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php实现网站留言板功能,php实现留言板
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php实现网站留言板功能,php实现留言板

Jun 13, 2016 am 08:51 AM
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php实现网站留言板功能,php实现留言板

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

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<div class="comment">

 <div class="comment">

  <div class="comment">

  

  </div>

 </div>

</div>

  

<div class="comment">

  

</div>

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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

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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

  )

  

)

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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

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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;

}

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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

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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

    (

    )

  

  )

  

)

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得到上面的数组后 ,再用递归输出即可

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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>";

  

 }

  

}

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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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