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I am going to make a "favourite" posts box, but the article id's are stored in another DB so I only get an array of IDs (which are relevant to the WP DB).

I think it could be done with get_posts() or simply just with WP_Query, however as I am surfing through the codex I cant find solution to my problem - you can obviously select posts by multiple tags, authors,... but I cant find something similar for just IDs.

I wouldnt even mind if the posts werent ordered. Mainly I just want to get a bunch of posts in one (WP)Query providing only posts' ids.

Any Ideas? Thanks :)

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2 Answers 2

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You could use post__in as a parameter in your WP_Query, like:

$favourite_posts = new WP_Query(
    array( 
        'post__in' => array( 111, 222, 333 ),
        'orderby' => 'ID'
    ) 
);
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  • It solves the main problem. However - one more question - How to order by the position of ids in provided array? You know like 'post__in' => array(8,1,4,2) would return posts in order like 8,1,4,2 - or is that by default with using post__in?
    – jave.web
    Jan 29, 2014 at 5:29
  • 1
    The custom order like 8,1,4,2, cannot be done with WP_Query by using orderby parameter, you have to select the posts first, then order them in PHP, maybe with a custom order function, something like that.
    – 1fixdotio
    Jan 29, 2014 at 5:37
  • Another funny thing - if the post__in's array() is empty it returns all the posts
    – jave.web
    Jan 29, 2014 at 5:49
  • Yes, it did! I've encountered that before.
    – 1fixdotio
    Jan 29, 2014 at 5:54
  • 1
    So to prevent extra posts I ended up with: WP_Query(array( 'post__in' => $favourite_posts, 'cat' => 1, 'post_type' => 'post', 'post_status' => 'publish', 'posts_per_page' => 3 ))
    – jave.web
    Jan 29, 2014 at 6:08
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To Maintain the Order as by Given IDs

Since 3.5 we have option called orderby => post__in

Preserve post ID order given in the post__in array (available since Version 3.5). 

$ordered_posts = new WP_Query(
    array( 
        'post__in' => array( 21, 5, 33 ),
        'orderby' => 'post__in'
    ) 
);
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3
  • Do you realize this makes as many SQL queries as there are fetched posts? :-) get_posts/WP_Query should loot them at once ...
    – jave.web
    Oct 24, 2016 at 9:58
  • You are right it is n+1 queries scenario. Thanks for the heads up, in my case it was for given three posts I wanted to show. But latest WP have another ordering built-in so I am going to update my answer with that. Thanks again for your kind feedback!
    – Muhammad Asadullah
    Oct 24, 2016 at 12:41
  • 1
    This is not what I wanted, but I will give this a +1 because it is an interesting way of abstractly doing custom order-ing :-) BTW: Be aware of queries*n, especially in WP stack, forums and other WP material this is often overlooked and causes trouble when used within more complex / larger websites :)
    – jave.web
    Oct 26, 2016 at 9:13

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