Aşağıdaki kod WP_Widget_Categories sınıf almak ve bir özel kategoriler Widget varsayılan kategorilere dayalı widget için temel olarak kullanmak için bir girişimdir.

Ancak hiçbir çıkış alıyorum ve Widget "Mevcut Widget'lar" listesinde gösteren değil. Ben yanlış ne yapıyorum?

<?php
/*
Plugin Name: My Categories Widget
Version: 1.0
*/


class MY_Widget_Categories extends WP_Widget {

    function MY_Widget_Categories() {
        $widget_ops = array( 'classname' => 'widget_categories', 'description' => __( "A list or dropdown of categories" ) );
        $this->WP_Widget('categories', __('Categories'), $widget_ops);
    }

    function widget( $args, $instance ) {
        extract( $args );

        $title = apply_filters('widget_title', empty( $instance['title'] ) ? __( 'Categories' ) : $instance['title']);
        $c = $instance['count'] ? '1' : '0';
        $h = $instance['hierarchical'] ? '1' : '0';
        $d = $instance['dropdown'] ? '1' : '0';

        echo $before_widget;
        if ( $title )
            echo $before_title . $title . $after_title;

        $cat_args = array('orderby' => 'name', 'show_count' => $c, 'hierarchical' => $h);

        if ( $d ) {
            $cat_args['show_option_none'] = __('Select Category');
            wp_dropdown_categories(apply_filters('widget_categories_dropdown_args', $cat_args));
?>

<script type='text/javascript'>
/* <![CDATA[ */
    var dropdown = document.getElementById("cat");
    function onCatChange() {
        if ( dropdown.options[dropdown.selectedIndex].value > 0 ) {
            location.href = "<?php echo get_option('home'); ?>/?cat="+dropdown.options[dropdown.selectedIndex].value;
        }
    }
    dropdown.onchange = onCatChange;
/* ]]> */
</script>

<?php
        } else {
?>
        <ul>
<?php
        $cat_args['title_li'] = '';
        wp_list_categories(apply_filters('widget_categories_args', $cat_args));
?>
        </ul>
<?php
        }

        echo $after_widget;
    }

    function update( $new_instance, $old_instance ) {
        $instance = $old_instance;
        $instance['title'] = strip_tags($new_instance['title']);
        $instance['count'] = $new_instance['count'] ? 1 : 0;
        $instance['hierarchical'] = $new_instance['hierarchical'] ? 1 : 0;
        $instance['dropdown'] = $new_instance['dropdown'] ? 1 : 0;

        return $instance;
    }

    function form( $instance ) {
        //Defaults
        $instance = wp_parse_args( (array) $instance, array( 'title' => '') );
        $title = esc_attr( $instance['title'] );
        $count = isset($instance['count']) ? (bool) $instance['count'] :false;
        $hierarchical = isset( $instance['hierarchical'] ) ? (bool) $instance['hierarchical'] : false;
        $dropdown = isset( $instance['dropdown'] ) ? (bool) $instance['dropdown'] : false;
?>
        <p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e( 'Title:' ); ?></label>
        <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo $title; ?>" /></p>

        <p><input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('dropdown'); ?>" name="<?php echo $this->get_field_name('dropdown'); ?>"<?php checked( $dropdown ); ?> />
        <label for="<?php echo $this->get_field_id('dropdown'); ?>"><?php _e( 'Show as dropdown' ); ?></label><br />

        <input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('count'); ?>" name="<?php echo $this->get_field_name('count'); ?>"<?php checked( $count ); ?> />
        <label for="<?php echo $this->get_field_id('count'); ?>"><?php _e( 'Show post counts' ); ?></label><br />

        <input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('hierarchical'); ?>" name="<?php echo $this->get_field_name('hierarchical'); ?>"<?php checked( $hierarchical ); ?> />
        <label for="<?php echo $this->get_field_id('hierarchical'); ?>"><?php _e( 'Show hierarchy' ); ?></label></p>
<?php
    }

}

function my_categories_init()
{
  register_sidebar_widget(__('My Categories Widget'), 'MY_Widget_Categories');
}

add_action("plugins_loaded", "my_categories_init");
?>