str_replace problem

Hi all. I'm trying to do a little code snippets page for a site I am working on. I figured it would be simple enough. I would do a str_replace and replace the various html codes with the ascii eqivulant. Unfortunately, it is not working as expected. Can anyone help with this? This is what I am using. $snippetCode = str_replace("\n", "<br>", $snippet['snippetCode']); $snippetCode = str_replace("<", "&gt;", $snippetCode); $snippetCode = str_replace(">", "&lt;", $snippetCode); $snippetCode = str_replace("&", "&amp;", $snippetCode); This is what is in $snippet['snippetCode']. ?><pre><? print_r($ArrayName); ?></pre><? This is what is showing on the web page. ?&lt;&gt;pre&lt;&gt;? print_r($ArrayName); ?&lt;&gt;/pre&lt;&gt;? If anyone can help, it would be appreciated. Also, if you have a quick and dirty code colorer, I would appreciate that. Thanks Chris