WooCommerce 3产品库存通知异常：缺货时通知不显示

Hey Juraj, let's break down why your out-of-stock notifications aren't appearing and fix it up. The core issues are incorrect stock management checks and messed-up logic priority in your conditional statements—here's how to resolve it:

Key Problems in Your Original Code #

1. Incorrect stock management check: Using if ( $product->stock ) isn't the right way to verify if a product has stock management enabled. WooCommerce provides a dedicated method for this, and direct property access can lead to compatibility issues.
2. Logical operator priority issues: Your && and || combinations lack parentheses, so the code evaluates conditions in an order you didn't intend. For example, $product->get_stock_quantity() > 0 && $regular >= 500 || $sale >= 500 gets parsed as ($product->stock >0 && $regular >=500) OR $sale >=500, which skips the out-of-stock cases entirely when a sale price meets the threshold.

Fixed Code #

add_action( 'woocommerce_after_shop_loop_item','show_stock_shop', 90 );
function show_stock_shop() {
    global $product;
    
    // Get current active price (handles regular and sale prices automatically)
    $current_price = (float) $product->get_price();
    $is_in_stock = $product->is_in_stock();

    // Only run logic if stock management is enabled for the product
    if ( $product->managing_stock() ) { 
        // Simplify free shipping qualification check
        $qualifies_for_free_shipping = $current_price >= 500;

        if ( $is_in_stock && $qualifies_for_free_shipping ) {
            echo '<div class="remaining text-center pt-2 pb-2">Skladom. <span class="doprava-zadarmo">Doprava zadarmo</span></div>';
        } elseif ( !$is_in_stock && $qualifies_for_free_shipping ) {
            echo '<div class="remaining text-center pt-2 pb-2"><s>(nie je skladom)</s>. <span class="doprava-zadarmo">Doprava zadarmo</span></div>';
        } elseif ( $is_in_stock && !$qualifies_for_free_shipping ) {
            echo '<div class="remaining text-center pt-2 pb-2">Skladom. <span class="doprava-zadarmo">Doprava zadarmo od 500 eur</span></div>';
        } elseif ( !$is_in_stock && !$qualifies_for_free_shipping ) {
            echo '<div class="remaining text-center pt-2 pb-2"><s>(nie je skladom)</s>. <span class="doprava-zadarmo">Doprava zadarmo od 500 eur</span></div>';
        } else {
            // Fallback for special stock statuses (e.g., backorders)
            echo '<div class="remaining text-center pt-2 pb-2">Do ' . /*$stock .*/ ' dní</div>';
        }
    }
}

What Changed? #

• $product->managing_stock() instead of $product->stock: This is WooCommerce's official, future-proof method to check if stock management is enabled for a product.
• Simplified price handling: Using $product->get_price() automatically grabs the correct active price (regular or sale) instead of checking two separate variables.
• Clearer condition variables: Extracting $is_in_stock and $qualifies_for_free_shipping makes the code easier to read and eliminates logical priority errors.
• Explicit out-of-stock checks: Using !$is_in_stock ensures we correctly target products with 0 stock.

Test this with in-stock, out-of-stock, sale, and regular-priced products to confirm all notification cases work as expected.

内容的提问来源于stack exchange，提问作者Juraj