wp_dropdown_categories multiple example for the BuddyForms Form Builder

wp_dropdown_categories_multiple.php

  <?php
  $taxonomies = buddyforms_taxonomies($form_slug);

  $taxonomy = false;
  if(isset($buddyforms_options['buddyforms'][$form_slug]['form_fields'][$field_id]['taxonomy']))
      $taxonomy = $buddyforms_options['buddyforms'][$form_slug]['form_fields'][$field_id]['taxonomy'];
  $form_fields['left']['taxonomy'] 		= new Element_Select('<b>' . __('Taxonomy', 'buddyforms') . '</b>', "buddyforms_options[buddyforms][".$form_slug."][form_fields][".$field_id."][taxonomy]", $taxonomies, array('value' => $taxonomy));

  $taxonomy_order = 'false';
  if(isset($buddyforms_options['buddyforms'][$form_slug]['form_fields'][$field_id]['taxonomy_order']))
      $taxonomy_order = $buddyforms_options['buddyforms'][$form_slug]['form_fields'][$field_id]['taxonomy_order'];
  $form_fields['left']['taxonomy_order'] 		= new Element_Select('<b>' .__('Taxonomy Order', 'buddyforms') . '</b>', "buddyforms_options[buddyforms][".$form_slug."][form_fields][".$field_id."][taxonomy_order]", array('ASC','DESC'), array('value' => $taxonomy_order));

  $taxonomy_default = 'false';
  if(isset($buddyforms_options['buddyforms'][$form_slug]['form_fields'][$field_id]['taxonomy_default']))
      $taxonomy_default = $buddyforms_options['buddyforms'][$form_slug]['form_fields'][$field_id]['taxonomy_default'];

  if($taxonomy) {
      $wp_dropdown_categories_args = array(
          'hide_empty'        => 0,
          'child_of'          => 0,
          'echo'              => FALSE,
          'selected'          => false,
          'hierarchical'      => 1,
          'name'              => "buddyforms_options[buddyforms][".$form_slug."][form_fields][".$field_id."][taxonomy_default][]",
          'class'             => 'postform chosen',
          'depth'             => 0,
          'tab_index'         => 0,
          'taxonomy'          => $taxonomy,
          'hide_if_empty'     => FALSE,
          'orderby'           => 'SLUG',
          'order'             => $taxonomy_order,
      );


      $dropdown = wp_dropdown_categories($wp_dropdown_categories_args);

      $dropdown = str_replace('id=', 'multiple="multiple" id=', $dropdown);

      if (is_array($taxonomy_default)) {
          foreach ($taxonomy_default as $key => $post_term) {
              $dropdown = str_replace(' value="' . $post_term . '"', ' value="' . $post_term . '" selected="selected"', $dropdown);
          }
      } else {
          $dropdown = str_replace(' value="' . $taxonomy_default . '"', ' value="' . $taxonomy_default . '" selected="selected"', $dropdown);
      }

      $dropdown = '<div class="bf_field_group">
              <div class="buddyforms_field_label"><b>Taxonomy Default</b></div>
              <div class="bf_inputs">' . $dropdown . ' </div>

          </div>';


      $form_fields['left']['taxonomy_default'] 		= new Element_HTML($dropdown);