PHPExcel 合并拆分单元格

<?php
    require 'vendor/autoload.php';
    $phpexcel = new PHPExcel();
    $phpwriter = new PHPExcel_Writer_Excel2007($phpexcel);  // 高版本扩展名 xlsx
    
    /*
        合并单元格
        $phpexcel->getActiveSheet()->mergeCells('A1:A10');
        
        分离单元格
        $phpexcel->getActiveSheet()->unmergeCells('A28:B28');
    */
    
    // $phpexcel->getActiveSheet()->mergeCells('A1:A10');
    $phpexcel->getActiveSheet()->unmergeCells('A1:A10');
    $phpwriter->save('5.xlsx');