Wp Taxonomy dropdown List

<?php
//
// Category Checklists
//

/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.1
 */
if(!class_exists('Walker_Category_Dropdownlist')){
class Walker_Category_Dropdownlist extends Walker {
    var $tree_type = 'category';
    var $db_fields = array ('parent' => 'parent', 'id' => 'term_id'); //TODO: decouple this

    function start_lvl(&$output, $depth, $args) {
        $indent = str_repeat("\t", $depth);
        $output .= "$indent<optgroup class='children'>\n";
                //$output .= "$indent\n";
    }

    function end_lvl(&$output, $depth, $args) {
        $indent = str_repeat("\t", $depth);
        $output .= "$indent</optgroup>\n";
                //$output .= "$indent\n";
    }

    function start_el(&$output, $category, $depth, $args) {
        extract($args);
        if ( empty($taxonomy) )
            $taxonomy = 'category';

        if ( $taxonomy == 'category' )
            $name = 'post_category';
        else
                        $name = $taxonomy;
            //$name = 'tax_input['.$taxonomy.']';

        $class = in_array( $category->term_id, $popular_cats ) ? ' class="popular-category"' : '';
        //$output .= "\n<li id='{$taxonomy}-{$category->term_id}'$class>" . '<label class="selectit"><input value="' . $category->term_id . '" type="checkbox" name="'.$name.'[]" id="in-'.$taxonomy.'-' . $category->term_id . '"' . checked( in_array( $category->term_id, $selected_cats ), true, false ) . disabled( empty( $args['disabled'] ), false, false ) . ' /> ' . esc_html( apply_filters('the_category', $category->name )) . '</label>';
                $output .= "\n<option id='{$taxonomy}-{$category->term_id}'$class " . ' value="' . $category->term_id . '"  ' . selected( in_array( $category->term_id, $selected_cats ), true, false ) . disabled( empty( $args['disabled'] ), false, false ) . ' /> ' . esc_html( apply_filters('the_category', $category->name )) . '';
                //$output .= '<label class="fullsize customcheckboxl" for="'.esc_html( apply_filters('the_category', $category->name )).$category->term_id.'"><input type="checkbox" id="'.esc_html( apply_filters('the_category', $category->name )).$category->term_id.'" class="customcheckbox" name="'.$name.'[]" '.checked( in_array( $category->term_id, $selected_cats ), true, false ).' value="'.$category->term_id.'" /> '.esc_html( apply_filters('the_category', $category->name )).'</label>';
                //'<label class="fullsize customcheckboxl" for="'.$language_list->cat_name.$language_list->cat_ID.'"><input type="checkbox" id="'.$language_list->cat_name.$language_list->cat_ID.'" class="customcheckbox" name="language[]" '.$check.' value="'.$language_list->cat_ID.'" /> '.$language_list->cat_name.'</label>';
    }

    function end_el(&$output, $category, $depth, $args) {
        $output .= "</option>\n";
                //$output .= "\n";
    }
}
}
/**
 * {@internal Missing Short Description}}
 *
 * @since 2.5.1
 *
 * @param unknown_type $post_id
 * @param unknown_type $descendants_and_self
 * @param unknown_type $selected_cats
 * @param unknown_type $popular_cats
 */
if(!function_exists('wp_category_dropdownlist')){
function wp_category_dropdownlist( $post_id = 0, $descendants_and_self = 0, $selected_cats = false, $popular_cats = false, $walker = null, $checked_ontop = true ) {
        wp_terms_dropdownlist($post_id,
            array(
                    'taxonomy' => 'category',
                    'descendants_and_self' => $descendants_and_self,
                    'selected_cats' => $selected_cats,
                    'popular_cats' => $popular_cats,
                    'walker' => $walker,
                    'checked_ontop' => $checked_ontop
        ));
    }
}
/**
 * Taxonomy independent version of wp_category_checklist
 *
 * @since 3.0.0
 *
 * @param int $post_id
 * @param array $args
 */
if(!function_exists('wp_terms_dropdownlist')){
function wp_terms_dropdownlist($post_id = 0, $args = array()) {
    $defaults = array(
        'descendants_and_self' => 0,
        'selected_cats' => false,
        'popular_cats' => false,
        'walker' => null,
        'taxonomy' => 'category',
        'checked_ontop' => false
    );
    extract( wp_parse_args($args, $defaults), EXTR_SKIP );

    if ( empty($walker) || !is_a($walker, 'Walker') )
        $walker = new Walker_Category_Dropdownlist;

