Método de Lista de Compras

public function getCombinedIngredients()
{
    $ingredients = array();
    foreach ($this->recipes as $recipe) {
        foreach ($recipe->getIngredients() as $i) {
            $item = $i['item'];
            if (strpos($item, ",")) {
                $item = strstr($item, ",", true);
            }
            if (array_key_exists($item . "s", $ingredients)) {
                $item .= "s";
            } else if (array_key_exists(substr($item,0,-1),$ingredients)) {
                $item = substr($ingredient,0,-1);
            }
            $ingredients[$item][] = array($i["amount"],$i["measure"]);
        }
    }
    return $ingredients;
}