roundcubemail/program/lib/Roundcube/rcube_imap.php
public function get_quota($folder = null)
    {
        if ($this->get_capability('QUOTA') && $this->check_connection()) {
            return $this->conn->getQuota($folder);
        }

        return false;
    }
public function get_quota($folder = null)
    {
        if ($this->get_capability('QUOTA') && $this->check_connection()) {
            return $this->conn->getQuota($folder);
        }

        return false;
    }
public function get_quota ( $ folder = null ) { if ( $ this -> get_capability ( 'QUOTA' ) && $ this -> check_connection ( ) ) { return $ this -> conn -> getQuota ( $ folder ) ; } return false ; }
Get mailbox quota information

@param string $folder Folder name

@return mixed Quota info or False if not supported
Get mailbox quota information