WooCommerce: Add product to cart with price override?

Question

$replace_order = new WC_Cart();
$replace_order->empty_cart( true );
$replace_order->add_to_cart( \"256\", \"1\");

The above code add product

Answer 1

For the Wordpress and Woocommerce latest version,Please use like this

add_action( 'woocommerce_before_calculate_totals', 'add_custom_price' );

function add_custom_price( $cart_object ) {
    foreach ( $cart_object->cart_contents as $key => $value ) {
        $custom_price = 5;
        $value['data']->set_price($custom_price); 
    }
}