Why do I have invalid argument supply for foreach in Laravel for json response? [duplicate]

php jquery ajax laravel laravel-5

PHP Snippet 1:

//...
$product  = json_decode($request->product, true);
//...

PHP Snippet 2:

 public function dopayment(Request $request) {

            $input = $request->all();

            $product = json_decode($request->product);


            foreach ($product as $single) {
                # code...

                print_r($single->name);
            }

           print_r($product);
            exit;
        }

PHP Snippet 3:

if (is_array($product ) || is_object($product ))
{
    foreach($product as $arrayItems){
      // Perform x.
    }
}