Unmerge Cells In Excel Files In PHP Using PHPSpreadSheet

{
    "require": {
        "phpoffice/phpspreadsheet": "^1.3"
    }
}

$ composer install

<?php

// Autoload dependencies
require 'vendor/autoload.php';

// Import the IOFactory class
use \PhpOffice\PhpSpreadsheet\IOFactory;

// Import the Xlsx writer class
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;

// Full path of the file to be indentified
$inputFileName = 'merge-cells-in-xlsx-files.xlsx';

// Identify the file type using the IOFactory object
$inputFileType = IOFactory::identify($inputFileName);

// Create the reader object
$reader = IOFactory::createReader($inputFileType);

// Load the file to read
$spreadsheet = $reader->load($inputFileName);

// Retrieve the current active worksheet
$sheet = $spreadsheet->getActiveSheet();

// Unmerge cells from A1 to D5
$sheet->unmergeCells('A1:D5');

// Write a new .xlsx file
$writer = new Xlsx($spreadsheet);

// Save the new .xlsx file
$writer->save('unmerge-cells-in-xlsx-files.xlsx');

$ php unmerge-cells-in-xlsx-files.php