    $descendants_and_self = (int) $descendants_and_self;

    $args = array('taxonomy' => $taxonomy);

    $tax = get_taxonomy($taxonomy);
    $args['disabled'] = !current_user_can($tax->cap->assign_terms);

    if ( is_array( $selected_cats ) )
        $args['selected_cats'] = $selected_cats;
    elseif ( $post_id )
        $args['selected_cats'] = wp_get_object_terms($post_id, $taxonomy, array_merge($args, array('fields' => 'ids')));
    else
        $args['selected_cats'] = array();

    if ( is_array( $popular_cats ) )
        $args['popular_cats'] = $popular_cats;
    else
        $args['popular_cats'] = get_terms( $taxonomy, array( 'fields' => 'ids', 'orderby' => 'count', 'order' => 'DESC', 'number' => 10, 'hierarchical' => false ) );

    if ( $descendants_and_self ) {
        $categories = (array) get_terms($taxonomy, array( 'child_of' => $descendants_and_self, 'hierarchical' => 0, 'hide_empty' => 0 ) );
        $self = get_term( $descendants_and_self, $taxonomy );
        array_unshift( $categories, $self );
    } else {
        $categories = (array) get_terms($taxonomy, array('get' => 'all'));
    }

    if ( $checked_ontop ) {
        // Post process $categories rather than adding an exclude to the get_terms() query to keep the query the same across all posts (for any query cache)
        $checked_categories = array();
        $keys = array_keys( $categories );

        foreach( $keys as $k ) {
            if ( in_array( $categories[$k]->term_id, $args['selected_cats'] ) ) {
                $checked_categories[] = $categories[$k];
                unset( $categories[$k] );
            }
        }

        // Put checked cats on top
        echo call_user_func_array(array(&$walker, 'walk'), array($checked_categories, 0, $args));
    }
    // Then the rest of them
    echo call_user_func_array(array(&$walker, 'walk'), array($categories, 0, $args));
}
}


/**
 * Display or retrieve the HTML dropdown list of categories.
 *
 * The list of arguments is below:
 *     'show_option_all' (string) - Text to display for showing all categories.
 *     'show_option_none' (string) - Text to display for showing no categories.
 *     'orderby' (string) default is 'ID' - What column to use for ordering the
 * categories.
 *     'order' (string) default is 'ASC' - What direction to order categories.
 *     'show_last_update' (bool|int) default is 0 - See {@link get_categories()}
 *     'show_count' (bool|int) default is 0 - Whether to show how many posts are
 * in the category.
 *     'hide_empty' (bool|int) default is 1 - Whether to hide categories that
 * don't have any posts attached to them.
 *     'child_of' (int) default is 0 - See {@link get_categories()}.
 *     'exclude' (string) - See {@link get_categories()}.
 *     'echo' (bool|int) default is 1 - Whether to display or retrieve content.
 *     'depth' (int) - The max depth.
 *     'tab_index' (int) - Tab index for select element.
 *     'name' (string) - The name attribute value for select element.
 *     'id' (string) - The ID attribute value for select element. Defaults to name if omitted.
 *     'class' (string) - The class attribute value for select element.
 *     'selected' (int) - Which category ID is selected.
 *     'taxonomy' (string) - The name of the taxonomy to retrieve. Defaults to category.
 *
 * The 'hierarchical' argument, which is disabled by default, will override the
 * depth argument, unless it is true. When the argument is false, it will
 * display all of the categories. When it is enabled it will use the value in
 * the 'depth' argument.
 *
 * @since 2.1.0
 *
 * @param string|array $args Optional. Override default arguments.
 * @return string HTML content only if 'echo' argument is 0.
 */
function wp_terms_dropdownlist_retrieve( $args = '' ) {
    $defaults = array(
        'show_option_all' => '', 'show_option_none' => '',
        'orderby' => 'id', 'order' => 'ASC',
        'show_last_update' => 0, 'show_count' => 0,
        'hide_empty' => 0, 'child_of' => 0,
        'exclude' => '', 'echo' => 1,
        'selected' => 0, 'hierarchical' => 0,
        'name' => 'cat', 'id' => '',
        'class' => 'postform', 'depth' => 0,
        'tab_index' => 0, 'taxonomy' => 'category',
        'hide_if_empty' => false
    );

