codeigniter在值之后显示货币符号

I have a problem, the currency symbol shows up in front of the value numbers. How can I position it after the value of the product? I think the code is the following, where "sym" goes for the row sym in the currency DB:

echo $sess[0]->sym.$this->Currency->convert($product[0]->product_price, $product[0]->product_currency, $sess[0]->currency, $currency);

I'm new into PHP/MySQL