WooCommerce: check if product is out of stock and doesn't allow backorders

Question

How do I check if a product is out of stock (stock quantity 0) and doesn't allow backorders? The following code doesn't work for some reason.

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>';
}

It shows "backorders allowed" for products that allow backorders, but nothing if backorders are not allowed. Why?

Answer 1

Whenever I get an if statement that's not doing as I think it should, the first thing I try is to reverse it, so give this a go...

if($product->get_stock_quantity()>0) {
    echo '<p>Available</p>';
} else {
    if($product->backorders_allowed()) { 
        echo '<p>Backorders allowed</p>';
    } else {
        echo '<p>Backorders not allowed</p>';
    }
}

- I'd also make sure you're enclosing the various if bits with the {...} brackets. I know PHP is supposed to allow a more relaxed requirement with single line ifs, but it might be the cause!

Answer 2

When I have problems with a certain code I always check that each variable is returning the correct value.

In this case I separated each section to see what could be failing, and also I changed the Hook, to see that nothing could be causing some conflict.

Sorry if the code got too long. I commented in each part to help to understand what each part does. Also I added images of each result.

Case 1 https://i.stack.imgur.com/rmu5m.jpg

Case 2 https://i.stack.imgur.com/Zxnrt.jpg

Case 3 https://i.stack.imgur.com/v8Tzc.jpg

add_action('woocommerce_single_product_summary','show_stock_single',5);
function show_stock_single() {
  global $product;
  $StockQ=$product->get_stock_quantity();

  if ($StockQ>=1)//Stock is Available
  {
    echo "<p>Available</p>";
  }
  elseif($StockQ<1)//Product is Out of Stock
  {
    echo "<p>Out of Stock</p>";
    if ($product->backorders_allowed())//Product is out of stock AND allow backorders
    {
        echo "<p>Backorder Allowed</p>";
    }
    else//Product is out of stock AND DO NOT allow backorders
    {
        echo "<p>Backorder NOT Allowed</p>";
    }
  }
}

NOTE: The theme I use is Storefront to avoid any plugin/template conflict