MailCollector::getNumberOfActiveMailCollectors PHP Method

    static function getNumberOfActiveMailCollectors()
    {
        global $DB;
        $query = "SELECT COUNT(*) AS cpt\n                FROM `glpi_mailcollectors`\n                WHERE `is_active` = 1";
        $result = $DB->query($query);
        return $DB->result($result, 0, 'cpt');
    }

 /**
  * Get footer to add to content
  **/
 function getContentFooter()
 {
     if (MailCollector::getNumberOfActiveMailCollectors()) {
         return self::FOOTERTAG . ' ' . __('To answer by email, write under this line') . ' ' . self::FOOTERTAG;
     }
     return '';
 }