Display comments section only for certain categories in WordPress

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You may wonder whether it’s possible, yes it’s certainly possible.All you have to do is add the below custom code in functions.php of your theme file or in my-custom-functions plugin

Here is code

add_action( 'the_post', 'Comments_ClosedCategories' );     	
function Comments_ClosedCategories()    
{        
     global $post;       
     $my_post_cat = wp_get_post_categories($post->ID);  
     //Array of Category ID's where you want to disable comments                  
     $disabled_cat = array( "8", "9","10","11","12","20","21","22"); 
     // this is he array of disabled categories..        
     $my_result = array_intersect($my_post_cat,$disabled_cat);       
     if (empty ( $my_result ) )        
     {            return;        
       
     }        
    else        
    {              
        add_filter( 'comments_open', 'st_close_comments_on_category', 10, 2 );             
        add_action('wp_enqueue_scripts', 'st_deregister_reply_js');       
    }   
}       
function st_deregister_reply_js()        
{        
    wp_deregister_script( 'comment-reply' );    
}                                                      

function st_close_comments_on_category ($open, $post_id)         
{              
    $open = false;                       
}

The above code will leave the comment closed on the categories included in the array and for other categories comment section would be still opened where they can post comments


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