Rewriting dynamic URLs into friendly URLs

$urlPatterns = array(
    '~'.preg_quote(BASE_DIR).'([^\.]+)\.php(\?([0-9a-zA-Z]+[^#"\']*))?~i',
);

ob_start();

#And in the global unloading script:

$pageContents = ob_get_contents();
ob_end_clean();
echo preg_replace_callback($urlPatterns,'urlRewriteCallback',$pageContents);


function urlRewriteCallback($match) {
    $extra = '';
    if ($match[3]) {
        $params = explode('&', $match[3]);
        if ($params[0] == '') array_shift($params);
        foreach ($params as $param) {
            $paramEx = explode('=', $param);
            $extra .= $paramEx[0].'/'.$paramEx[1].'/';
        }
        }
        return BASE_DIR.$match[1].'/'.$extra;
    } 1    function urlRewriteCallback($match) {
    $extra = '';
    if ($match[3]) {
        $params = explode('&', $match[3]);
        if ($params[0] == '') array_shift($params);
        foreach ($params as $param) {
            $paramEx = explode('=', $param);
            $extra .= $paramEx[0].'/'.$paramEx[1].'/';
        }
        }
        return BASE_DIR.$match[1].'/'.$extra;
    }

http://agachi.name/weblog/archives/2005/01/30/rewriting-dynamic-urls-into-friendly-urls.htm