您在“编辑帖子”列中看到的内容由manage_posts_columns 滤器

通过playlist_id 我想你在找post_id （因为你提到的播放列表只是自定义的帖子类型）。您可以在主题的functions.php 文件：

if ( !function_exists(\'add_playlist_id_to_column\') && function_exists(\'add_theme_support\') ) {
    // Add our own column
    function add_playlist_id_to_column($cols) {
        $cols[\'playlist_id\'] = __(\'PlayList ID\',\'text-domain\');
        return $cols;
    }
    // Get the post\'s ID
    function add_playlist_value($column_name, $post_id) {
        // If there is a post_id set, output it. Otherwise, print NONE.
        if ( $post_id ) {
            echo $post_id;
        } else {
            echo __(\'None\',\'text-domain\');
        }
    }
    // Hook to `manage_posts_columns` to run our function
    add_filter( \'manage_posts_columns\', \'add_playlist_id_to_column\' );
    add_action( \'manage_posts_custom_column\', \'add_playlist_value\', 10, 2 );
}

您应该查看插件API，特别是manage_$post_type_posts_custom_column 行动和manage_{$post_type}_posts_columns 滤器

您需要知道自定义的帖子类型在内部被称为什么。一旦你知道替换{$post_type} 在下面要添加名为“New column”的列，您将添加如下新列：

function wpse_add_column_to_playlists($columns) {
    $columns[\'new_column\'] = __(\'New Column Name\', \'text_domain\');
    return $columns;
}
add_filter( \'manage_{$post_type}_posts_columns\', \'wpse_add_column_to_playlists\' );

function wpse_populate_new_column( $column, $post_id ) {
    switch ( $column ) {

        case \'new_column\' :
            //This is the new column, do stuff to populate it...
            echo (string) $post_id;
            break;

    }
}
add_action( \'manage_{$post_type}_posts_custom_column\' , \'wpse_populate_new_column\', 10, 2 );