Customer had ever buy product

function has_bought() {
	// Get all customer orders
	$is_mask = true;
	if(is_user_logged_in()){ 
		$customer_orders = get_posts( array(
					'numberposts' => 1, // one order is enough
					'meta_key'    => '_customer_user',
					'meta_value'  => get_current_user_id(),
					'post_type'   => 'shop_order', // WC orders post type
					'post_status' => 'wc-completed', // Only orders with "completed" status
					'fields'      => 'ids', // Return Ids "completed"
				));
	
	// return "true" when customer has already at least one order (false if not)
	f(count($customer_orders) > 0){
			$is_mask = false;
		};
}