Changing the category list order in Wordpress

Question

I am working on editing a Wordpress plugin file.

The code below lists the categories in Alphabetical order. I want to list them by Category ID, in ascending order.

<?php foreach($categories as $category){ 
    $rand = rand(0,99);
    $catname = get_cat_name( $category );
    $find =     array("&", "/", " ","amp;","&#38;");
    $replace  = array("", "", "", "","");           
    $catname = str_replace($find,$replace,get_cat_name( $category ));
?>                  
    <li>
        <a href="#fragment-<?php echo $catname; ?>"><?php echo get_cat_name( $category ); ?></a>
    </li>
<?php } ?>

I tried working with the get_cat_ID function, but I'm not a programmer so I got stuck. Please help.

Answer 1

Rather than querying categories inside a theme file, a better way is to register a custom function in your wordpress theme.

Googling "wordpress category order by id" give me this link

https://wordpress.org/support/topic/how-to-order-my-categories-by-id-instead-of-name . The answer there is good.

add_filter('get_the_categories','get_the_category_sort_by_id');

function get_the_category_sort_by_id( $categories ) {
    usort($categories, '_usort_terms_by_ID');
    return $categories;
}

You can then call the function in your theme files which will return categories ordered by id. Something like that:

<?php
$categories = get_the_category_sort_by_id($categories);
foreach($categories as $category){ 
    ...
?>
    <li>
        <a href="#fragment-<?php echo $catname; ?>"><?php echo get_cat_name( $category ); ?></a>
    </li>
<?php } ?>