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I want to get the ID of adjacent posts.

For posts sorted chronologically you can use:

get_adjacent_post

Are there any standard methods for finding the adjacent post if the posts are sorted by custom field value. Unless its very simple my skills are not up to writing a new function for this purpose.

Thanks.

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    Do you want to get the ID or a next/previous post link? For latter i can recommend a plugin, especially if you are not up to the task of coding it yourself: wordpress.org/plugins/ambrosite-nextprevious-post-link-plus ambrosite.com/plugins/… The former, just getting the ID, maybe isn't part of the functionality the plugin offers you, but a look at the code gives you a hint what way to go.
    – Nicolai Grossherr
    May 29, 2013 at 19:31
  • @ngsonst Thanks. I'm using that plugin to get the links and that's a good thought of yours, I'll go through the code and see if I can find a solution.
    – dorich
    May 30, 2013 at 6:54
  • If you can't get it working come back and ping me by putting @s_ha_dum in a comment. I have code that will reorder alphabetically by title. It should be adaptable for use with a meta field.
    – s_ha_dum
    May 30, 2013 at 15:02

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Hmmmm, the solution to this problem was to read the details of the plugin. It has the capability of returning values other than a link to the next post - this includes the ID of the Next and Previous Post.

In case anyone else reads this in the future and wants to see how to get the ID all you have to do is something like:

<?php $link=next_post_link_plus( array('order_by' => 'custom', 'meta_key' => 'Sort Number','return'=>'id') );?>

Then you can recover any information that you need from the post.

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