// Builds a URL based on whether it's running on IIS (dev, which is funny with URL rewrites) or Apache (production, which has different DB
// settings, etc)

function b_url($topic = null, $ctype = null, $cid = null) {
    if (DEV) {
        $base = '?';
        if ($topic) {
            return $base . "topic=$topic";
        }
        if ($topic && $ctype) {
            return $base . "topic=$topic&ctype=$ctype";
        }
        if ($topic && $ctype && $cid) {
            return $base . "topic=$topic&ctype=$ctype&cid=$cid";
        }
        return $base;
    } else {
        $base = '/';
        if ($topic) {
            return $base . "$topic";
        }
        if ($topic && $ctype) {
            return $base . "$topic/$ctype";
        }
        if ($topic && $ctype && $cid) {
            return $base . "$topic/$ctype/$cid";
        }
        return $base;
    }
}