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I have a select box, which allows you to navigate between parent pages and their children, they are given a specific order, in order to display them in a certain way on the website.

I believe that the line of code that interest you is perhaps this one

$children = get_pages("title_li=&child_of=" . $parent . "&echo=0");

The full code is below. You can see that the order of the pages on the site is different than the order of the pages in the select menu, that is because wordpress sorts per order, my pages are sorted alphabetically. How to sort them by order, so that what you see on the website matches the select box?

<?php

// determine parent of current page

if ($post->post_parent)
 
 $ancestors = get_post_ancestors($post->ID);
 $parent = $ancestors[count($ancestors) - 1];
 
 else
 
 $parent = $post->ID;
 

$children = get_pages("title_li=&child_of=" . $parent . "&echo=0");
?>
<div id="info-select-wrap" class="single-france-select">
 <select id="info-select"class="fr-select" >
 <?php

if (get_the_ID() == $parent->ID): ?>
 <option value="<?php
 echo get_the_permalink($parent->ID); ?>" selected>  <?php
 echo get_the_title($parent->ID); ?></option>
 <?php
else: ?>
 <option value="<?php
 echo get_the_permalink($parent); ?>">  <?php
 echo get_the_title($parent); ?></option>

 <?php
endif;

foreach($children as $child):
 if (has_children($child))
 
 if (get_the_ID() == $child->ID)
 ?>
 <option value="<?php
 echo get_the_permalink($child->ID); ?>" selected>  <?php
 echo get_the_title($child->ID); ?></option>
 <?php
 
 else
 ?>
 <option value="<?php
 echo get_the_permalink($child->ID); ?>"> <?php
 echo get_the_title($child->ID); ?></option>



 <?php
 
 
 else
 
 if (get_the_ID() == $child->ID)
 ?>
 <option value="<?php
 echo get_the_permalink($child->ID); ?>" selected>  <?php
 echo get_the_title($child->ID); ?></option>
 <?php
 
 else
 ?>
 <option value="<?php
 echo get_the_permalink($child->ID); ?>"> <?php
 echo get_the_title($child->ID); ?></option>



 <?php
 
 

endforeach; ?>
 </select>
 </div>

I tried

$children = get_pages("title_li=&child_of=" . $parent . "&echo=0&orderby='menu_order'&order='ASC'");

Didn't solve it.

Issue solved by adding sort_column=menu_order

$children = get_pages("title_li=&child_of=" . $parent . "&echo=0&sort_column=menu_order");

Just a quick note, &echo=0 is useless, you can remove it.