function myfunction(){
    $query ="SELECT * from tbl_data";
    $stmt = $this->getConnection()->prepare($query);
    $stmt->execute();

    foreach ($stmt->fetchAll() as $value) {

        //custom value
        $customval = 1;

        $array = array([
            "ID"                => $value['ID'],
            "name"              => $value['name'],
            "staus"             => $value['status'],
            "customval"         => $customval,
        ]);
    }

    return $array;
}