我在插件中使用它，但它可以在主题的函数文件中使用。

// Create field to track users\' comments numbers                                    
function display_educadme_user_comments_number($user_id) {
            if( is_user_logged_in() ) {
                    global $wpdb;
                    $user_comments_number = $wpdb->get_var(\'SELECT COUNT(comment_ID) FROM \' . $wpdb->comments. \' WHERE comment_author_email = "\' . get_comment_author_email() . \'"\');

                        ?>                          
                            <h3><?php _e(\'Participation in the website\'); ?></h3>
                            <table class="form-table">
                                <tr>
                                    <th>
                                    <label for="user_comments_number">
                                    <?php _e(\'Number of comments\'); ?>
                                    </label></th>
                                    <td>
                                    <input type="text" name="user_comments_number" value="<?php echo $user_comments_number ?>">
                                   </td>
                                </tr>
                                <?php

                } else {}
        }

// Update users\' comments numbers
function save_educadme_user_comments_number($user_id) {
            if( is_user_logged_in() ) {
                    if ( !is_super_admin() )
                    return FALSE;
                    update_usermeta( $user_id, \'user_comments_number\', $user_comments_number );                     
                } else {}
    }

add_action( \'show_user_profile\', \'display_educadme_user_comments_number\' );
add_action( \'edit_user_profile\', \'display_educadme_user_comments_number\' );
add_action( \'profile_update\', \'save_educadme_user_comments_number\' );
add_action( \'comment_post\', \'save_educadme_user_comments_number\' );