问WooCommerce:检查产品是否脱销并且不允许缺货

EN

add_action('woocommerce_before_add_to_cart_button','show_stock_single');
function show_stock_single() {
  global $product;
  if($product->get_stock_quantity()<1) {
    if($product->backorders_allowed()) echo '<p>Backorders allowed</p>';
    else echo '<p>Backorders not allowed</p>';
  }
  else echo '<p>Available</p>';
}