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How would I use a blog/site id to count posts from the id specified site much like wp_count_posts() does for the current site?

I'm trying to create a function for an AJAX accessed endpoint where a user can select a site from a select element to see how many posts there are on other sites.

I really want to stay away from querying the database directly.

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In order to use wp_count_posts() as you would on a single site, pass the blog id into the switch_to_blog() function before calling wp_count_posts().

Example:

function wpse_get_post_count( $blog_id ){
    switch_to_blog( $blog_id );
    $post_count = wp_count_posts();
    restore_current_blog();
    return $post_count;
}

Ensure restore_current_blog() is used after every switch_to_blog() or you will risk difficulties mentioned in the notes section of the documentation and this WordPress Stack Exchange answer.

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  • Don't you need to restore_current_blog() after you switch? So maybe store the value in a variable and then return it after you restore the current blog. – Nikolay Feb 18 '18 at 6:48
  • @Nikolay There doesn't seem to be a reason to restore the "current" blog in this case, but once/if I find one, I will update my answer. – ExcellentSP Feb 18 '18 at 6:55
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    It says here in the notes section that "restore_current_blog() should be called after every switch_to_blog()": codex.wordpress.org/Function_Reference/restore_current_blog – Nikolay Feb 18 '18 at 9:11
  • Thank you for that @Nikolay, I have edited my answer. – ExcellentSP Feb 18 '18 at 16:57
  • Cool, no problem :) – Nikolay Feb 18 '18 at 17:45

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