class Spr_Categories_Widget extends WP_Widget {
    public function __construct() {
        $widget_options = array(
            'classname' => 'widget_custom_categories_widget',
            'description' => 'This is a Custom Blog Categories Widget',
        );
        parent::__construct( 'custom_categories_widget', 'Custom Categories Widget', $widget_options );
    }

    public function form( $instance ) {
        $title = ! empty( $instance['title'] ) ? $instance['title'] : '';
        $name = ! empty( $instance['name'] ) ? $instance['name'] : '';
        $categories = get_categories( array(
            'orderby' => 'name',
            'parent'  => 0
        ) );
        ?>
        <p>
            <label for="<?php echo $this->get_field_id( 'title' ); ?>">Title:</label>
            <input type="text" id="<?php echo $this->get_field_id( 'title' ); ?>" class="widefat" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo esc_attr( $title ); ?>" />
        </p>
        <p>
            <label for="Categories">Categories:</label>
        </p>
        <?php
        foreach ( $categories as $category ) {
            ?>
            <p>
            <input type="text" id="<?php echo $this->get_field_id($category->slug); ?>" class="widefat" name="<?php echo $this->get_field_name( 'name' ); ?>" value="<?php echo esc_attr( $name ); ?>" />
            </p>
            <?php

        }
        ?>

        <?php

    }

    public function update( $new_instance, $old_instance ) {
        $instance = $old_instance;
        $instance[ 'title' ] = strip_tags( $new_instance[ 'title' ] );
        $instance[ 'name' ] = strip_tags( $new_instance[ 'name' ] );
        return $instance;
    }

    public function widget( $args, $instance ) {
        $title = apply_filters( 'widget_title', $instance[ 'title' ] );
        $category_title = apply_filters( 'widget_title', $instance[ 'name' ] );

        echo $args['before_widget'] . $args['before_title'] . $title . $args['after_title']; ?>

        <p><?php echo $category_title ?></p>

        <?php echo $args['after_widget'];
    }

}
function spr_custom_categories_widget() {
    register_widget( 'Spr_Categories_Widget' );
}
add_action( 'widgets_init', 'spr_custom_categories_widget' );