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HomeBackend DevelopmentPHP Tutorialphp实现网站留言板功能_php实例

我要实现的就是下图的这种样式,可参考下面这两个网站的留言板,他们的实现原理都是一样的

畅言留言板样式:

网易跟帖样式:

原理
需要在评论表添加两个主要字段 id 和 pid  ,其他字段随意添加,比如文章id、回复时间、回复内容、回复人什么的。
其中pid就是当前已经回复过的评论的id。
从上图可以看出,里面每一层的pid就是就是他上一层评论的id。仔细观察下上面的布局。是不是很像PHP中的多维数组?如果你能想到,那么就简单了。
实现方法
1.前台:这个比较简单 就是div嵌div。然后设置div的border和margin  padding就行了

<div class="comment"> 
 <div class="comment"> 
  <div class="comment"> 
 
  </div> 
 </div> 
</div> 
 
<div class="comment"> 
 
</div> 

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 "<div class='comment' style='width: 100%;margin: 10px;background: #EDEFF0;padding: 20px 10px;border: 1px solid #777;'>"; 
  echo $v['content']; 
  if ($v['child']) { 
   self::traverseArray($v['child']); 
  } 
  echo "</div>"; 
 
 } 
 
} 

然后即可看到

原理就是这样,就是重组下数组,然后遍历输出就行了。

以上就是php实现畅言留言板和网易跟帖样式的全部过程,大家也可以尝试进行创新,希望这篇文章对大家的学习有所帮助。

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