Edit cart.php

cart.php

@@ -11,8 +11,8 @@ if (!isset($_SESSION['user_id'])) {
 // ✅ เพิ่มสินค้าเข้า `cart`
 if (isset($_GET['add'])) {
     $stmt = $conn->prepare("
-        INSERT INTO cart (users_id, products_id, qty)
-        VALUES (?, ?, 1)
+        INSERT INTO cart (id, users_id, products_id, qty)
+        VALUES (NULL, ?, ?, 1)
         ON DUPLICATE KEY UPDATE qty = qty + 1
     ");
     $stmt->execute([$_SESSION['user_id'], $_GET['add']]);
@@ -20,6 +20,23 @@ if (isset($_GET['add'])) {
     exit;
 }
 
+// ✅ อัปเดตจำนวนสินค้า
+if (isset($_GET['update']) && isset($_GET['qty'])) {
+    $qty = max(1, intval($_GET['qty'])); // ป้องกันค่าติดลบ
+    $stmt = $conn->prepare("UPDATE cart SET qty = ? WHERE users_id = ? AND products_id = ?");
+    $stmt->execute([$qty, $_SESSION['user_id'], $_GET['update']]);
+    header("Location: cart.php");
+    exit;
+}
+
+// ✅ ลบสินค้าออกจาก `cart`
+if (isset($_GET['remove'])) {
+    $stmt = $conn->prepare("DELETE FROM cart WHERE users_id = ? AND products_id = ?");
+    $stmt->execute([$_SESSION['user_id'], $_GET['remove']]);
+    header("Location: cart.php");
+    exit;
+}
+
 // ✅ ดึงข้อมูลจาก `cart` และ `products`
 $stmt = $conn->prepare("
     SELECT cart.*, products.name, products.price 
@@ -36,8 +53,6 @@ $cart_items = $stmt->fetchAll(PDO::FETCH_ASSOC);
 <?php if (empty($cart_items)): ?>
     <p>ไม่มีสินค้าในตะกร้า</p>
 <?php else: ?>
-
-    
     <table border="1" cellpadding="5" cellspacing="0">
         <tr>
             <th>User ID</th>
@@ -56,12 +71,12 @@ $cart_items = $stmt->fetchAll(PDO::FETCH_ASSOC);
             $total += $subtotal;
         ?>
             <tr>
-            <td><?= $item['users_id'] ?></td>
+                <td><?= $item['users_id'] ?></td>
                 <td><?= $item['products_id'] ?></td>
                 <td><?= htmlspecialchars($item['name']) ?></td>
                 <td><?= number_format($item['price'], 2) ?> บาท</td>
                 <td>
-                    <a href="cart.php?update=<?= $item['products_id'] ?>&qty=<?= $item['qty'] - 1 ?>">➖</a>
+                    <a href="cart.php?update=<?= $item['products_id'] ?>&qty=<?= max(1, $item['qty'] - 1) ?>">➖</a>
                     <?= $item['qty'] ?>
                     <a href="cart.php?update=<?= $item['products_id'] ?>&qty=<?= $item['qty'] + 1 ?>">➕</a>
                 </td>
@@ -70,7 +85,7 @@ $cart_items = $stmt->fetchAll(PDO::FETCH_ASSOC);
             </tr>
         <?php endforeach; ?>
         <tr>
-            <td colspan="4" align="right"><strong>ยอดรวมทั้งหมด:</strong></td>
+            <td colspan="5" align="right"><strong>ยอดรวมทั้งหมด:</strong></td>
             <td colspan="2"><strong><?= number_format($total, 2) ?> บาท</strong></td>
         </tr>
     </table>