Check If WooCommerce Cart Contains Specific Product

Want to verify if a specific product is already in the WooCommerce cart? This can be done easily using the woocommerce_before_cart action hook, which executes right before the cart page is displayed. It's a handy place to inject logic like this.  

Code Example: Check Product ID in Cart

Here's a simple code block that lets you check whether a certain product ID is present in the user's cart:  

add_action('woocommerce_before_cart', 'check_product_id_in_cart');

function check_product_id_in_cart() {
    $product_id_to_check = 123; // Replace 123 with the ID of the product you want to check
    $product_in_cart = false;

    // Get the cart contents
    $cart_items = WC()->cart->get_cart();

    // Loop through the cart items
    foreach ($cart_items as $cart_item_key => $cart_item) {
        $product_id = $cart_item['product_id'];

        // Check if the product ID is in the cart
        if ($product_id === $product_id_to_check) {
            $product_in_cart = true;
            break;
        }
    }

    if ($product_in_cart) {
        // Product ID is in the cart, do something
        echo 'The product is in the cart.';
    } else {
        // Product ID is not in the cart, do something else
        echo 'The product is not in the cart.';
    }
}

How the Code Works

The snippet loops through the cart contents and compares each product's ID with the one you're targeting. Depending on whether it matches, a message is printed.

Best Place to Add This Code

Place this code inside your theme’s functions.php file or inside a small custom plugin to execute it properly on the cart page.

Things to Keep in Mind

• Test thoroughly in a staging environment before deploying to production.
• Don't clutter your theme with too many hook-based checks for performance reasons.
• Be sure to replace the 123 with the correct product ID you want to monitor.

Helpful Resources

• Official WooCommerce Docs
• WordPress Hook Reference
• WooCommerce Tutorial by WPBeginner