Retrieve cart items from a different php page

Hello there!

I have a custom php page on my site. I’m trying to initiate woocommerce global, and access cart items from there (this is obviously NOT in functions.php). But I get a 500 error everytime it runs. Code:

global $woocommerce;
$items = $woocommerce->cart->get_cart();

foreach($items as $item => $values) {
$cartartid = $values[‘sg_artid’];
$cartproductid = $values[‘product_id’];
if($cartproductid == “422” && $cartartid == $row[‘zzid’]) {
$tilewall = 0;
}
}

Is this possible to do and if so, what am I missing??

Thanks so much!