Prevent guest checkout from repeat purchase of a particular product if using WooCommerce on your child site.
Snippet Type
Execute on Child Sites
Snippet
//Hook into the after checkout validation action, add a callback function named 'validate_no_repeat_purchase' with a priority of 10 and pass two arguments.
add_action( 'woocommerce_after_checkout_validation', 'validate_no_repeat_purchase', 10, 2 );
//The callback function accepts the array of posted checkout data and an array of errors
function validate_no_repeat_purchase( $data, $errors ) {
//extract the posted 'billing_email' and use that as an argument for querying orders.
$args = array(
'customer' => $data['billing_email'],
);
//loop through the cart items to see if one is the product that doesn't allow repeat purchases.
foreach( WC()->cart->get_cart() as $cart_item ) {
$product_id_no_repeat_purchases = 666;//substitute your product id.
if ( $cart_item['product_id'] === $product_id_no_repeat_purchases ) {//note the identical operator.
//use the WooCommerce helper function to query for orders with this email address:
$orders = wc_get_orders( $args );
//if an order with this email exists, don't allow another one.
if ( $orders ) {
$errors->add( 'validation', '<strong>Repeat order not allowed.</strong>' );
}
}
}
}