Member Avatar for kunnu

Hello, I have a custom script.

I want to add cart function in my script but I can't find any tutorial.

Please help me, any step by step tutorial?

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Dani AI

Generated

As asked for details and to build on ’s point about using existing solutions, here is a compact, practical roadmap and a minimal PHP example to add a cart into a custom script. The approach below uses session storage for the UI cart and a DB-backed checkout so prices and stock are authoritative on the server.

Start by modeling your data (store money as integer cents). Example minimal schema:

CREATE TABLE products (
  id INT PRIMARY KEY AUTO_INCREMENT,
  sku VARCHAR(64) NOT NULL,
  name VARCHAR(255) NOT NULL,
  price_cents INT NOT NULL,
  stock INT NOT NULL DEFAULT 0
);

CREATE TABLE orders (
  id INT PRIMARY KEY AUTO_INCREMENT,
  user_id INT NULL,
  total_cents INT NOT NULL,
  status VARCHAR(20) NOT NULL DEFAULT 'pending',
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE order_items (
  id INT PRIMARY KEY AUTO_INCREMENT,
  order_id INT NOT NULL,
  product_id INT NOT NULL,
  qty INT NOT NULL,
  unit_price_cents INT NOT NULL,
  subtotal_cents INT NOT NULL
);

Minimal session-cart and checkout flow (PDO, prepared statements, server-side price lookup):

session_start();
if (!isset($_SESSION['cart'])) $_SESSION['cart'] = [];

// cart operations
function cart_add($id, $qty=1) {
  $id = (int)$id; $qty = max(1,(int)$qty);
  $_SESSION['cart'][$id] = ($_SESSION['cart'][$id] ?? 0) + $qty;
}

function cart_remove($id) { unset($_SESSION['cart'][(int)$id]); }

// fetch product data for items in cart
function cart_items(PDO $pdo) {
  $ids = array_keys($_SESSION['cart']);
  if (!$ids) return [];
  $ph = implode(',', array_fill(0, count($ids), '?'));
  $stmt = $pdo->prepare("SELECT id,name,price_cents,stock FROM products WHERE id IN ($ph)");
  $stmt->execute($ids);
  $rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
  $items = [];
  foreach ($rows as $r) {
    $qty = $_SESSION['cart'][$r['id']];
    $items[] = ['id'=>$r['id'],'name'=>$r['name'],'qty'=>$qty,'unit_price_cents'=>$r['price_cents'],'subtotal_cents'=>$r['price_cents']*$qty];
  }
  return $items;
}

Checkout must be transactional and server-authoritative: calculate totals server-side, insert order and items inside a DB transaction, decrement stock with a conditional update (check affected rows) to avoid overselling, then commit. Clear session cart only after success.

Security and practical tips: never trust client prices or quantities; always fetch price and stock on checkout; use prepared statements; store currency as integer cents; use DB transactions and conditional stock updates; protect forms with CSRF tokens and serve checkout over HTTPS; for logged-in users persist carts in a carts table and merge on login. If adopting a packaged cart later, write a thin adapter that maps your product IDs and order flow to the package schema.

Recommended Answers

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Member Avatar for silviuks

Details please ...

Member Avatar for EverWebby

Find a reputable shopping cart script, install it on a subfolder of your site, customize it, and your good. If you have a small amount of items, use paypal buttons.

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