Hot to replace words with preg_replace without duplicates

[Merlin Morgenstern <merlin_x@xxxxxxxxxxx>]

Hi there,

I want to create a function which will replace certain words out of a 
text with internal links. That works so far, but if I have two matches, 
I end up with invalid html code.

Example:
Welpen 			/hunde
Chihuahua Welpen 	/hunde,chihuahua

function seo_internal_links($str, $links, $limit) {
	foreach($links AS $link){
		$pattern[$k] = "~\b($link[phrase])\b~i";
		$replace[$k] = '<a href="'.$link[link].'">\\1</a>';
		$k++;
	}
	return preg_replace($pattern,$replace,$str, $limit);
}

seo_internal_links($ad[text], $seo_internal_links, $limit = 1);

This will result in:
<a href="//hunde,chihuahua">Chihuahua <a href="/hunde">Welpen</a></a>

Has somebody an idea on how to avoid this? I would also like to limit 
the amount of hits, but the limit in preg_replace accounts only for 
unique words, not the whole array.

Thank you for any hint,

Merlin

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