A non well formed numeric value encountered

[Mrrkha]

Dear,
Could you help me ?
I got error "A non well formed numeric value encountered".

[calebeso]

Make sure to cast your variables before perform any math operations, this error means that you have a format problem.

function presentPrice($price)
{
    $price = is_string($price) ? (float)$price : $price; 
    return 'R$' . number_format($price, 2, ",", ".");
}