Arman

/**
 * @var $xls \PhpOffice\PhpSpreadsheet\Writer\Xlsx
 */
$xls = $this->xls;

$('body').on('submit', '#formvac', function() {
//...
});

<?php
$maxHistory = 20;
$addId = $_GET['id'] - 1;

$lot_history = isset($_COOKIE['lot_history']) ? (array)json_decode($_COOKIE['lot_history']) : [];
$lot_history[] = $addId;
$lot_history = array_slice(array_unique($lot_history), -$maxHistory);

setcookie("lot_history", $lot_history, strtotime("+1 day"), "/");