/PHP/Adjacent post sort order by post title

Adjacent post sort order by post title

<?php
    $all_posts = new WP_Query(array(
        'orderby' => 'menu_order',
        'order' => 'ASC',
        'posts_per_page' => -1
    ));

    foreach($all_posts->posts as $key => $value) {
        if($value->ID == $post->ID){
            $nextID = $all_posts->posts[$key + 1]->ID;
            $prevID = $all_posts->posts[$key - 1]->ID;
            break;
        }
    }
?>
<?php if($prevID): ?>
    <span class="prev">
        <a href="<?= get_the_permalink($prevID) ?>" rel="prev"><?= get_the_title($prevID) ?></a>
    </span>
<?php endif; ?>
<?php if($nextID): ?>
    <span class="next">
        <a href="<?= get_the_permalink($nextID) ?>" rel="next"><?= get_the_title($nextID) ?></a>
    </span>
<?php endif; ?>

Source: wordpress.stackexchange.com

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