When making netizen comments, we usually display the title of the article in conjunction with the database and make a connection, and then connect the comments.
Here, because each article has different netizen comments, it is necessary to use The passing of parameters causes each article to display different comments.
//****** Read the database data and display the article title************
echo "" ;
?>
Then combine the database in Pj.php to read the data with the id value $id, which is the comment of the netizen of the article. $topic is used to output the title of the article.
Of course this method of delivery does not have to be used, this is just my humble opinion.