public static function edit($vars, $files)
 {
     $db = DB::get();
     $row = $db->prepare("UPDATE empresas SET name = :name , img = :img WHERE id = :id");
     $row->bindParam(':name', $vars["nombre"], PDO::PARAM_STR);
     $row->bindParam(':img', !empty($files["empresa"]["name"]) ? $files["empresa"]["name"] : $vars["old-image"], PDO::PARAM_STR);
     $row->bindParam(':id', $vars["empresa-id"], PDO::PARAM_STR);
     $tmp_filename = $files["empresa"]["tmp_name"];
     $dir = "../resources/images/";
     if ($row->execute()) {
         if (!empty($files["empresa"]["name"])) {
             move_uploaded_file($tmp_filename, $dir . $files["empresa"]["name"]);
         }
         self::$success = "Empresa guardada correctamente";
     }
 }