Code-Snippets-Functions/Execute a function on a child site/WooCommerce/show-local-pickup-shipping-method-only-for-specific-products.txt

// Allow local pickup only for specific product Ids
add_action( 'woocommerce_package_rates', 'show_hide_local_pickup_shipping_methods', 10, 2 );
function show_hide_local_pickup_shipping_methods( $rates, $package ) {

    // HERE BELOW the product Ids in the array allowing local pickup
    $product_ids   = array(12, 34, 56);
    $product_found = false;

    // Loop through cart items
    foreach( $package['contents'] as $item ){
        if( count( array_intersect($product_ids, [$item['variation_id'], $item['product_id']]) ) > 0 ) {
            $product_found = true;
            break;
        }
    }

    // Loop through shipping methods
    foreach( $rates as $rate_key => $rate ) {
        if( 'local_pickup' === $rate->method_id && ! $product_found ) {
            unset($rates[$rate_key]);
        }
    }
    return $rates;
}