PHP development article comment system
I recently needed to complete a comment function at work, and I searched online for several display styles of the comment system. Finally, with reference to comment systems such as "Duosuo" and "Changyan", I implemented a simple comment system using PHP language. The implementation process of the two methods (recursive and non-recursive) is recorded, and the advantages and disadvantages of the two methods are analyzed, but how the front-end is implemented is not shown.
First design the database as follows:
create table `comments`( `id` bigint unsigned not null AUTO_INCREMENT, `arc_id` bigint unsigned not null COMMENT '文章id', `user_id` bigint unsigned not null COMMENT '用户id', `comment_id` bigint unsigned not null DEFAULT '0' COMMENT '回复某个评论的id', `content` varchar(255) not null DEFAULT '' COMMENT '评论或回复的内容', `add_time` timestamp not null DEFAULT CURRENT_TIMESTAMP COMMENT '添加时间', PRIMARY KEY (`id`), KEY `arc_id` (`arc_id`) )ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT '文章评论表';
Create test data as follows:
The specific implementation plan is as follows (in Implemented on the ThinkPHP framework):
1. Recursive method
Advantages: The implementation code is simple, and if the level of comments is fixed at five levels or less, it is recommended to use this method, so that the front-end can easily implement this data result .
Disadvantages: If the level of comments is not fixed, the front end will not be able to display the comment information, and if there are too many levels, it will consume a lot of memory. What’s more terrible is that every recursion has to query the database, and the performance will be reduced. Greatly reduced.
/**
* @param $arc_id 文章id
* @param int $comm_id 评论id
* @param array $result
* @return array
*/
function getCommlist($arc_id, $comm_id = 0, &$result = array()){ //获取评论列表
if(empty($arc_id)){
return array();
}
$_where = "arc_id = {$arc_id} AND comment_id = {$comm_id}";
$res = M('comments')->where($_where)->order('add_time DESC')->select();
if(empty($res)){
return array();
}
foreach ($res as $cm) {
$thisArr = &$result[];
$cm["_child"] = getCommlist($arc_id,$cm['id'],$thisArr);
$thisArr = $cm;
}
return $result;
}Part of the data is displayed as follows:
#2. Non-recursive method (stack method implementation)
Advantages: only query A primary database has better performance. N-level comments can be realized, and the front-end can also display them well.
Disadvantages: The code is slightly complicated. For fixed-level comments, the front-end display of comments is more complicated.
/**
* @param $arc_id 文章id
* @return array
*/
public function getCommlist($arc_id){
if(empty($arc_id)){
return array();
}
$res = M('comments')->where(array('arc_id'=>$arc_id))->order('add_time ASC')->select();
$dataList = $stack = array();
if($res){
foreach($res AS $k=>$v){ //先将评论的数据进行入库（即comment_id=0）
if($v['comment_id'] == 0){
$v['_level'] = 0; //设置层级数
$v['_root'] = $v['id']; //标识评论id
array_push($stack,$v); //入栈
unset($res[$k]);
}
}
while(!empty($stack)){
$node = array_pop($stack); //出栈
$dataList[] = $node;
foreach($res as $_k=>$_v){
if($_v['comment_id'] == $node['id']){
$_v['_level'] = $node['_level']+1; //设置层级数
$_v['_root'] = $node['_root']; //标识评论id
array_push($stack,$_v); //入栈
unset($res[$_k]);
}
}
}
}
return $dataList;
}The data display effect is as follows:
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