wangdu_wechat/vendor/maatwebsite/excel/docs/merge.md

$mergeColumn = array(

 *                  'columns' => array('A','B','C','D'),
 *                  'rows' => array(
 *                      array(2,3),
 *                      array(5,11),
 *                      .....
 *                   )
 *            );