/*
 * Usage {coalesce ...=... assign='...'}
 * Returns the first value of all parameters (except 'assign') that is not empty.
 * If 'assign' specified, sets Smarty variable. Otherwise prints.
 */

foreach ($params as $name => $value) {
    if ($name != 'assign' && !empty($value)) {
        if ($params['assign']) {
            cmsms()->GetSmarty()->assign($params['assign'], $value);
        } else {
            echo $value;
        }
    }
}