$pdocrud = new PDOCrud();
                                //Add callback function "beforeloginCallback" on before_select event
                                $pdocrud->addCallback("before_select", "beforeloginCallback");
                                echo $pdocrud->dbTable("users")->render();
                                // Available events are 
                                //This 'beforeloginCallback' function must be added on script/pdocrud.php file
                                // e.g. before data submission encrypt user password
                                function beforeloginCallback($data, $this) {
                                    $data["data"]["user_pass"]= md5($data["data"]["user_pass"]);
                                    return $data;
                                }