Events Manager conditional placeholders for custom attribute

/**
* add some conditional output conditions for Events Manager
* @param string $replacement
* @param string $condition
* @param string $match
* @param object $EM_Event
* @return string
*/
function filterEventOutputCondition($replacement, $condition, $match, $EM_Event){
    if (is_object($EM_Event)) {

        switch ($condition) {

            // replace LF with HTML line breaks
            case 'nl2br':
                // remove conditional
                $replacement = preg_replace('/\{\/?nl2br\}/', '', $match);
                // process any placeholders and replace LF
                $replacement = nl2br($EM_Event->output($replacement));
                break;

            // #_ATT{Website}
            case 'has_att_yournewattribute':
                if (is_array($EM_Event->event_attributes) && !empty($EM_Event->event_attributes['yournewattribute']))
                    $replacement = preg_replace('/\{\/?has_att_yournewattribute\}/', '', $match);
                else
                    $replacement = '';
                break;

        }

    }

    return $replacement;
}

add_filter('em_event_output_condition', 'filterEventOutputCondition', 10, 4);