padua-csv-parse/app/Http/Controllers/FileUpload.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Helper\TransactionCodeHelper;
use DateTime;

class FileUpload extends Controller
{
    /**
     * Return the csv-upload view on GET request to /
     *
     * @return \Illuminate\Contracts\View\View|\Illuminate\Contracts\View\Factory
     */
    public function createForm()
    {
        return view('csv-upload');
    }

    /**
     * Parse and return the CSV data on POST request to /
     *
     * @param $request Request
     * @return \Illuminate\Http\RedirectResponse
     */
    public function fileUpload(Request $request)
    {
        $request->validate([
            'file' => 'required|mimes:csv|max:4098'
        ]);


        if (!$request->file()) {
            return back();
        }

        $result = [];

        $csv_contents = $request->file('file')->getContent();
        $rows = str_getcsv($csv_contents, PHP_EOL);

        $headers = null;

        foreach ($rows as $index => $row) {
            $columns = str_getcsv($row, ',');

            if ($index === 0) {
                $headers = (object) [
                    'Date',
                    'Transaction Number',
                    'Transaction Valid',
                    'Customer Number',
                    'Reference',
                    'Amount',
                ];
                continue;
            }

            $date = new DateTime($columns[0] ?? null);

            $valid_transaction = TransactionCodeHelper::verifyKey($columns[1]) ? 'Yes' : 'No'; $amount = sprintf(
                '$%s',
                number_format((float) ((int) $columns[4] / 100) ?? null, 2, '.', ''),
            );


            $result[$index] = (object) [
                $date->format('Y/m/d h:i a'),
                $columns[1] ?? null,
                $valid_transaction,
                $columns[2] ?? null,
                $columns[3] ?? null,
                $amount,
            ];
        }

        usort($result, function ($a, $b) {
            return strtotime($a->{0}) < strtotime($b->{0});
        });

        $result[0] = $headers;

        return back()
            ->with('results', (object) $result);
    }
}