static function deleteStockById($stockId)
 {
     $stock = StockDBUtils::getStockById($stockId);
     ImageUtils::deleteImageById($stock->image_id);
     StockDBUtils::deleteStockById($stockId);
 }
<?php

require_once __DIR__ . '/wp-load.php';
require_once ABSPATH . WPINC . '/lib/utils/db/class-stock-db-utils.php';
require_once ABSPATH . WPINC . '/lib/utils/db/class-image-db-utils.php';
require_once ABSPATH . WPINC . '/lib/helper/class-request-helper.php';
require_once ABSPATH . WPINC . '/lib/utils/class-template-utils.php';
if (!is_user_logged_in()) {
    wp_redirect(home_url());
    exit;
}
$stockId = RequestHelper::getParameter("stock_id");
$stock = null;
if ($stockId) {
    $stock = StockDBUtils::getStockById($stockId);
}
$data = ["stock" => $stock];
TemplateUtils::includeTemplate(get_template_directory() . '/page-templates/stock-form.php', $data);
<?php

require_once __DIR__ . '/wp-load.php';
require_once ABSPATH . WPINC . '/lib/helper/class-request-helper.php';
require_once ABSPATH . WPINC . '/lib/validator/class-stock-form-validator.php';
require_once ABSPATH . WPINC . '/lib/utils/class-image-utils.php';
require_once ABSPATH . WPINC . '/lib/utils/db/class-stock-db-utils.php';
if (!is_user_logged_in()) {
    wp_redirect(home_url());
    exit;
}
$stockInfo = RequestHelper::getStockInfoFromRequest();
if (StockFormValidator::validateEditStockParameters($stockInfo)) {
    $stock = StockDBUtils::getStockById($stockInfo[Stock::ID_FIELD]);
    $imageId = $stock->image_id;
    if ($stock && StockFormValidator::validateStockAvatar($stockInfo)) {
        $image = ImageUtils::createImageFromRequestParameters($stockInfo);
        if ($image) {
            ImageUtils::deleteImageById($stock->image_id);
            $imageId = $image->image_id;
        }
    }
    StockDBUtils::updateStockById($stockInfo, $imageId, $stock->stock_id);
}
wp_redirect(get_site_url() . '/stocks');
exit;