$product->product_type code example
Example: $product->product_type
//The product_type property is deprecated. Use get_type() to get internal type.
//So you need to change this:
$product->product_type;
//to this:
$product->get_type();//The product_type property is deprecated. Use get_type() to get internal type.
//So you need to change this:
$product->product_type;
//to this:
$product->get_type();