pocketmine\inventory\ShapedRecipe::getIngredientList PHP Method

    public function getIngredientList()
    {
        $ingredients = [];
        for ($x = 0; $x < 3; ++$x) {
            for ($y = 0; $y < 3; ++$y) {
                if (!empty($this->ingredients[$x][$y])) {
                    if ($this->ingredients[$x][$y]->getId() !== Item::AIR) {
                        $ingredients[] = clone $this->ingredients[$x][$y];
                    }
                }
            }
        }
        return $ingredients;
    }