Fatal error: Uncaught TypeError: Unsupported operand types: string - int in /home/blabo/www/app/models/Produit.php:67 Stack trace: #0 /home/blabo/www/app/controllers/ProductController.php(26): App\models\Produit->getProductsByCategory() #1 /home/blabo/www/core/App.php(31): ProductController->index() #2 /home/blabo/www/public/index.php(16): App->__construct() #3 {main} thrown in /home/blabo/www/app/models/Produit.php on line 67