$headers = array(
    array(new TableCell('Main table title', array('colspan' => 3))),
    array('ISBN', 'Title', 'Author'),
);

$rows = array(
    array(
        '978-0521567817',
        'De Monarchia',
        new TableCell("Dante Alighieri\nspans multiple rows", array('rowspan' => 2)),
    ),
    array('978-0804169127', 'Divine Comedy'),
);

// The following works fine (when creating a regular table via the `Table` class)
$table = new Table($output);
$table->setHeaders($headers)->setRows($rows);
$table->render();

// Notice: Array to string conversion 
$io = new SymfonyStyle($input, $output);
$io->table($headers, $rows);