Try using the following:
<?php
class modUno {
public static function due() {
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query->select($db->quoteName('userid') . 'AS' . $db->quoteName('memTotal'))
->from($db->quoteName('#__session'))
->order('RAND()')
->setLimit(1);
$db->setQuery($query);
return $db->loadResult();
}
public static function tre() {
$risultato = due();
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query->select($db->quoteName('avatar'))
->from($db->quoteName('#__comprofiler'))
->where($db->quoteName('id') . ' = ' . $db->quote($risultato));
$db->setQuery($query);
return $db->loadResult();
}
public static function quattro() {
$risultato = due();
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query->select($db->quoteName('cb_skipe'))
->from($db->quoteName('#__comprofiler'))
->where($db->quoteName('id') . ' = ' . $db->quote($risultato));
$db->setQuery($query);
return $db->loadResult();
}
}
?>
I have made some modifications however have not tested it so please let me know if it works or not.