Column merging

Merging cells

To merge a range of cells, use ->mergeCells($range).

$sheet->mergeCells('A1:E1');

Merging columns and rows

To merge columns and rows, use ->setMergeColumn($array).

$sheet->setMergeColumn(array(
    'columns' => array('A','B','C','D'),
    'rows' => array(
        array(2,3),
        array(5,11),
    )
));