How do I get taxonomy terms by ID in a specific order

How do I get taxonomy terms by ID in a specific order. Below is my code and I thought if I passed get_terms the arguments to with ID and post_in but I am not seeing the results I thought I should.

$args_terms = array(
                'post_in' => array(47, 48, 49, 46 , 50, 5),
                'orderby' => 'post_in',
                'parent' => '0'
            );

$custom_post_type="menu-food";
$taxonomy = 'menu-food-categories';
$taxonomy_terms = get_terms( $taxonomy, $args_terms);

get_terms does not support a post__in argument and I don’t see any other argument that will let you force an order. You can, however, accomplish this with one fof at least two filters:

function gto_forced_order($orderby) {
  $orderby = "FIELD(t.term_id,5,1,4)";
  return $orderby;
}
add_filter('get_terms_orderby','gto_forced_order');

$terms = get_terms('category');
var_dump($terms);

Or…

function gto_forced_order($pieces) {
  $pieces['orderby'] = "ORDER BY FIELD(t.term_id,5,1,4)";
  return $pieces;
}
add_filter('terms_clauses','gto_forced_order');

That 5,1,4 are the term IDs. The query will sort in whatever is given there.

Those filters will both work globally, changing every call to get_terms, but by using the other arguments the filters offer you can control where the filter runs.

function gto_forced_order($pieces,$taxonomies,$args) {
  if (in_array('category',$taxonomies)) {
    $pieces['orderby'] = "ORDER BY FIELD(t.term_id,5,1,4)";
  }
  return $pieces;
}
add_filter('terms_clauses','gto_forced_order',1,3);

If you add var_dump($pieces,$taxonomies,$args) to the top of that callback you can see what you have to work with (though it will make a mess– debugging only).

It is similar with get_terms_orderby but the parameters are a bit different.