$product->get_available_variations();

   add_action('init', 'wpc_test');
   function wpc_test()
   {
//       $post = get_posts(array('post_parent'=>9759));
//       var_dump($post);
//       exit();
       
        $product = wc_get_product( 9759 );
        var_dump("POST ID: 9759");
        if(method_exists($product, 'get_available_variations'))
        {
            $variations = $product->get_available_variations();
            var_dump($variations);
            exit();
        }
   }

add_action('wp_ajax_create_custom_variations', 'cvp_ajax_create_custom_variations');
add_action('wp_ajax_nopriv_create_custom_variations', 'cvp_ajax_create_custom_variations');
function cvp_ajax_create_custom_variations($import_excel = '', $product_id = 0)
{ 
    if($import_excel != '' && $product_id != 0)
    {
        $_POST['json'] = $import_excel;
        $_POST['post_id'] = $product_id;
    }
    
    $products_data = json_decode($_POST['json'], true);
    //var_dump($_POST['json']);
    if( $_POST['post_id'] == '')
    {
        return false;
    }

    $product_data['available_attributes'] = array("package");
    $product_data['variations'] = array();
    foreach ($products_data as $data) 
    {
        $array = array("attributes"=>array("package" => $data[0]."mg x ".$data[1]." pills"), "price" => $data[3], 'mg'=>$data[0], 'pills'=>$data[1], 'per_pill'=>$data[2]);
        array_push($product_data['variations'], $array);
    }
    
    //$_POST['post_id'] - містить правильний ідентифікатор батьківського продукту
    //$data - також містить правильні дані, так як по них ми створюємо атрибути для продукта, і в результаті все правильнос створюється
    
    wp_set_object_terms((int)$_POST['post_id'], 'variable', 'product_type'); // Set it to a variable product type
    insert_product_attributes((int)$_POST['post_id'], $product_data['available_attributes'], $product_data['variations']); // Add attributes passing the new post id, attributes & variations
    insert_product_variations((int)$_POST['post_id'], $product_data['variations']); // Insert variations passing the new post id & variations   

    //wp_die();
}

function insert_product_attributes ($post_id, $available_attributes, $variations)  
{
    var_dump('$post_id: '.$post_id);
    foreach ($available_attributes as $attribute) // Go through each attribute
    {   
        $values = array(); // Set up an array to store the current attributes values.

        foreach ($variations as $variation) // Loop each variation in the file
        {
            $attribute_keys = array_keys($variation['attributes']); // Get the keys for the current variations attributes

            foreach ($attribute_keys as $key) // Loop through each key
            {
                if ($key === $attribute) // If this attributes key is the top level attribute add the value to the $values array
                {
                    $values[] = $variation['attributes'][$key];
                }
            }
        }

        $values = array_unique($values); // Filter out duplicate values
        wp_set_object_terms($post_id, $values, 'pa_' . $attribute);
    }

    $product_attributes_data = array(); // Setup array to hold our product attributes data

    $product_attributes_data['pa_package'] = array( // Set this attributes array to a key to using the prefix 'pa'

        'name'         => 'pa_package',
        'value'        => '',
        'is_visible'   => '1',
        'is_variation' => '1',
        'is_taxonomy'  => '1'

    );
//    var_dump($product_attributes_data);
    update_post_meta($post_id, '_product_attributes', $product_attributes_data); // Attach the above array to the new posts meta data key '_product_attributes'
}

//var_dump(get_post(10369));
//exit();

function insert_product_variations($post_id, $variations)  
{
    
    delete_variations_product($post_id);
    
    var_dump("POST PARENT: ".$post_id);
    
    foreach ($variations as $index => $variation)
    {
        $variation_post = array( // Setup the post data for the variation

            'post_title'  => 'Variation #'.$index.' of '.count($variations).' for product#'. $post_id,
            'post_name'   => 'product-'.$post_id.'-variation-'.$index,
            'post_status' => 'publish',
            'post_parent' => $post_id,
            'post_type'   => 'product_variation',
            'guid'        => home_url() . '/?product_variation=product-' . $post_id . '-variation-' . $index
        );

        $variation_post_id = wp_insert_post($variation_post); // Insert the variation
//        var_dump($variation['attributes']);
        update_post_meta($variation_post_id, 'cutom_variation_name', str_replace('-', ' ', $variation['attributes']['package']));
        update_post_meta($variation_post_id, 'cvp_mg', $variation['mg']);
        update_post_meta($variation_post_id, 'cvp_pills', $variation['pills']);
        update_post_meta($variation_post_id, 'cvp_price', $variation['price']);
        update_post_meta($variation_post_id, 'cvp_per_pill', $variation['per_pill']);
        update_post_meta($variation_post_id, 'cvp_variation', $variation['per_pill']);
        
        
        foreach ($variation['attributes'] as $attribute => $value) // Loop through the variations attributes
        {   
            $attribute_term = get_term_by('name', $value, 'pa_'.$attribute); // We need to insert the slug not the name into the variation post meta

            var_dump("+++++++++++ ".update_post_meta($variation_post_id, "attribute_pa_".$attribute, $attribute_term->slug));
            var_dump("------------".get_post_meta($variation_post_id, "attribute_pa_".$attribute, true));
        }

        update_post_meta($variation_post_id, '_price', $variation['price']);
        update_post_meta($variation_post_id, '_regular_price', $variation['price']);
    }
}

function delete_variations_product($post_id)
{
    $product = wc_get_product( $post_id );
    var_dump("POST ID: ".$post_id);
    if(method_exists($product, 'get_available_variations'))
    {
        
    var_dump("POST ID 2: ".$post_id);
        $args = array(
            'numberposts' => -1,
            'post_parent' => $post_id
        );
        
        $get_posts = get_posts( $args );
        $variations = $product->get_available_variations();
        f_dump($args);
        f_dump($get_posts);
        foreach ($get_posts as $key => $variation) 
        {
            
            var_dump("DELETE POST 1");
            if(!get_post_meta($variation->ID, 'cvp_variation', true) && get_post_meta($variation->ID, 'cvp_variation', true) != '')
            {
                continue;
            }
            var_dump("DELETE POST 2");
            wp_delete_post( $variation->ID );
        } 
    }
}