Certainly, here's a basic example of a PHP code for adding items to a shopping cart. Please note that this is a simplified example, and in a real-world scenario, you'd likely use a database to store cart items and handle user sessions for a more robust e-commerce solution.
```php
<?php
session_start();
// Check if the "Add to Cart" button is clicked
if (isset($_POST['add_to_cart'])) {
// Get the product ID and quantity from the form
$product_id = $_POST['product_id'];
$quantity = $_POST['quantity'];
// Initialize the cart if it doesn't exist in the session
if (!isset($_SESSION['cart'])) {
$_SESSION['cart'] = array();
}
// Check if the product is already in the cart
if (array_key_exists($product_id, $_SESSION['cart'])) {
// If it is, update the quantity
$_SESSION['cart'][$product_id] += $quantity;
} else {
// If it's not, add it to the cart
$_SESSION['cart'][$product_id] = $quantity;
}
// Redirect to the shopping cart page or wherever you need to go
header('Location: shopping_cart.php');
exit;
}
?>
<!DOCTYPE html>
<html>
<head>
<title>Add to Cart Example</title>
</head>
<body>
<form method="post">
<input type="hidden" name="product_id" value="1">
<label for="quantity">Quantity:</label>
<input type="number" name="quantity" value="1" min="1">
<input type="submit" name="add_to_cart" value="Add to Cart">
</form>
</body>
</html>
```
In this example:
1. When the user clicks the "Add to Cart" button, the `add_to_cart` form is submitted.
2. The PHP code at the top checks if the button was clicked and retrieves the product ID and quantity from the form.
3. It initializes or retrieves the shopping cart from the PHP session.
4. It checks if the product is already in the cart. If it is, it updates the quantity; otherwise, it adds the product to the cart.
5. Finally, it redirects the user to the shopping cart page (replace `"shopping_cart.php"` with the appropriate URL) after updating the cart.
This is a very basic example and does not include a proper product catalog or cart display, which you would typically implement in a real e-commerce application.
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