Question

我正在尝试建立评论和答复系统，但是我遇到了一些问题。我想用JSON打印评论和回复，像这样：

{"comment":"data1","reply":[{"comment_id":"15","comment":"reply1"}]}

我已经做到了，但是在没有此回复的评论中重复回答：

{"comment":"data1","reply":[{"comment_id":"15","comment":"reply1"}]}

{"comment":"data2","reply":[{"comment_id":"15","comment":"reply1"},{"comment_id":"14","comment":"reply2"}]}

{"comment":"Легко. data3 ","reply":[{"comment_id":"15","comment":"reply1"},{"comment_id":"14","comment":"reply2"},{"comment_id":"13","comment":"reply3"},{"comment_id":"13","comment":"reply4"}]}

例如，在第二条评论的答复中，它显示了第一条评论的答复，但不应显示。

<?
$sql = "select * from comments where post_id=:post_id order by id desc";
$data = $db->prepare($sql);
$data->execute(array(':post_id' => $post_id));
$comments = $data->fetchAll();
$count = $data->rowCount();

foreach ($comments as $com) {
    $sql = "select * from reply where post_id=? and comment_id=? order by id desc";
    $data = $db->prepare($sql);
    $data->execute([$com['post_id'], $com['id']]);
    $replies = $data->fetchAll();

    foreach ($replies as $reply) {
        $xxx[] = [
            'comment_id' => $reply['comment_id'],
            'comment' => $reply['comment'],
        ];
        $xyc = [
            'comment' => $com['comment'],
            'reply' => $xxx,
        ];
    }
    echo json_encode($xyc, JSON_UNESCAPED_UNICODE);
    echo "<br></br>";

}

Answer 1

每次处理新评论时，您都需要重置$xxx。否则，您只需继续添加它，这就是为什么以后的输出还包含先前注释的答复的原因。

foreach ($comments as $com) {
  $xxx = array();
  //... etc

此外，要使代码更高效，您只需运行

$xyc = [
   'comment' => $com['comment'],
    'reply' => $xxx,
];

一次，在内部foreach循环结束之后。现在，它对每个答复都运行一次，这是不必要的-您要等到所有答复都处理完毕后再创建最终对象。

所以：

foreach ($replies as $reply) {
    $xxx[] = [
        'comment_id' => $reply['comment_id'],
        'comment' => $reply['comment'],
    ];
}

$xyc = [
    'comment' => $com['comment'],
    'reply' => $xxx,
];

echo json_encode($xyc, JSON_UNESCAPED_UNICODE);
echo "<br></br>";

对于该部分代码更有意义。

评论和回复系统

1 个答案: