$Result = $query->select(['LT.Title','L.Balance', 'L.Earned'])->where(['L.EmployeeID'=>Yii::$app->user->id])->from('leave L')->leftJoin('listitems LT','LT.ListItemID = L.LeaveTypeID')->all();

[1] => Array
    (
        [Title] => casual
        [Balance] => 12
        [Earned] => 12
    )