Magento : How to add custom options programmatically

Here guys i am here with another interesting post on magento for creating product custom options programmatically.

[php]
$option = array(
'title' => 'Your custom option title',
'type' => 'radio', // could be drop_down ,checkbox , multiple
'is_require' => 1,
'sort_order' => 0,
'values' => getOptions()
);

function getOptions(){
return array(
array(
'title' => 'Option Value 1',
'price' =>100,
'price_type' => 'fixed',
'sku' => 'any sku for 1',
'sort_order' => '1'
),
array(
'title' => 'Option Value 2',
'price' =>100,
'price_type' => 'fixed',
'sku' => 'any sku for 2',
'sort_order' => '1'
),
array(
'title' => 'Option Value 3',
'price' =>100,
'price_type' => 'fixed',
'sku' => 'any sku for 3',
'sort_order' => '1'
)
);
}

//Suppose we are creating a new product.
$product = Mage::getModel('catalog/product');
$product->setProductOptions(array($option));
$product->setCanSaveCustomOptions(true);

//Or if we are adding the options to a already created product.
$product = Mage::getModel('catalog/product')->load($id);
$product->setProductOptions(array($option));
$product->setCanSaveCustomOptions(true);

//Do not forget to save the product
$product->save();
[/php]

Hope it helps some one :-)