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<?php
session_start();
include('dbcon.php');
if (!isset($_SESSION['session_id'])) {
$_SESSION['session_id'] = session_create_id();
}
$user_id = isset($_SESSION['id']) ? $_SESSION['id'] : null;
$session_id = $_SESSION['session_id'];
if (!isset($_GET['id']) || !isset($_GET['action'])) {
header("Location: add-to-cart.php");
exit;
}
$cart_item_id = intval($_GET['id']);
$action = $_GET['action'];
if ($user_id) {
$stmt = $conn->prepare("SELECT quantity FROM cart_items WHERE id = ? AND user_id = ?");
$stmt->bind_param("ii", $cart_item_id, $user_id);
} else {
$stmt = $conn->prepare("SELECT quantity FROM cart_items WHERE id = ? AND session_id = ?");
$stmt->bind_param("is", $cart_item_id, $session_id);
}
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
$item = $result->fetch_assoc();
$current_quantity = (int)$item['quantity'];
if ($action === 'plus') {
$new_quantity = $current_quantity + 1;
} elseif ($action === 'minus' && $current_quantity > 1) {
$new_quantity = $current_quantity - 1;
} else {
$new_quantity = $current_quantity;
}
if ($user_id) {
$update_stmt = $conn->prepare("UPDATE cart_items SET quantity = ? WHERE id = ? AND user_id = ?");
$update_stmt->bind_param("iii", $new_quantity, $cart_item_id, $user_id);
} else {
$update_stmt = $conn->prepare("UPDATE cart_items SET quantity = ? WHERE id = ? AND session_id = ?");
$update_stmt->bind_param("iis", $new_quantity, $cart_item_id, $session_id);
}
$update_stmt->execute();
$update_stmt->close();
}
$stmt->close();
$conn->close();
header("Location: add-to-cart.php");
exit;