通过 WordPress 中的帖子 ID 获取上一个/下一个帖子链接

Question

I am currently using the WordPress previous_post_link and next_post_link , which work as expected. The issue is that I have imported tons of posts via CSV file, so now most posts have the same date/timestamp, and WP doesn't pick the right prev/next post as it is based on date by default I believe. I have searched other answers which show how to search the ID, but I can't seem to implement it into a link, it only returns a plain ID. For sure I'm getting it wrong as I do not have much PHP knowledge.

I am using this code:

<div class="prev"><?php previous_post_link( '%link', '%title', TRUE ); ?>&nbsp;</div>
<div class="next"><?php next_post_link( '%link', '%title', TRUE ); ?>&nbsp;</div>

I have found the code below but I don't know how to turn it into the code format above.

<?php
function get_previous_post_id( $post_id ) {
    global $post;
    $oldGlobal = $post;
    $post = get_post( $post_id );
    $previous_post = get_previous_post();
    $post = $oldGlobal;
    if ( '' == $previous_post ) 
        return 0;
    return $previous_post->ID; 
} 

echo get_previous_post_id( $current_id );

An answer that can provide a working code is much appreciated. Thanks

Answer 1

@CBroe pointed out a couple of filter hooks allowing a programmer to control the meaning of "next" and "previous".

(WordPress customization code is all about hooks . If you don't know much about them, you would be wise to find out more.)

The hooks he suggests, get_next_post_sort and get_previous_post_sort , give us php programmers a way to intervene in the database queries to look up next and previous posts.

This code does it. It tells the database to order by id, then post date. The usual $order clause has this value "ORDER BY p.post_date $order LIMIT 1" , and this filter adds p.ID after the date. Therefore posts with identical dates will be ordered by ID, which is what you say you need.

/** Filter to disambiguate identical-date post ordering.
 *
 * @param string  $order_by  Usually "ORDER BY p.post_date $order LIMIT 1"
 * @param WP_Post $post      The current post object.
 * @param string  $order     Either 'ASC' or 'DESC'
 *
 * @returns string The modified $order_by string.
 */
function redibis_next_prev_by_id ( $order_by, $post, $order ) {
    return "ORDER BY p.post_date $order, p.ID $order LIMIT 1";
}

add_filter ( 'get_next_post_sort', 'redibis_next_prev_by_id', 10, 3 );
add_filter ( 'get_prev_post_sort', 'redibis_next_prev_by_id', 10, 3 );