WordPress重复标题处理：新增文章时自动追加Post ID代码优化需求

Hey there! Your existing code only handles empty titles, so let's extend it to check for duplicate titles and append the post ID when a match is found. Here's the updated solution that works exactly as you need:

Updated Code #

add_filter('title_save_pre', 'auto_append_id_on_duplicate_title');
function auto_append_id_on_duplicate_title($title) {
    global $post;

    // Only target 'post' type, skip if title is empty
    if (empty($title) || get_post_type($post) !== 'post') {
        return $title;
    }

    $current_post_id = isset($post->ID) ? $post->ID : 0;

    // Query to check for duplicate published posts with the same title (exclude current post)
    $duplicate_query = new WP_Query([
        'post_type'              => 'post',
        'post_status'            => 'publish',
        'title'                  => $title,
        'post__not_in'           => [$current_post_id],
        'posts_per_page'         => 1,
        'no_found_rows'          => true, // Optimize query speed
        'update_post_meta_cache' => false,
        'update_post_term_cache' => false,
    ]);

    // Append post ID if duplicate exists
    if ($duplicate_query->have_posts()) {
        $post_id = get_the_ID() ?: $current_post_id;
        $title = $title . ' - ' . $post_id;
    }

    wp_reset_postdata(); // Clean up query data
    return $title;
}

Key Details Explained #

• Duplicate Detection: We use WP_Query to scan for published posts with an identical title, excluding the current post to avoid false positives when editing existing content.
• Performance Tweaks: Added query optimizations like no_found_rows to speed up the check—since we only need to know if at least one duplicate exists, we don't need full pagination data.
• Targeted Scope: The code only runs for standard 'post' types; adjust get_post_type($post) !== 'post' if you need this for custom post types too.
• Edge Case Handling: Accounts for both new and existing posts by checking if $post->ID is set, ensuring we always grab the correct post ID to append.

Example #

If you already have a post titled "the best sandwich", creating a new post with the same title (and assigned post ID 216) will automatically update the new post's title to "the best sandwich - 216".

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