Upload Custom Options By CSV - Magento 1 - Programmatically

customopimport.php

<?php
$mageFilename = 'app/Mage.php';
require_once $mageFilename;
Mage::setIsDeveloperMode(true);
ini_set('display_errors', 1);
umask(0);
Mage::app('admin');
Mage::register('isSecureArea', 1);
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);

set_time_limit(0);

function getOptions($product_id){
    return array(
        array(
            'title' => 'Option Value',
            'price' =>0,
            'price_type' => 'fixed',
            'sku' => $product_id.'-customsku',
            'sort_order' => '0'
        )
    );
}


$uploadfile = basename("allproducts.csv");

    $csv                = new Varien_File_Csv();
    $data               = $csv->getData('/home/rcare/public_html/'.$uploadfile); //path to csv


    $message = '';
    $count   = 1;
    $obj = Mage::getModel('catalog/product');
    foreach($data as $_data){

        if($obj->getIdBySku($_data[0])) {


            $product_id = $obj->getIdBySku($_data[0]);

            $option = array(
                'title' => 'Label',
                'type' => 'checkbox',
                'is_require' => 1,
                'sort_order' => 0,
                'values' => getOptions($product_id)
            );

            $product = $obj->load($product_id);
            $optionInstance = $product->getOptionInstance()->unsetOptions();

            $product->setHasOptions(1);
            $optionInstance->setProduct($product);

            $product->setProductOptions([$option]);

            $product->setCanSaveCustomOptions(true);

            $product->save();
            $message .= $product_id . ' Custom VAT Option Added<br />';
            unset($product);
            $count++;
        }
    }
    echo $message;