Hi @chanshaw
To use a template function e.g. the_field(…) in function.php, you have to add a second parameter; the $post_id which tells ACF from where to grab the values from.
Try this:
function load_highest_order_number()
{
$category7 = query_posts('meta_key=order_number&cat=7');
while ( have_posts() ) : the_post();
echo get_field('order_number', get_the_ID());
endwhile;
wp_reset_query();
return max($array);
}
Check out the following links for more information:
http://www.advancedcustomfields.com/resources/get_field/
http://www.advancedcustomfields.com/resources/the_field/
Hope this helps 🙂