    $defaults['selected'] = ( is_category() ) ? get_query_var( 'cat' ) : 0;

    // Back compat.
    if ( isset( $args['type'] ) && 'link' == $args['type'] ) {
        _deprecated_argument( __FUNCTION__, '3.0', '' );
        $args['taxonomy'] = 'link_category';
    }

    $r = wp_parse_args( $args, $defaults );

    if ( !isset( $r['pad_counts'] ) && $r['show_count'] && $r['hierarchical'] ) {
        $r['pad_counts'] = true;
    }

    $r['include_last_update_time'] = $r['show_last_update'];
    extract( $r );

    $tab_index_attribute = '';
    if ( (int) $tab_index > 0 )
        $tab_index_attribute = " tabindex=\"$tab_index\"";

    $categories = get_terms( $taxonomy, $r );
    $name = esc_attr( $name );
    $class = esc_attr( $class );
    $id = $id ? esc_attr( $id ) : $name;

    if ( ! $r['hide_if_empty'] || ! empty($categories) )
        //$output = "<select name='$name' id='$id' class='$class' $tab_index_attribute>\n";
                $output = '<select name="'.$name.'[]" id="'.$id.'" class="'.$class.'" '.$tab_index_attribute.'>';
    else
        $output = '';


        /*
    if ( empty($categories) && ! $r['hide_if_empty'] && !empty($show_option_none) ) {
        $show_option_none = apply_filters( 'list_cats', $show_option_none );
        $output .= "\t<option value='-1' selected='selected'>$show_option_none</option>\n";
    }
        */
        //var_dump($r['selected']);
    $cbselect = $r['selected'];
        //var_dump($cbselect[0]);
        $r['selected'] = $cbselect[0];

        if ( ! empty( $categories ) ) {
                /*
        if ( $show_option_all ) {
            $show_option_all = apply_filters( 'list_cats', $show_option_all );
            $selected = ( '0' === strval($r['selected']) ) ? " selected='selected'" : '';
            $output .= "\t<option value='0'$selected>$show_option_all</option>\n";
        }
        if ( $show_option_none ) {

            $show_option_none = apply_filters( 'list_cats', $show_option_none );
            $selected = ( '-1' === strval($r['selected']) ) ? " selected='selected'" : '';
            $output .= "\t<option value='-1'$selected>$show_option_none</option>\n";

                        //$output .= "\n<li id='{$taxonomy}-{$category->term_id}'$class>" . '<label class="selectit"><input value="' . $category->term_id . '" type="checkbox" name="'.$name.'[]" id="in-'.$taxonomy.'-' . $category->term_id . '"' . checked( in_array( $category->term_id, $selected_cats ), true, false ) . disabled( empty( $args['disabled'] ), false, false ) . ' /> ' . esc_html( apply_filters('the_category', $category->name )) . '</label>';
        }
                */

        if ( $hierarchical )
            $depth = $r['depth'];  // Walk the full depth.
        else
            $depth = -1; // Flat.

        $output .= walk_category_dropdown_tree( $categories, $depth, $r );
    }
    if ( ! $r['hide_if_empty'] || ! empty($categories) )
        $output .= "</select>\n";


    $output = apply_filters( 'wp_dropdown_cats', $output );

    if ( $echo )
        echo $output;

    return $output;
}

?>