get('account', '')); if ($account === '') { return ''; // No payee account configured — nothing to render. } $payload = $this->spayd( $account, (float) $symbols->get('price', 0), (string) $symbols->get('currency', 'CZK'), (string) $symbols->get('message', ''), (string) $symbols->get('variable_symbol', '') ); $src = $this->image_url($payload); if ($src === '') { return ''; // Image could not be written. } return ''; } public function symbols(): array { return ['account', 'currency', 'message', 'variable_symbol']; } /** Builds a SPAYD string (Czech QR payment). '*' is the field delimiter. */ private function spayd(string $account, float $price, string $currency, string $message, string $vs): string { $parts = [ 'SPD*1.0', 'ACC:' . $account, 'AM:' . number_format($price, 2, '.', ''), 'CC:' . $currency, ]; if ($message !== '') { $parts[] = 'MSG:' . str_replace('*', ' ', $message); } if ($vs !== '') { $parts[] = 'X-VS:' . preg_replace('/\D/', '', $vs); } return implode('*', $parts); } /** * Writes the QR PNG under uploads (deduped by payload hash) and returns its * public URL, or '' if it could not be written. */ private function image_url(string $payload): string { $uploads = wp_upload_dir(); $dir = $uploads['basedir'] . '/reservair-qr'; $name = hash('sha256', $payload) . '.png'; $path = $dir . '/' . $name; if (!file_exists($path)) { wp_mkdir_p($dir); if (file_put_contents($path, $this->png($payload)) === false) { return ''; } } return $uploads['baseurl'] . '/reservair-qr/' . $name; } private function png(string $payload): string { $options = new QROptions(); $options->version = 7; $options->outputInterface = QRGdImagePNG::class; $options->scale = 4; $options->outputBase64 = false; $options->bgColor = [200, 150, 200]; return (string) (new QRCode($options))->render($payload); } }