Utente connesso o loggato

[whisher]

diciamo che mi serve sapere se uno specifico utente è online

Una cosa di questo genere:

<?php 
class RegisteredIsOnline extends getTables
{
    var $__DB;
    var $__registeredOnLineNo;
    var $__registeredOnLineName;
    function RegisteredIsOnline(&$db)
    {
        (is_object($db))?$this->__DB = &$db:exit('Could not connect');
        parent::getTables();
        $this->__registeredOnLineNo = 0;
        $this->__registeredOnLineName = array();
        $this->refresh();
    }
    function getNumber() 
    {
        return $this->__registeredOnLineNo;
    }
    function printNumber($singular,$plural) 
    {
        if($this->getNumber() == 0)
        {
            return $plural.$this->getNumber();
        }
        elseif($this->getNumber() == 1) 
        {
               return $singular.$this->getNumber();
        }
        else
        {
            return $plural.$this->getNumber();
        }
    }
    function getName() 
    {
        return $this->__registeredOnLineName;
    }
    function printName() 
    {
        return $this->getName();
    }
    function refresh() 
    {
        $query = "SELECT {$this->__tableName['user']['username']}
                  FROM {$this->__tableName['user']['table']} 
                  WHERE {$this->__tableName['user']['confirm']} = '1'  
                  AND {$this->__tableName['user']['is_online']} = '1'";
        $result = $this->__DB->performQuery($query);
        $this->__registeredOnLineNo = $result->getNumRows();
        while($row = $result->fetchObject())
        {
            $this->__registeredOnLineName[] = $row->user_name;
        }
    }
}

?>