How to change the 'stock management' availability text on single product page based on different conditions in WooCommerce

Question

I'm trying to change the stock management availability text on single product page based on different conditions in WooCommerce.

There are 5 situations, depending on whether 'Enable stock management at product level' is turned on or off.

1. Turned on, Quantity: 0
2. Turned on, Quantity: 2
3. Turned on, Quantity: 3+
4. Turned off, Out of stock
5. Turned off, In stock

---

I'm using

add_filter( 'woocommerce_get_availability', 'wcs_custom_get_availability', 1, 2);
function wcs_custom_get_availability( $availability, $_product ) {
   global $product;

    // Case 3
    if ( $_product->is_in_stock() ) {
        $availability['availability'] = __('3. Turned on, Quantity: 3+', 'woocommerce');
    }

    // Case 2
    if ( $_product->is_in_stock() && $product->get_stock_quantity() <= 2 ) {
        $availability['availability'] = sprintf( __('2. Turned on, Quantity: 2', 'woocommerce');
    }

   // Case 5
    if ( $_product->is_in_stock() && $product->get_stock_quantity() <= 0 ) {
        $availability['availability'] = sprintf( __('5. Turned off, In stock', 'woocommerce'));
    }
    
    // Case 4 and 1 - out of stock
    if ( ! $_product->is_in_stock() ) {
        $availability['availability'] = __('4. Turned off, Out of stock / 1. Turned on, Quantity: 0', 'woocommerce');
    }

    return $availability;
}

---

But how to make it work for variable products?

For simple product it works perfect but for variable products 2 (out of 5) situations shows wrong results:

1. Turned on, Quantity: 0 [Works ok]
2. Turned on, Quantity: 2 [Wrong - shows case no.5]
3. Turned on, Quantity: 3+ [Wrong - shows case no.5]
4. Turned off, Out of stock [Works ok]
5. Turned off, In stock [Works ok]

Answer 1

if $product->get_stock_quantity() <= 0 than $_product->is_in_stock() will always be false because the stock number is below 0 or equal to 0, so there is the error in your logic.

It is also not necessary to use and mix global $product and $_product. Because $_product already contains the product object.

• $product->managing_stock() might come in handy

So you could use instead:

// Change In Stock Text
function filter_woocommerce_get_availability( $availability, $product ) {       
    // Managing stock is activated
    if ( $product->managing_stock() ) {
        // Stock quantity
        $stock_quantity = $product->get_stock_quantity();
        
        // Compare
        if ( $stock_quantity <= 0 ) {
            $availability['availability'] = __('1. Turned on, Quantity: less then or equal to 0', 'woocommerce' );
        } elseif ( $stock_quantity > 0 && $stock_quantity <= 2 ) {
            $availability['availability'] = __('2. Turned on, Quantity: 1 or 2', 'woocommerce' );           
        } elseif ( $stock_quantity > 3 )  {
            $availability['availability'] = __('3. Turned on, Quantity: 3+', 'woocommerce' );
        }
    } else {
        // In stock
        if ( $product->is_in_stock() ) {
            $availability['availability'] = __('4. Turned off, In stock', 'woocommerce' );      
        } else {
            $availability['availability'] = __('5. Turned off, Out of stock', 'woocommerce' );              
        }
    }

    return $availability;
}
add_filter( 'woocommerce_get_availability', 'filter_woocommerce_get_availability', 10, 2 );