PHP

PhpSpreadSheet select sheet

//By sheet position index
$spreadsheet->getSheet(0)
//By sheet name
$spreadsheet->getSheetByName('Sheet 1')

phpspreadsheet

<?php

require 'vendor/autoload.php';

use PhpOfficePhpSpreadsheetSpreadsheet;
use PhpOfficePhpSpreadsheetWriterXlsx;

$spreadsheet = new Spreadsheet();
$sheet = $spreadsheet->getActiveSheet();
$sheet->setCellValue('A1', 'Hello World !');

$writer = new Xlsx($spreadsheet);
$writer->save('hello world.xlsx');