如何在编码之前将名称/标记添加到JSON数据中

我对处理JSON还很陌生。

我当前的脚本输出以下JSON：-

{"comments":[[17.9775280899,"2011-09-28 14:38:41","admin","1","2","http:'/'/www.example.com'/members'/admin'/","http:'/'/www.example.com'/wp-content'/uploads'/avatars'/1'/8bb11e958a26913e2c13393014e854d5-bpthumb.jpg","admin"],
[0.749063670412,"2011-09-28 14:43:11","admin","1","3","http:'/'/www.example.com'/members'/admin'/","http:'/'/www.example.com'/wp-content'/uploads'/avatars'/1'/8bb11e958a26913e2c13393014e854d5-bpthumb.jpg","admin"],
[36.329588015,"2011-10-06 14:15:12","admin","1","10","http:'/'/www.example.com'/members'/admin'/","http:'/'/www.example.com'/wp-content'/uploads'/avatars'/1'/8bb11e958a26913e2c13393014e854d5-bpthumb.jpg","admin"]]}

然而，我想为每条数据添加一个名称/标签，例如"leftPercent"、"timestamp"、"username"等。

这是我的脚本的相关部分：

首先我从数据库中获取数据。。。

$sQuery = "
    select cp_comments.*,users.user_login, users.user_url, users.display_name, users.ID as avatar
     from ".$wpdb->prefix."cp_comments cp_comments
        left join ".$wpdb->prefix."users users on users.ID=cp_comments.uid
        where songid='$id'
        order by cp_comments.id asc
";
$rResult = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());

然后我对数据进行一些自定义格式设置。（稍后还会添加其他项目，目前只是评论。

$output = array(        
    "comments" => array()
);

while ( $aRow = mysql_fetch_array( $rResult ) )
{
    $row = array();
    for ( $i=0 ; $i<count($aColumns) ; $i++ )
    {           
        if ( $aColumns[$i] == "playtime" )
        {
            /* Special output formatting for 'playtime' column */
            $row[] = ($aRow[ $aColumns[$i] ]) / $duration * 100;
        }
        else if ( $aColumns[$i] == "avatar" )
        {
            /* Special output to render Avatar by user id */
            $row[] = commentplayer_get_user_avatar($aRow[ $aColumns[$i] ]);
        }
        else if ( $aColumns[$i] != ' ' )
        {
            /* General output */
            $row[] = $aRow[ $aColumns[$i] ];
        }
    }
    $output['comments'][] = $row;
}

最后我对JSON:进行了编码

echo json_encode($output);

我缺了什么部分？我相信这很简单。谢谢大家。