PHP: Create an Infinitus comment module

The comment module of my graduation project was originally completed using the Duoshuo plug-in, but now I hope to be able to manage the comment content myself, so I started writing the comment module myself. The specific preparation is to adopt a similar structure to the next comment, that is, the first-level comments are displayed directly below the article, while the second- and third-level comments are displayed below the first-level comments, as shown in the following figure:

Comment structure

I think this can be said to be an application of Infinitus classification. To be precise, it is the application of descendant trees. After classifying descendant trees, loop Output the content and form a comment (Friends who don’t understand Infinitus classification can read my article Principles and Implementation of Infinitus Classification).

Of course, there are other key points to truly complete the function of Infinitus replying to comments. Let’s talk about how I completed Infinitus comments.

Database Design

First of all, it is the design of the data table. If it is a forum system, the comment data can be divided into two tables. One table stores the comment information, including the user id of the post or the user id of the reply, and the post id## of the reply. #, Reply time, etc.; another table stores the content of the comment, including the topic of the post and the content of the reply.

What I have completed is the comment module of the article. It is not divided into two tables. I directly put the content and information of the comment together, as follows:

Column nameColumn typeColumnDescriptioncomm_idINTUNSIGNED PRIMARY Primary Keyuser_idINTUNSIGNED NOT useridparent_idINTUNSIGNED NOT NULL DEFAULT 0Parent of commentartcile_idINTUNSIGNED NOT NULL DEFAULT 0 Commented article idcomm_contTEXTCommented contentcomm_INTUNSIGNED NOT NULL DEFAULT 0

SQL statement:

CREATE TABLE comment (
    comm_id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
    user_id INT UNSIGNED NOT NULL DEFAULT 0 ,
    parent_id INT UNSIGNED NOT NULL DEFAULT 0 ,
    article_id INT UNSIGNED NOT NULL DEFAULT 0 ,
    comm_cont TEXT,
    comm_time INT UNSIGNED NOT NULL DEFAULT 0 
) ENGINE=MYISAM CHARSET=UTF8 ;

This structure is the basis for completing Infinitus reply. It can also be clearly seen that the retrieved data can be well classified by Infinitus.

Structure analysis of comments

It is very easy to complete a comment module. Put the comments into the database, then retrieve them and place them in html. The comment module can also be completed. However, this structure is very messy and disorderly. If you want to complete a comment module like a comment, you have to use a special method.

Then, we need to take a closer look at the structure of comments.

Comment structure

Combined with the above data table structure, we can infer that the data taken out from the data table and classified by Infinitus, Its structure should be like this:

array (
    array(一级评论,
        child=>array(
            二级评论，
            三级评论
            ）
        ），
    array (
        一级评论 ，
        child=>array(
            )
    ……

Why do you say that? You can clearly see that the second- and third-level comments are wrapped in the first-level comments, and the second- and third-level comments are parallel relationships; therefore, the second- and third-level comments are descendant nodes of the first-level comments, and Second-level and third-level comments are parallel nodes, and there is no parent-child relationship.

Therefore, it can be concluded that the classified data has and has only one descendant node. Whether a multi-level comment is a reply to a first-level comment or not, as long as it is within the scope of a first-level comment, then its parent node It must be a first-level review.

So, how is the @XXXX in the second-level and third-level replies implemented? Actually, I was troubled here for a long time. I expected to use a self-join to the table to complete, but this does not work, destroying the structure described above. Finally, I got the answer from the requested json data, please see the commented json data:

##JSON data

It’s a bit blurry after uploading. Students can use the plug-in on Firefox or Google Chrome to observe the JSON data.

Focus on the

compiled_content field, and you can infer that it stores @XXXX directly into the database. In this way, the problem is solved. At the same time, observing the json data can also verify that the structure I mentioned above is correct.

Specific implementation

After analyzing the structure, let’s talk about how to complete Infinitus reply. The first step is to form a first-level comment. This is simple, just store the comment directly

First-level comment

And second-level comment Using js, when you click on a comment, get the user name of the first-level comment and save it. When posting a reply, be sure to combine it with the content of the comment and send it to the background:

Second level comments

// replyUser 即 被回复的用户名 @xxxx
var content = $('#reply').val.split(replyUser)[1];
var userlink = '<a href="#" class="xxx" target="_blank" >' + replyUser + '</a>';
var comm_cont = encodeURIComponent(userlink+content);

Then the performance in the database is as follows:

Data table content

After It is a key point to use the descendant tree for classification. The classification

function is as follows:

/**
 * @param $data array  数据
 * @param $parent  string 父级元素的名称 如 parent_id
 * @param $son     string 子级元素的名称 如 comm_id
 * @param $pid     int    父级元素的id 实际上传递元素的主键
 * @return array 
 */
function getSubTree($data , $parent , $son , $pid = 0) {
    $tmp = array();
    foreach ($data as $key => $value) {
        if($value[$parent] == $pid) {
            $value['child'] =  getSubTree($data , $parent , $son , $value[$son]);
            $tmp[] = $value;            
        }
    }
    return $tmp;
}

After such classification, the data structure changes, roughly as follows:

Classified data

With this structure, you can easily complete comments, as follows

<?php foreach($tree as $key=>$val) ?>
<p class="comm_list" >
    <h2><?php echo $val[&#39;user_name&#39;];?></h2>
    <p><?php echo $val[&#39;comm_cont&#39;] ?></p>
    <!-- 其他信息 -->
    <p class="comm_reply">
        <?php if(!empty($val[&#39;child&#39;])) { ?>
        <?php foreach($val[&#39;child&#39;] as $k=>$v) ?>
        <p class="reply_list" >
            <h2><?php echo $v[&#39;user_name&#39;];?></h2>
            <p><?php echo $v[&#39;comm_cont&#39;] ?></p>
            <!-- 其他信息 -->
        </p>
        <?php }}?>
    </p>
</p>
<?php } ?>

At the same time, the formed reply style is as follows:

snipaste20170105_204906.png

The Infinitus reply with similar comment structure is completed.

PS

This is just a form of comment. If there is a staircase-like structure, this implementation is simpler, as shown below:

Stairway comment structure

This structure is easy to complete, as long as the parent_id in the storage database is completely equal to the comm_id you replied to, after the following process Infinitus classification can be completed.

/**
 * 子孙树
 */
function getSubTree($data , $parent , $son , $pid = 0, $lev = 0) {
    $tmp = array();
    foreach ($data as $key => $value) {
        if($value[$parent] == $pid) {
            $value['lev'] = $lev;
            $tmp[] = $value;
            $tmp = array_merge($tmp , getSonTree($data , $parent , $son , $value[$son] , $lev+1));
        }
    }
    return $tmp;
}

This kind of infinite descendant tree classification is different from the descendant tree classification given earlier. After classification, the subclasses will not be wrapped in children, but will form a hierarchy, with the highest level being 0, and going down in sequence.

For example: the comm_id=1, parent_id=0 of the first-level comment, then the comm_id=2, parent_id=1 of the second-level comment; the comm_id=3, parent_id=2 of the third-level comment;

The classification finally forms the following structure

array(
array('comm_id'=>1,parent_id=>0,art_id=>1,'lev'=>0) ,
array('comm_id'=>2,parent_id=>1,art_id=>1,'lev'=>1),
array('comm_id'=>3,parent_id=>2,art_id=>1,'lev'=>2),
array('comm_id'=>4,parent_id=>3,art_id=>1,'lev'=>3),
array('comm_id'=>5,parent_id=>2,art_id=>1,'lev'=>2)
);

然后直接循环输出，并将lev作为属性打印在html中，最后利用js读取lev，并根据不同的等级分配不同的margin-left即可，它会随着margin的不同而排列在不同的位置，如下：

// html中
<?php foreach($tree as $key=>$val) {?>
<p class="comm_list" lev="<?php echo $val[&#39;lev&#39;]?>">
……
</p>
<?php } ?>

// js中
$('p.comm_list').css('margin-left' , 20 * lev);

		Attribute
		KEY AUTO_INCREMENT
		NULL DEFAULT 0
time			Comment Post time

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