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I have a WordPress multisite with one main site and four sub-sites. All five sites have a custom post type with the name property, and each site has several posts of this type. In a PHP template on my main site, I would like to execute a WP_Query() that fetches all of these custom posts from one of the sub-sites (id = 4). How would I approach that?

My existing code is:

$blog_id = 4;
$posts = array();
switch_to_blog( $blog_id );
$query = new WP_Query(
  array(
    'post_type' => 'property',
  )
);
while ( $query->have_posts() ) {
  $query->next_post();
  $posts[] = $query->post;
}
restore_current_blog();
error_log(print_r($posts,true));

The output written to the error log is a zero-length array:

[29-Nov-2018 11:33:44 UTC] Array
(
)
  • I have confirmed that $blog_id = 4 does indeed contain several posts of type property.

Previous Stack Exchange Questions

I found these three related questions, but none have a marked answer:

I found these two questions with workarounds marked as the answer, and the scope of the first is dissimilar to mine. I'd like to know if a solution exists before pursuing a workaround:

  • 1
    What exactly is the problem with switch_to_blog() & restore_current_blog() as suggested in the linked questions? – kero Nov 29 '18 at 12:16
  • @kero Which question do you mean? – cag8f Nov 29 '18 at 16:13
  • This answer uses the method, but has alot of code. They reference this answer which suggest switch_to_blog( ID ); /* do your stuff */ restore_current_blog(); for this kind of work – kero Nov 29 '18 at 16:33
  • @kero Doesn't my code also follow the switch_to_blog( ID ); /* do your stuff */ restore_current_blog(); model? – cag8f Nov 30 '18 at 11:50

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