Products in Magento - SKUs from a category

Question

Would you have any way to get product SKUs from a category? For example, I have a category with id = 13 and I need to get the SKUs of these products dynamically, so I can do checks that I created in my code.

And I would need to save these SKUs of these products in an array so I can do a check in my code, as I currently "pick up" these SKUs manually by placing them in an array.

Code created in a controller:

public function isCartaoAddAction(){
            $array_de_skus_de_cartoes = array(45,60,80,90,102,103,104,105); //SKUs products
            $isCartaoAdicionado = 0;
            $cart = Mage::getModel('checkout/cart')->getQuote();
            foreach ($cart->getAllItems() as $item) {    
                foreach ($array_de_skus_de_cartoes as $sku) {
                    if($sku == $item->getProduct()->getSku()) {
                        $isCartaoAdicionado = 1;
                        $cartao_id = Mage::getModel("catalog/product")->getIdBySku($sku);
                    }
                }
            }
            if($isCartaoAdicionado == 1) {
                echo json_encode(array('adicionado' => '1','id_produto' => $cartao_id));
            } else {
                echo json_encode(array('adicionado' => '','id_produto' => ''));
            }
        }

Answer 1

Try Below code to get all SKUs

Update: Instead of Using multiple foreach loop, you can use PHP in_array function.

<?php
public function isCartaoAddAction(){
    $categoryId = 13;
    $collection = Mage::getModel('catalog/category')
                ->load($categoryId)
                ->getProductCollection();
    foreach($collection as $product){
         $array_de_skus_de_cartoes[] = $product->getSku();
    }
    //$array_de_skus_de_cartoes = array(45,60,80,90,102,103,104,105); //SKUs products
    $isCartaoAdicionado = 0;
    $cart = Mage::getModel('checkout/cart')->getQuote();
    foreach ($cart->getAllItems() as $item) {           
        if(in_array($item->getProduct()->getSku(), $array_de_skus_de_cartoes)) {
            $sku = $item->getProduct()->getSku();
            $isCartaoAdicionado = 1;
            $cartao_id = Mage::getModel("catalog/product")->getIdBySku($sku);
        }
    }
    if($isCartaoAdicionado == 1) {
        echo json_encode(array('adicionado' => '1','id_produto' => $cartao_id));
    } else {
        echo json_encode(array('adicionado' => '','id_produto' => ''));
    }
}
?>