<?php
// update_selected_variation.php

// Retrieve the JSON data sent via AJAX
$data = json_decode(file_get_contents('php://input'), true);

// You can process the $data as needed, for example, store it in session

$_SESSION['selected_variation'] = $data;

var_dump($_SESSION['selected_variation']);
// You can also return a response if needed
// echo json_encode(['success' => true]);