$value) { if ($key !== 'submit') { $data_to_save[$key] = $value; } } $data_to_save['device_id'] = trim(file_get_contents('/sys/class/dmi/id/product_uuid')); // Save if no errors occurred if (empty($errors)) { if (file_put_contents($json_file, json_encode($data_to_save, JSON_PRETTY_PRINT)) === false) { $errors[] = "Failed to write to file. Check permissions."; } } if (!empty($errors)) { $error_message = implode("
", $errors); } else { // Redirect to prevent form resubmission on refresh header("Location: " . $_SERVER['PHP_SELF']); exit; } } // --- 2. Load Data for Display --- $saved_data = []; if (file_exists($json_file)) { $json_content = file_get_contents($json_file); $saved_data = json_decode($json_content, true) ?? []; } function getValue($data, $key) { return $data[$key] ?? ''; } include 'header.php'; ?>

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