<?php
// (A) LOAD PHPSPREADSHEET
require "vendor/autoload.php";
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;

// (B) CREATE A NEW SPREADSHEET
$spreadsheet = new Spreadsheet();

// (C) GET WORKSHEET
$sheet = $spreadsheet->getActiveSheet();
$sheet->setTitle("Arr");

// (D) DATA ARRAY TO WORKSHEET
$data = [
  ["Name", "Email", "Tel"],
  ["Jon Doe", "jon@doe.com", "123456"],
  ["Joe Doe", "joe@doe.com", "234567"],
  ["Joy Doe", "joy@doe.com", "345678"],
];
$cRow = 0; $cCol = 0;
foreach ($data as $row) {
  $cRow ++; // NEXT ROW
  $cCol = 65; // RESET COLUMN "A"
  foreach ($row as $cell) {
    $sheet->setCellValue(chr($cCol) . $cRow, $cell);
    $cCol++;
  }
}

// (E) OUTPUT
$writer = new Xlsx($spreadsheet);
$writer->save("demoB.xlsx");
echo "OK!";