Including variables in a custom select statement in WordPress

My custom select statement:

$querystr = "
    SELECT $wpdb->posts.* 
    FROM $wpdb->posts, $wpdb->comments
    WHERE $wpdb->posts.ID = $wpdb->comments.comment_post_ID
    AND $wpdb->posts.post_status = 'publish'
    AND $wpdb->posts.post_type = 'post'
    GROUP BY $wpdb->posts.ID
    ORDER BY comment_count DESC

My aim is to limit the results returned to a particular set of post authors.

I have an array of WordPress post author user IDs in a variable $user_ids.

I thought about adding the following to my select statement, but I'm sure the following syntax isn't the right way to do it:

AND $wpdb->posts.post_author = $user_ids

Hoping someone can help show me the right way to do this?


if $user_ids are coma separated values then you can do this

  AND $wpdb->posts.post_author in ( $user_ids)

if $user_ids is an array then use this :

   AND $wpdb->posts.post_author in ( implode( ',', $user_ids ))

First you should make a string:

$user_ids_string = implode(',',$user_ids)

then your syntax will be:

AND $wpdb->posts.post_author in ($user_ids_string)

Note: If your ids are not integers you should also wrap them with quotes ''

Tags: PHP / Mysql / Wordpress

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