QR_code_generator/app/Models/QrCodes/QrCodeFormat.php

<?php

namespace App\Models\QrCodes;

class QrCodeFormat
{
    public const PNG = 'png';
    public const EPS = 'eps';
    public const SVG = 'svg';

    public const TITLES = [
        self::PNG => '*.png',
        self::EPS => '*.eps',
        self::SVG => '*.svg'
    ];
}