Implode Taxonomy to hide parents?

Question

The following code will display the child taxonomy term of the parent only.

$terms = get_the_terms($wp_query->post->ID, 'propertytype');
 $props = array();
 foreach ($terms as $term) {
 if ($term->parent)
 $props[] = $term->name;
 }
 echo implode(', ', $props);

For example: London (Parent), West London (Child) - the above will only echo West London (Child).

However, if there are multiple child levels e.g London (Parent), West London (Child), Chelsea (Grand Child)

This does not work! I only want to display the last term.

How would i modify the above to only display the last term even if there is more than one sub level?

Thanks

Paul

FINAL CODE USED

   $terms = get_the_terms($wp_query->post->ID, 'propertytype');
      //die(print_r($terms));
      $props = array();
      foreach ($terms as $term) { 
      $hasChildrenTest = get_term_children($term->ID, 'propertytype');
          if ($term->parent) {
              if (empty($hasChildrenTest) && !is_wp_error($hasChildrenTest)) {
              $props[] = $term->name;
              }
          }
      }
      echo $props[0];

Answer 1

You can check if the resulting term has any children before adding it to the array:

$terms = get_the_terms($wp_query->post->ID, 'propertytype');
 $props = array();
 foreach ($terms as $term) {
    $hasChildrenTest = get_term_children($term->ID, 'propertyType');
 if ($term->parent) { 
    if (empty($hasChildrenTest) && !is_wp_error($hasChildrenTest)) {
         $props[] = $term->name;
    }
 }
 echo implode(', ', $props);

ps: the if($term->parent) test might become unnecessary after this. Check if you really need it.

edit: my mistake -> it should be empty $hasChildrenTest instead of !empty $hasChildrenTest so if the term has children it doesn't get added.