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How to add multiple variable products to the cart via the add-to-cart query string

I want to add two variable product into my cart when i clicking a link on my site. i added below code in my function.php this code is only working with the simple product its not working with the variable product.

function woocommerce_maybe_add_multiple_products_to_cart( $url = false ) {
// Make sure WC is installed, and add-to-cart qauery arg exists, and contains at least one comma.
if ( ! class_exists( 'WC_Form_Handler' ) || empty( $_REQUEST['add-to-cart'] ) || false === strpos( $_REQUEST['add-to-cart'], ',' ) ) {
return;
}

// Remove WooCommerce's hook, as it's useless (doesn't handle multiple products).
remove_action( 'wp_loaded', array( 'WC_Form_Handler', 'add_to_cart_action' ), 20 );

$product_ids = explode( ',', $_REQUEST['add-to-cart'] );
$count = count( $product_ids );
$number = 0;

foreach ( $product_ids as $id_and_quantity ) {
// Check for quantities defined in curie notation (<product_id>:<product_quantity>)
// https://dsgnwrks.pro/snippets/woocommerce-allow-adding-multiple-products-to-the-cart-via-the-add-to-cart-query-string/#comment-12236
$id_and_quantity = explode( ':', $id_and_quantity );
$product_id = $id_and_quantity[0];

$_REQUEST['quantity'] = ! empty( $id_and_quantity[1] ) ? absint( $id_and_quantity[1] ) : 1;

if ( ++$number === $count ) {
// Ok, final item, let's send it back to woocommerce's add_to_cart_action method for handling.
$_REQUEST['add-to-cart'] = $product_id;

return WC_Form_Handler::add_to_cart_action( $url );
}

$product_id = apply_filters( 'woocommerce_add_to_cart_product_id', absint( $product_id ) );
$was_added_to_cart = false;
$adding_to_cart = wc_get_product( $product_id );

if ( ! $adding_to_cart ) {
continue;
}

$add_to_cart_handler = apply_filters( 'woocommerce_add_to_cart_handler', $adding_to_cart->get_type(), $adding_to_cart );

// Variable product handling
if ( 'variable' === $add_to_cart_handler ) {
woo_hack_invoke_private_method( 'WC_Form_Handler', 'add_to_cart_handler_variable', $product_id );

// Grouped Products
} elseif ( 'grouped' === $add_to_cart_handler ) {
woo_hack_invoke_private_method( 'WC_Form_Handler', 'add_to_cart_handler_grouped', $product_id );

// Custom Handler
} elseif ( has_action( 'woocommerce_add_to_cart_handler_' . $add_to_cart_handler ) ){
do_action( 'woocommerce_add_to_cart_handler_' . $add_to_cart_handler, $url );

// Simple Products
} else {
woo_hack_invoke_private_method( 'WC_Form_Handler', 'add_to_cart_handler_simple', $product_id );
}
}
}

// Fire before the WC_Form_Handler::add_to_cart_action callback.
add_action( 'wp_loaded', 'woocommerce_maybe_add_multiple_products_to_cart', 15 );


/**
* Invoke class private method
*
* @since 0.1.0
*
* @param string $class_name
* @param string $methodName
*
* @return mixed
*/
function woo_hack_invoke_private_method( $class_name, $methodName ) {
if ( version_compare( phpversion(), '5.3', '<' ) ) {
throw new Exception( 'PHP version does not support ReflectionClass::setAccessible()', __LINE__ );
}

$args = func_get_args();
unset( $args[0], $args[1] );
$reflection = new ReflectionClass( $class_name );
$method = $reflection->getMethod( $methodName );
$method->setAccessible( true );

$args = array_merge( array( $class_name ), $args );
return call_user_func_array( array( $method, 'invoke' ), $args );
}


Also i want to run this code only one time. If the two product already added in cart then not added the product again into the cart.

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