embeed medium - create export excel with phpspreadsheet

Ratingexcel.php

<?php if( ! defined('BASEPATH')) exit('No direct script access allowed');

use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
class Ratingexcel extends CI_controllers
{
  public function index()
    {
        $spreadsheet = new Spreadsheet();
        $sheet = $spreadsheet->getActiveSheet();

        # membuat title data
        $sheet->setCellValue('A1', 'No');
        $sheet->setCellValue('B1', 'Bintang');
        $sheet->setCellValue('C1', 'Waktu');
        $sheet->setCellValue('D1', 'Catatan');

        # membuat style jadi center antara kanan & kiri
        $sheet->getStyle('A1:D1')->getAlignment()->setHorizontal(\PhpOffice\PhpSpreadsheet\Style\Alignment::VERTICAL_CENTER);
        $sheet->getStyle('A')->getAlignment()->setHorizontal(\PhpOffice\PhpSpreadsheet\Style\Alignment::VERTICAL_CENTER);
        $sheet->getStyle('B')->getAlignment()->setHorizontal(\PhpOffice\PhpSpreadsheet\Style\Alignment::VERTICAL_CENTER);
        
        # membuat kolom waktu & catatan menjadi auto width / lebar mengikuti content
        $sheet->getColumnDimension('C')->setAutoSize(true);
        $sheet->getColumnDimension('D')->setAutoSize(true);

        # contoh data yang akan di export
        $records = array(
            [
                "id"=> "1",
                "rating"=> "4",
                "message"=> "rating 4",
                "created_at"=> "2022-07-15 08:41:19",
            ],
            [

                "id"=> "2",
                "rating"=> "5",
                "message"=> "Bagus kak",
                "created_at"=> "2022-08-09 16:12:36",
            ]
        );

        $initCell = 2; # untuk increment index cell
        $no = 1; # untuk kolom nomor
        foreach ($records as $record) {
            $sheet->setCellValue("A{$initCell}", $no);
            $sheet->setCellValue("B{$initCell}", $record["rating"]);
            $sheet->setCellValue("C{$initCell}", $record["created_at"]);
            $sheet->setCellValue("D{$initCell}", $record["message"]);

            $initCell++;
            $no++;
        }
        
        $writer = new Xlsx($spreadsheet);

        # membuat nama file
        $fileName = "Generate on ".date("Y-m-d H:i:s");
        
        # menyimpan di root project codeigniter
        $writer->save("./{$fileName}.xlsx");
    }
}