2、后台 ：用到了两次递归，首先用递归把数据库中的结果重组下，重组之后，然后用递归输出上面的那种前台代码即可
comment表结构和内容如下
然后直接读出这个表中的所有评论。可以得到如下数组
Array
(
[0] => Array
(
[id] => 1
[pid] =>
[content] => 评论1
)
[1] => Array
(
[id] => 2
[pid] =>
[content] => 评论2
)
[2] => Array
(
[id] => 3
[pid] =>
[content] => 评论3
)
[3] => Array
(
[id] => 4
[pid] => 1
[content] => 评论4回复评论1
)
[4] => Array
(
[id] => 5
[pid] => 1
[content] => 评论5回复评论1
)
[5] => Array
(
[id] => 6
[pid] => 2
[content] => 评论6回复评论2
)
[6] => Array
(
[id] => 7
[pid] => 4
[content] => 评论7回复评论4
)
[7] => Array
(
[id] => 8
[pid] => 7
[content] => 评论8回复评论7
)
[8] => Array
(
[id] => 9
[pid] => 8
[content] => 评论9回复评论8
)
[9] => Array
(
[id] => 10
[pid] => 8
[content] => 评论10回复评论8
)
)
然后我们就需要把这个数组重组成上面的那种留言板形式的
其中$array就是上面读取出来的数组，首先取出pid默认为空的，然后递归，在取出pid为当前评论id的数组
public static function tree($array,$child="child", $pid = null)
{
$temp = [];
foreach ($array as $v) {
if ($v['pid'] == $pid) {
$v[$child] = self::tree($array,$child,$v['id']);
$temp[] = $v;
}
}
return $temp;
}重组后，可以得到下面的这个数组，可以看到，这个数组的样式已经和前台评论样式很像了
Array
(
[0] => Array
(
[id] => 1
[pid] =>
[content] => 评论1
[child] => Array
(
[0] => Array
(
[id] => 4
[pid] => 1
[content] => 评论4回复评论1
[child] => Array
(
[0] => Array
(
[id] => 7
[pid] => 4
[content] => 评论7回复评论4
[child] => Array
(
[0] => Array
(
[id] => 8
[pid] => 7
[content] => 评论8回复评论7
[child] => Array
(
[0] => Array
(
[id] => 9
[pid] => 8
[content] => 评论9回复评论8
[child] => Array
(
)
)
[1] => Array
(
[id] => 10
[pid] => 8
[content] => 评论10回复评论8
[child] => Array
(
)
)
)
)
)
)
)
)
[1] => Array
(
[id] => 5
[pid] => 1
[content] => 评论5回复评论1
[child] => Array
(
)
)
)
)
[1] => Array
(
[id] => 2
[pid] =>
[content] => 评论2
[child] => Array
(
[0] => Array
(
[id] => 6
[pid] => 2
[content] => 评论6回复评论2
[child] => Array
(
)
)
)
)
[2] => Array
(
[id] => 3
[pid] =>
[content] => 评论3
[child] => Array
(
)
)
)
得到上面的数组后 ，再用递归输出即可
public static function traverseArray($array)
{
foreach ($array as $v) {
echo "";
echo $v['content'];
if ($v['child']) {
self::traverseArray($v['child']);
}
echo "";
}
}以上就是怎么在php网站中实现一个留言板功能，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。
文章名称：怎么在php网站中实现一个留言板功能-创新互联
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