这将创建一个自定义元框，它包含的textarea字段的内容将保存为帖子的注释。请注意：

使用改编自Codex的代码示例构建
相关功能：add_meta_box 和wp_insert_comment.

我已删除comment_author_IP 和comment_agent 从插入注释参数。不确定后果。

罢工Bug: 重复的注释@Hameedullah Khan...

测试为mu-plugin 在主题的functions.php

add_action( \'add_meta_boxes\', \'add_custom_box_wpse_81739\' );
add_action( \'save_post\', \'save_postdata_wpse_81739\', 10, 2 );

/* Adds a box to the main column on the Post and Page edit screens */
function add_custom_box_wpse_81739() 
{
    add_meta_box( 
        \'sectionid_wpse_81739\',
        __( \'Publish a Comment\' ),
        \'inner_custom_box_wpse_81739\',
        \'post\' 
    );
}

/* Prints the box content */
function inner_custom_box_wpse_81739( $post ) 
{
    // Use nonce for verification
    wp_nonce_field( plugin_basename( __FILE__ ), \'noncename_wpse_81739\' );

    // The actual fields for data entry
    // Use get_post_meta to retrieve an existing value from the database and use the value for the form
    //$value = get_post_meta( $post->ID, $key = \'_my_meta_value_key\', $single = true );
    echo \'<label for="new_field_wpse_81739">\';
    _e( "Enter your comment:" );
    echo \'<br />\';
    echo \'<textarea id="new_field_wpse_81739" name="new_field_wpse_81739" cols="80" rows="5"></textarea></label>\';
}

/* When the post is saved, saves our custom data */
function save_postdata_wpse_81739( $post_id, $post_object ) 
{
    // verify if this is an auto save routine. 
    // If it is our form has not been submitted, so we dont want to do anything
    if ( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE )  
        return;

    // don\'t run the echo if the function is called for saving revision.
    if ( \'revision\' == $post_object->post_type )
        return;

    // verify this came from the our screen and with proper authorization,
    // because save_post can be triggered at other times
    if ( !wp_verify_nonce( $_POST[\'noncename_wpse_81739\'], plugin_basename( __FILE__ ) ) )
        return;

    // Check permissions
    if ( \'page\' == $_POST[\'post_type\'] ) 
    {
        if ( !current_user_can( \'edit_page\', $post_id ) )
            return;
    }
    else
    {
        if ( !current_user_can( \'edit_post\', $post_id ) )
            return;
    }

    // OK, we\'re authenticated: we need to find and save the data

    //sanitize user input
    $mydata = esc_textarea( $_POST[\'new_field_wpse_81739\'] );

    $time = current_time(\'mysql\');
    global $current_user;
    get_currentuserinfo();

    $data = array(
        \'comment_post_ID\' => $post_id,
        \'comment_author\' => $current_user->user_login,
        \'comment_author_email\' => $current_user->user_email,
        \'comment_author_url\' => \'http://\',
        \'comment_content\' => $mydata,
        \'comment_type\' => \'\',
        \'comment_parent\' => 0,
        \'user_id\' => $current_user->ID,
        \'comment_date\' => $time,
        \'comment_approved\' => 1,
    );

    wp_insert_comment( $data );
}