每次點擊添加到購物車按鈕時，如何在會話數組中添加值？

Question

每次點擊添加購物車按鈕我傳遞一個id值並從數據庫中獲取數據，我想將它保存爲一個會話數組。

<?php session_start() ?> 
<?php require 'config.php' ?> 
<?php 
    if (isset($_POST['id'])) { 
    $sql = "SELECT product_name, product_price FROM products WHERE id=".$_POST['id']; 
    $result = $mysqli->query($sql) or die($mysqli->error); 

    $result = $result->fetch_assoc(); 

    if (isset($_SESSION['cart'])) { 
     if (isset($_SESSION['cart']['id'])) { 
      unset($_SESSION['cart']['id']); 
     } 
    } 

    $_SESSION['cart']['id'] = $result; 

    $cart = count($_SESSION['cart']); 
    //$cart = json_encode($_SESSION['cart']['id']); 

    echo $cart; 
    } 
?> 

Answer 1

嘗試這樣：

if(!isset($_SESSION['cart'])) 
    $_SESSION['cart'] = array();//Declaration of the cart 
$_SESSION['cart'][] = $result;//To add the result in cart