WooCommerce多语言产品仅显示关联语言旗帜的技术问询

Got it, let's fix this issue where untranslated language flags lead to the homepage on product detail pages. The key is to filter Polylang's language list to only include languages that have a translation for the current product. Here are two straightforward methods:

Method 1: Modify Template Code Directly #

Replace your existing pll_the_languages() call with this code in your product template file (like single-product.php or your custom theme's product template part):

<?php
// Check if we're on a single product page
if ( is_product() ) {
    global $product;
    $current_product_id = $product->get_id();
    $available_languages = [];

    // Get all enabled languages from Polylang
    $all_enabled_langs = pll_languages_list();

    // Loop through languages to check for product translations
    foreach ( $all_enabled_langs as $lang_code ) {
        $translated_product_id = pll_get_post( $current_product_id, $lang_code );
        // Add language to list if a translation exists
        if ( $translated_product_id ) {
            $available_languages[] = $lang_code;
        }
    }

    // Output only flags for languages with product translations
    if ( ! empty( $available_languages ) ) {
        pll_the_languages( [
            'show_flags' => 1,
            'show_names' => 0,
            'include'    => $available_languages,
        ] );
    }
} else {
    // For non-product pages, keep showing all enabled languages
    pll_the_languages( [ 'show_flags' => 1, 'show_names' => 0 ] );
}
?>

How this works: #

• It first checks if we're on a single product page to avoid breaking other pages.
• Uses pll_get_post() to verify if the current product has a translation for each enabled language.
• Passes the filtered list of languages to pll_the_languages() via the include parameter, so only valid translation flags are displayed.

Method 2: Use a Polylang Hook (Cleaner for Global Changes) #

If you prefer not to modify template files, add this code to your theme's functions.php file. It uses a Polylang hook to automatically filter the language list on product pages:

add_filter( 'pll_the_languages_args', 'filter_product_translation_languages', 10, 1 );
function filter_product_translation_languages( $args ) {
    // Skip filtering if not on a single product page
    if ( ! is_product() ) {
        return $args;
    }

    global $product;
    $current_product_id = $product->get_id();
    $available_languages = [];

    $all_enabled_langs = pll_languages_list();
    foreach ( $all_enabled_langs as $lang_code ) {
        if ( pll_get_post( $current_product_id, $lang_code ) ) {
            $available_languages[] = $lang_code;
        }
    }

    // Update args to include only valid languages
    if ( ! empty( $available_languages ) ) {
        $args['include'] = $available_languages;
    } else {
        // If no translations exist, only show the current language
        $args['include'] = [ pll_current_language() ];
    }

    return $args;
}

How this works: #

• The pll_the_languages_args hook modifies the parameters passed to pll_the_languages() globally.
• It automatically filters out languages without a product translation on single product pages, while leaving other pages unaffected.
• Your original template code (<?php pll_the_languages(array('show_flags'=>1,'show_names'=>0)); ?>) stays exactly the same.

Important Notes: #

• Ensure the WooCommerce Polylang Integration plugin is active, as it handles the link between WooCommerce products and Polylang translations.
• Test this with products that have partial translations to confirm only valid flags appear.

内容的提问来源于stack exchange，提问作者user11427967