QR code with a centre logo

<?php

namespace App\Qr;

use BaconQrCode\Renderer\Color\Rgb;
use BaconQrCode\Renderer\Image\SvgImageBackEnd;
use BaconQrCode\Renderer\ImageRenderer;
use BaconQrCode\Renderer\RendererStyle\Fill;
use BaconQrCode\Renderer\RendererStyle\RendererStyle;
use BaconQrCode\Writer;
use InvalidArgumentException;

final class QrWithLogo
{
    /** @param string $logoDataUri e.g. data:image/png;base64,... (null for a plain code) */
    public static function svg(string $content, ?string $logoDataUri = null, int $size = 512, float $logoRatio = 0.22): string
    {
        // Level H repairs ~30% damage, which is what makes a covered centre scannable.
        $style = new RendererStyle(
            $size, 2, null, null,
            Fill::uniformColor(new Rgb(255, 255, 255), new Rgb(17, 24, 39))
        );
        $writer = new Writer(new ImageRenderer($style, new SvgImageBackEnd()));
        $svg = $writer->writeString($content, 'UTF-8', \BaconQrCode\Common\ErrorCorrectionLevel::H());

        if ($logoDataUri === null) {
            return $svg;
        }
        if (! preg_match('#^data:image/(png|jpeg|svg\+xml);base64,[A-Za-z0-9+/=]+$#', $logoDataUri)) {
            throw new InvalidArgumentException('Logo must be a base64 data URI.');
        }
        // Keep the logo under ~5% of the code area (0.22 side ratio) so scanners still decode it.
        $logo = $size * min($logoRatio, 0.25);
        $plate = $logo * 1.25;
        $x = ($size - $plate) / 2;
        $y = ($size - $plate) / 2;
        $overlay = sprintf(
            '<rect x="%1$.1f" y="%1$.1f" width="%2$.1f" height="%2$.1f" rx="%3$.1f" fill="#fff"/>'
            .'<image x="%4$.1f" y="%4$.1f" width="%5$.1f" height="%5$.1f" href="%6$s" preserveAspectRatio="xMidYMid meet"/>',
            $x, $plate, $plate * 0.18, ($size - $logo) / 2, $logo, htmlspecialchars($logoDataUri, ENT_QUOTES)
        );

        return str_replace('</svg>', $overlay.'</svg>', $svg);
    }
}