Use the package manager composer to install SimpleConvert.
composer require codebreaker/simpleconvert
require_once './vendor/autoload.php';
$var = (object) [
"result" => $response, # Fetch Object e.g., $response = $con->query($query);
];
$convert = new \SimpleConvert\SimpleConvert($var); # Pass Argument Must Be Object
$convert->xls('filename.xls',true); # filename and download
$convert->xls(); # view in browser