我如何使用php从woocommerce rest api获取特定类别的产品

I tried doing the following and applying filter etc. seems like i am doing something wrong.Don't know what.

$data=$client->products->get('',array('category'=>33));

ok i tried if myself for about an hour and so it worked with this.

$data=$client->products->get('',array( 'filter[category]' => 'mens-fashion' ));