From 4bd1286f1cb5cd80f884c605ffbc69282bf34fab Mon Sep 17 00:00:00 2001
From: Fabian Schieder <fabian.schieder.1010@gmail.com>
Date: Mon, 30 Mar 2026 19:46:38 +0200
Subject: [PATCH] Add 404 error handling for invalid product IDs in
 productpage.php

---
 productpage.php | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/productpage.php b/productpage.php
index 1501ea0..072db54 100644
--- a/productpage.php
+++ b/productpage.php
@@ -7,17 +7,24 @@ require_once __DIR__ . '/lib/bootstrap.php';
 $conn = db_connect();
 
 $productId = isset($_GET['id']) ? (int)$_GET['id'] : 0;
+
+if ($productId <= 0) {
+    include __DIR__ . '/404.php';
+    exit;
+}
+
+$checkStmt = $conn->prepare("SELECT productID FROM products WHERE productID = ?");
+$checkStmt->bind_param("i", $productId);
+$checkStmt->execute();
+$checkResult = $checkStmt->get_result();
+if ($checkResult->num_rows === 0) {
+    include __DIR__ . '/404.php';
+    exit;
+}
 ?>
 
 <?php include 'header.php'; ?>
 
-<?php if ($productId <= 0): ?>
-    <section class="product-section">
-        <h2>Produkt nicht gefunden</h2>
-        <p>Bitte eine gueltige Produkt-ID mitgeben.</p>
-    </section>
-
-<?php else: ?>
     <?php
     $stmt = $conn->prepare("
     SELECT 
@@ -491,5 +498,4 @@ $productId = isset($_GET['id']) ? (int)$_GET['id'] : 0;
         </div>
     </div>
 
-<?php endif; ?>
 <?php include 'footer.php'; ?>
\ No newline at end of file