preg_replace question

[Merlin Morgenstern <merlin_x@xxxxxxxxxxx>]

Hi there,

I am trying to replace certain words inside a text with php. 
Unfortunatelly my function is creating invalid html as output.

For example the words "beagle" and "welpen" have to be replaced inside 
this text: "süße knuffige Beagle Welpen ab sofort"

My result looks like this:
zwei süße knuffige <a href="/bsp/hunde,beagle">Beagle <a 
href="/bsp/hunde">Welpen</a></a>

The problem is, that my function is not closing the href tag before it 
starts to replace the next item.

Here is the code: 
################################################################################################
	// create internal links
	function 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);
	}
	################################################################################################I

I could not find a way to fix this and I would be happy for some help. 
Thank you in advance!

Merlin

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