preg_replace full words by link

function splitHtmlTextOnlyProc($s, &$curr, &$nxt){
	$t=1;

	global $ll;

	if(($curr - $nxt) == 0)return;

	$words = preg_split("/[\s,]+/", substr($s, $curr, $nxt - $curr));

	foreach($words as $k ){
		if(trim($k)=='')continue;
		$k1 = getLink($k);

		if($k != $k1){

			$count = 0;
			$kq = preg_quote($k);
			$s =  preg_replace ( "/\b" . $kq . "\b/i", $k1 , $s, -1, $count);
			//$s = str_replace($k, $k1, $s, $count);
			//$s =  preg_replace ( "/" . $k . "/", $k1 , $s, -1, $count);
			$lNxt= $nxt ;
			$nxt += (strlen($k1) - strlen($k)) * $count;
			log2("splitadd lNxt $lNxt nxt $nxt count $count k \n$k\n k1 \n$k1\n\n");
		}

	}

	return $s;

}

PHP:

this function takes a string parses it out to words, sends each word to getLink which caches words and returns a replacement a href link or the orignal word.

is this the best way to do this? is there some case where there might be a problem?

thank you