Question

I want to select a post only if $arr_tags match all array_elements with tags_is_tags. For example in this situation will be outputted 0 posts because one array element didn’t match with tags_id_tags

How can i do something like that ?

$arr_tags = array("16", "17", "36", "543"); // the dimension is not always the same

post_id_post        tags_id_tags    
    282                      16     
    282                      17     
    282                      36 
    282                      546 

I have this code but the query is not finished.

            $sql = $db -> prepare("
                SELECT post_id_post 
                FROM posts
                // ...
            ");

            $sql -> bind_param('s', $val);
            $sql -> execute();
            $sql -> bind_result($d_post);

Thanks for your time

Answer 1

  SELECT post_id_post
    FROM posts
   WHERE tags_id_tags IN ("16", "17", "36", "543")
GROUP BY post_id_post
  HAVING COUNT(*) = 4

You put all the required tags’ IDs in the IN clause and change the number in COUNT(*) = 4 expression to the number of tags passed