How to loop through properties in a flat object

There is a table contains columns like

username,settings1,settings2,settings3

username is a unique and settings1,2,3 is contain 0 or 1 values.

$query = $this->db->query("SELECT * FROM tbl_users WHERE username = 'test'");
$queryrow = $query->row();

so I want to select the row that matching to username and loop through columns and check which column contain 0's and 1's.

I can do this by writing a if statement for every column though, like

if($queryrow->settings1=="1"){
..
}

there is like 7 columns in table so instead of writing 7 if statements, any other way to do this? I'm using CodeIgniter 2.0.2

You can iterate objects

// use active record to work less and be safer
$this->db->where('username', 'test');
$query = $this->db->get('tbl_users');

foreach ($query->result() as $row)
{
    // iterate the row object
    foreach($row as $key => $item)
    {
        if($row->$key == "1")
        {
            // your code
        }
    }
}

If all you need to do in this loop is checking those values, you should do a SELECT to have only those items in $row, and avoid having "username"

$this->db->select('setting1, setting2, setting3');

Otherwise, if you want to keep username, the IF statement could be rather

if(in_array($key, array('setting1', 'setting2', 'setting3')) && $row->$key == "1")