Как добавить изображения к катерогиям в классе wp_widget_categories?

class WP_Widget_Categories extends WP_Widget { 
 
    /** 
     * Sets up a new Categories widget instance. 
     * 
     * @since 2.8.0 
     * @access public 
     */ 
    public function __construct() { 
        $widget_ops = array( 
            'classname' => 'widget_categories',  
            'description' => __( 'A list or dropdown of categories.' ),  
            'customize_selective_refresh' => true,  
 ); 
        parent::__construct( 'categories', __( 'Categories' ), $widget_ops ); 
    } 
 
    /** 
     * Outputs the content for the current Categories widget instance. 
     * 
     * @since 2.8.0 
     * @access public 
     * 
     * @param array $args     Display arguments including 'before_title', 'after_title',  
     *                        'before_widget', and 'after_widget'. 
     * @param array $instance Settings for the current Categories widget instance. 
     */ 
    public function widget( $args, $instance ) { 
        static $first_dropdown = true; 
 
        /** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */ 
        $title = apply_filters( 'widget_title', empty( $instance['title'] ) ? __( 'Categories' ) : $instance['title'], $instance, $this->id_base ); 
 
        $c = ! empty( $instance['count'] ) ? '1' : '0'; 
        $h = ! empty( $instance['hierarchical'] ) ? '1' : '0'; 
        $d = ! empty( $instance['dropdown'] ) ? '1' : '0'; 
 
        echo $args['before_widget']; 
        if ( $title ) { 
            echo $args['before_title'] . $title . $args['after_title']; 
        } 
 
        $cat_args = array( 
            'orderby' => 'name',  
            'show_count' => $c,  
            'hierarchical' => $h 
 ); 
 
        if ( $d ) { 
            $dropdown_id = ( $first_dropdown ) ? 'cat' : "{$this->id_base}-dropdown-{$this->number}"; 
            $first_dropdown = false; 
 
            echo '<label class="screen-reader-text" for="' . esc_attr( $dropdown_id ) . '">' . $title . '</label>'; 
 
            $cat_args['show_option_none'] = __( 'Select Category' ); 
            $cat_args['id'] = $dropdown_id; 
 
            /** 
             * Filters the arguments for the Categories widget drop-down. 
             * 
             * @since 2.8.0 
             * 
             * @see wp_dropdown_categories() 
             * 
             * @param array $cat_args An array of Categories widget drop-down arguments. 
             */ 
            wp_dropdown_categories( apply_filters( 'widget_categories_dropdown_args', $cat_args ) ); 
            ?> 
 
<script type='text/javascript'> 
/* <![CDATA[ */ 
(function() { 
    var dropdown = document.getElementById( "<?php echo esc_js( $dropdown_id ); ?>" ); 
    function onCatChange() { 
        if ( dropdown.options[ dropdown.selectedIndex ].value > 0 ) { 
            location.href = "<?php echo home_url(); ?>/?cat=" + dropdown.options[ dropdown.selectedIndex ].value; 
        } 
    } 
    dropdown.onchange = onCatChange; 
})(); 
/* ]]> */ 
</script> 
 
<?php 
        } else { 
?> 
        <ul> 
<?php 
        $cat_args['title_li'] = ''; 
 
        /** 
         * Filters the arguments for the Categories widget. 
         * 
         * @since 2.8.0 
         * 
         * @param array $cat_args An array of Categories widget options. 
         */ 
        wp_list_categories( apply_filters( 'widget_categories_args', $cat_args ) ); 
?> 
        </ul> 
<?php 
        } 
 
        echo $args['after_widget']; 
    } 
 
    /** 
     * Handles updating settings for the current Categories widget instance. 
     * 
     * @since 2.8.0 
     * @access public 
     * 
     * @param array $new_instance New settings for this instance as input by the user via 
     *                            WP_Widget::form(). 
     * @param array $old_instance Old settings for this instance. 
     * @return array Updated settings to save. 
     */ 
    public function update( $new_instance, $old_instance ) { 
        $instance = $old_instance; 
        $instance['title'] = sanitize_text_field( $new_instance['title'] ); 
        $instance['count'] = !empty($new_instance['count']) ? 1 : 0; 
        $instance['hierarchical'] = !empty($new_instance['hierarchical']) ? 1 : 0; 
        $instance['dropdown'] = !empty($new_instance['dropdown']) ? 1 : 0; 
 
        return $instance; 
    } 
 
    /** 
     * Outputs the settings form for the Categories widget. 
     * 
     * @since 2.8.0 
     * @access public 
     * 
     * @param array $instance Current settings. 
     */ 
    public function form( $instance ) { 
        //Defaults 
        $instance = wp_parse_args( (array) $instance, array( 'title' => '') ); 
        $title = sanitize_text_field( $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 esc_attr( $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( 'Display 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 
    } 
 
}