Restarting a page part-way through

Hi, Sometimes (e.g. when an error occurs), I want to remove the output from my current page and start again. However, I can't find a way to do this in PHP. I've tried a <meta "refresh"> technique, which will work to go to another page. However, I want to provide the data for the "new" page from the current script - i.e. the client doesn't do the redirect but reads the text from the current page instead. Is there any way to do this using PHP? Thanks, Chris.