dolibarr/htdocs/variants/ajax/getCombinations.php

<?php
/* Copyright (C) 2016	Marcos García	<marcosgdf@gmail.com>
 * Copyright (C) 2022   Open-Dsi		<support@open-dsi.fr>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

if (!defined('NOTOKENRENEWAL')) {
	define('NOTOKENRENEWAL', '1');
}
if (!defined('NOREQUIREMENU')) {
	define('NOREQUIREMENU', '1');
}
if (!defined('NOREQUIREHTML')) {
	define('NOREQUIREHTML', '1');
}
if (!defined('NOREQUIREAJAX')) {
	define('NOREQUIREAJAX', '1');
}
if (!defined('NOREQUIRESOC')) {
	define('NOREQUIRESOC', '1');
}

// Load Dolibarr environment
require '../../main.inc.php';
require_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
require_once DOL_DOCUMENT_ROOT.'/variants/class/ProductCombination.class.php';

// Security check
if (!isModEnabled('variants')) {
	accessforbidden('Module not enabled');
}
if ($user->socid > 0) { // Protection if external user
	accessforbidden();
}
$result = restrictedArea($user, 'variants');


/*
 * View
 */

top_httphead('application/json');

$id = GETPOST('id', 'int');

if (!$id) {
	print json_encode(array(
		'error' => 'ID not set'
	));
	exit();
}

$product = new Product($db);

if ($product->fetch($id) < 0) {
	print json_encode(array(
		'error' => 'Product not found'
	));
}

$prodcomb = new ProductCombination($db);

echo json_encode($prodcomb->getUniqueAttributesAndValuesByFkProductParent($product->id));