WordPress-WooCommerce：为不同产品类别添加差异化价格后缀的代码修正求助

Hey there! Let's get those price suffixes working correctly for your telephone services and signage design products. I spotted a couple of issues in your original code that were preventing it from working as expected—let's break them down and fix things up.

What Was Wrong With the Original Code? #

1. Incorrect has_term Usage (First Code Snippet)
   The has_term() function expects the second parameter to be the taxonomy name, not a category slug. For WooCommerce product categories, the taxonomy is product_cat, but your code was passing telephone and signage here, which meant the category check never triggered.

2. Undefined Function (Second Code Snippet)
   has_product_categories() isn't a default WooCommerce or WordPress function—you'd need to define it separately, which adds unnecessary complexity. Sticking with the native has_term() is more reliable.

Corrected Code #

This snippet will properly check product categories, handle variable products, and add the right suffix:

add_filter( 'woocommerce_get_price_html', 'conditional_price_suffix', 20, 2 );
function conditional_price_suffix( $price, $product ) {
    // Get the correct product ID (handle variations by using parent product ID)
    $product_id = $product->is_type('variation') ? $product->get_parent_id() : $product->get_id();
    
    // Check if product belongs to the "telephone" category
    if( has_term( 'telephone', 'product_cat', $product_id ) ) {
        $price .= ' ' . __('per month', 'woocommerce');
    } 
    // Check if product belongs to the "signage" category
    elseif( has_term( 'signage', 'product_cat', $product_id ) ) {
        $price .= ' ' . __('per hour', 'woocommerce');
    }
    
    return $price;
}

Key Improvements #

• Proper Taxonomy Reference: Uses product_cat (WooCommerce's default product category taxonomy) in has_term().
• Variable Product Support: Checks the parent product's category for variations, since variations inherit categories from their parent.
• Translation Ready: Includes the woocommerce text domain so the suffixes can be translated if needed.
• Clean Conditionals: Uses elseif to avoid adding both suffixes if a product accidentally ends up in both categories.

How to Use This #

1. Verify Category Slugs: Make sure your product categories have the slugs telephone and signage (check this in WordPress Admin → Products → Categories, edit a category and look at the slug field).
2. Add the Code: Paste this snippet into your child theme's functions.php file, or use a code snippet plugin like Code Snippets (safer than editing theme files directly if you're not comfortable).
3. Clear Cache: Flush your WooCommerce cache and browser cache to see the changes take effect.

内容的提问来源于stack exchange，提问作者Dan Nolan