Polylang插件问题：多语言站点无翻译时默认语言文章不显示

Hey there! I’ve dealt with this exact scenario using Polylang on WordPress, so I know how annoying it is when content vanishes when switching to a non-default language. Let’s get this sorted so your visitors see default-language posts when no translation exists.

Option 1: Adjust Your Custom WP_Query (Direct Fix) #

Polylang automatically filters queries to only show posts in the current active language. To include both current-language translations AND default-language posts where no translation exists, modify your WP_Query arguments to target both languages, then ensure you don’t display duplicate posts:

// Get current and default language codes using Polylang's built-in functions
$current_lang = pll_current_language();
$default_lang = pll_default_language();

// Query posts from both languages, with distinct results to avoid duplicates
$latest_blog_posts = new WP_Query( array(
    'posts_per_page' => 15,
    'lang' => array( $current_lang, $default_lang ),
    'post_status' => 'publish',
    'posts_distinct' => true
) );

// Loop through posts, prioritizing translated versions when available
if ( $latest_blog_posts->have_posts() ) :
    while ( $latest_blog_posts->have_posts() ) : $latest_blog_posts->the_post();
        // Check if a published translation exists for the current language
        $translated_post_id = pll_get_post( get_the_ID(), $current_lang );
        
        // Swap to the translated post if it exists
        if ( $translated_post_id && get_post_status( $translated_post_id ) === 'publish' ) {
            setup_postdata( get_post( $translated_post_id ) );
        }
        
        // Output your post content here (example)
        echo '<article>';
        echo '<h2>' . get_the_title() . '</h2>';
        echo '<div class="post-excerpt">' . get_the_excerpt() . '</div>';
        echo '</article>';
        
        // Reset postdata to prevent conflicts with subsequent queries
        wp_reset_postdata();
    endwhile;
endif;

Option 2: Global Filter (Apply to All Site Queries) #

If you want this fallback behavior to work across your entire site (not just this one custom query), add these functions to your theme’s functions.php file. This adjusts all front-end main queries to fall back to default-language content when no translation exists:

// Modify main queries to include current and default languages
add_action( 'pre_get_posts', 'pll_fallback_to_default_language' );
function pll_fallback_to_default_language( $query ) {
    // Skip admin area and non-main queries to avoid breaking backend functionality
    if ( is_admin() || ! $query->is_main_query() ) {
        return;
    }
    
    $current_lang = pll_current_language();
    $default_lang = pll_default_language();
    
    // Target both languages in the query
    $query->set( 'lang', array( $current_lang, $default_lang ) );
    // Add distinct clause to remove duplicate posts (original + translation)
    add_filter( 'posts_distinct', 'pll_distinct_posts' );
}

// Helper function to add distinct SQL clause
function pll_distinct_posts( $distinct ) {
    global $wpdb;
    return "DISTINCT {$wpdb->posts}.ID";
}

Quick Notes: #

• Ensure Polylang is properly installed, activated, and your default language is set correctly in Polylang’s settings.
• The pll_get_post() function is a Polylang native tool that retrieves the translated post ID for a given language—perfect for swapping to the translated version when it exists.
• The posts_distinct parameter ensures you don’t end up showing both the original default-language post and its translation in the same list.

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