Adding a product to cart with custom info and price

Question

I have installed woocommerce to handle product input & checkout process of a wordpress shop.

The shop page is custom built which allows the user to pick a produc

Answer 1

Step 1:- You need to create some custom hidden fields to send custom data that will show on single product page. for example :-

add_action('woocommerce_before_add_to_cart_button', 'custom_data_hidden_fields');
function custom_data_hidden_fields() {
    echo '

        price: 

        quantity: 

            
                1
                2
                3
                4
                5
            
        
    

';
}

Step 2:- Now after done that you need to write the main logic for Save all Products custom fields to your cart item data, follow the below codes.

// Logic to Save products custom fields values into the cart item data
add_action( 'woocommerce_add_cart_item_data', 'save_custom_data_hidden_fields', 10, 2 );
function save_custom_data_hidden_fields( $cart_item_data, $product_id ) {

    $data = array();

    if( isset( $_REQUEST['price_prod'] ) ) {
        $cart_item_data['custom_data']['price_pro'] = $_REQUEST['price_prod'];
        $data['price_pro'] = $_REQUEST['price_prod'];
    }

    if( isset( $_REQUEST['quantity_prod'] ) ) {
        $cart_item_data['custom_data']['quantity'] = $_REQUEST['quantity_prod'];
        $data['quantity'] = $_REQUEST['quantity_prod'];
    }

    // below statement make sure every add to cart action as unique line item
    $cart_item_data['custom_data']['unique_key'] = md5( microtime().rand() );
    WC()->session->set( 'price_calculation', $data );

    return $cart_item_data;
}

Step 3: you need to override the item price with your custom calculation. It will work with your every scenario of your single product sessions.

add_action( 'woocommerce_before_calculate_totals', 'add_custom_item_price', 10 );
function add_custom_item_price( $cart_object ) {

    foreach ( $cart_object->get_cart() as $item_values ) {

        ##  Get cart item data
        $item_id = $item_values['data']->id; // Product ID
        $original_price = $item_values['data']->price; // Product original price

        ## Get your custom fields values
        $price1 = $item_values['custom_data']['price1'];
        $quantity = $item_values['custom_data']['quantity'];

        // CALCULATION FOR EACH ITEM:
        ## Make HERE your own calculation 
        $new_price = $price1 ;

        ## Set the new item price in cart
        $item_values['data']->set_price($new_price);
    }
}

Everything will be done inside the functions.php

Reference Site