]);
		}
	}
	return $html;
}

//remove html and wrap remaining in CDATA
function removeHTML($string) {
	$string = strip_tags($string, '<p><span class="intro"><h3><h4><h5><li>');		
	$string = close_dangling_tags($string);
	return '<![CDATA['.$string.']]>';		
}