(SOLVED)The variable($product.id_product) is not passed to function :(

[dazfx]

Function that is called in product-list.php.

{mycat id_product_my=$product.id_product}

In this form, write a line above, the variable($product.id_product) is not passed to function:(

{$product.id_product} return right result as id.

{mycat id_product_my=15} return right result as categories of product with id(15).

What's wrong?

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php funct:

function smarty_compiler_mycat($params, &$smarty)

{

$id_product_my = $params['id_product_my'];

$ret = "";

if ($row = Db::getInstance(_PS_USE_SQL_SLAVE_)->ExecuteS('
SELECT cl.`name` FROM `'._DB_PREFIX_.'category_lang` cl
LEFT JOIN `'._DB_PREFIX_.'category_product` cp ON cl.`id_category` = cp.`id_category`
WHERE cp.`id_product` = '.(int)$id_product_my)
)

foreach ($row as $val)
{
$ret .= $val['name']." ";
}

return $ret;

}

It need to use function except compiler in the name of function smarty_compiler_mycat($params, &$smarty)