how to find the sum in laravel controller code example
Example 1: laravel eloquent sum column
Product::where('id',$id)->sum('quantity');
Example 2: laravel sum column values
Auth::user()->products->sum('price');
// And on your App/User.php you need someting like this:
public function products(){
return Products::where('id_buyer', Auth::user()->id)->get();
}