Hide fields in woo based upon category

gistfile1.txt

## Based upon code from https://calebburks.com/conditionally-showhide-woocommerce-checkout-fields/

function fx_category_is_in_the_cart() {
	
	// Add the category slugs here that you want to have the fields removed for
	$categories = array( 'clothing', 'posters' );

	// Products currently in the cart
	$cart_ids = array();

	// Categories currently in the cart
	$cart_categories = array();

	// Find each product in the cart and add it to the $cart_ids array
	foreach( WC()->cart->get_cart() as $cart_item_key => $values ) {
		$cart_product = $values['data'];
		$cart_ids[]   = $cart_product->id;
	}

	// Connect the products in the cart w/ their categories
	foreach( $cart_ids as $id ) {
		$products_categories = get_the_terms( $id, 'product_cat' );

		// Loop through each product category and add it to our $cart_categories array
		foreach ( $products_categories as $products_category ) {
			$cart_categories[] = $products_category->slug;
		}
	}

	// If one of the special categories are in the cart, return true.
	if ( ! empty( array_intersect( $categories, $cart_categories ) ) ) {
		return true;
	} else {
		return false;
	}
}

function fx_remove_checkout_fields( $fields ) {
	if ( ! fx_category_is_in_the_cart() ) {
		
		// add or remove billing fields you do not want in this section
		// list of fields: http://docs.woothemes.com/document/tutorial-customising-checkout-fields-using-actions-and-filters/#section-2
		unset( $fields['billing']['billing_company'] );
		unset( $fields['billing']['billing_phone'] );
		unset( $fields['billing']['billing_address_1'] );
		unset( $fields['billing']['billing_city'] );	
	}

	return $fields;
}
add_filter( 'woocommerce_checkout_fields' , 'fx_remove_checkout_fields' );