WP multi select widget

<?php
class Category_Tabs_Widget extends WP_Widget {

    function __construct() {

        parent::__construct(

            // base ID of the widget
            'category_tabs_widget',

            // name of the widget
            __('Categpry Tabs', 'custom' ),

            // widget options
            array (
                'description' => __( 'Creates tabs based on selected widgets and returns 4 posts.', 'custom' )
            )

        );

    }

    function form( $instance ) {


         if( $instance )
            $select = $instance['select'];
        else
             $select ='';

        // markup for form

     ?>
       <p>
        <label for="<?php echo $this->get_field_name( 'title' ); ?>"><?php _e('Title:', 'thstlang') ?></label>
        <input type="text" class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name('select'); ?>" value="<?php echo $instance['title']; ?>" />
    </p>

    <!-- Category Select Menu -->
    <p>
        <select id="<?php echo $this->get_field_id('select'); ?>" name="<?php echo $this->get_field_name('select'); ?>[]" class="widefat" style="width:100%;" multiple="multiple">
            <?php foreach(get_terms('product_cat','hide_empty=1') as $term) { ?>
                <option <?php selected( $instance['select'], $term->term_id ); ?> value="<?php echo $term->term_id; ?>"><?php echo $term->name; ?></option>
            <?php } ?>
        </select>
    </p>

   <?php
    }


    function update( $new_instance, $old_instance ) {

       $instance = $old_instance;
        $instance['select'] = esc_sql( $new_instance['select'] );
        return $instance;


    }

    function widget( $args, $instance ) {

        // kick things off
        extract( $args );
        echo $before_widget;

        print_r();
     //   echo $before_title . 'In this section:' . $after_title;

        // run a query if on a page




    ?>

        <div class="wpb_tabs wpb_content_element" data-interval="0">
                <div class="wpb_wrapper wpb_tour_tabs_wrapper ui-tabs vc_clearfix ui-widget ui-widget-content ui-corner-all">
                    <ul class="wpb_tabs_nav ui-tabs-nav vc_clearfix ui-helper-reset ui-helper-clearfix ui-widget-header ui-corner-all" role="tablist"><li class="ui-state-default ui-corner-top" role="tab" tabindex="-1" aria-controls="tab-1407172281-1-37" aria-labelledby="ui-id-1" aria-selected="false" aria-expanded="false"><a href="#tab-1407172281-1-37" class="ui-tabs-anchor" role="presentation" tabindex="-1" id="ui-id-1">Tab 1</a></li><li class="ui-state-default ui-corner-top" role="tab" tabindex="-1" aria-controls="tab-1407172423209-2-9" aria-labelledby="ui-id-2" aria-selected="false" aria-expanded="false"><a href="#tab-1407172423209-2-9" class="ui-tabs-anchor" role="presentation" tabindex="-1" id="ui-id-2">Tab 2</a></li><li class="ui-state-default ui-corner-top ui-tabs-active ui-state-active" role="tab" tabindex="0" aria-controls="tab-1407172430389-2-4" aria-labelledby="ui-id-3" aria-selected="true" aria-expanded="true"><a href="#tab-1407172430389-2-4" class="ui-tabs-anchor" role="presentation" tabindex="-1" id="ui-id-3">Tab 3</a></li></ul>
                        <div id="tab-1407172281-1-37" class="wpb_tab ui-tabs-panel wpb_ui-tabs-hide vc_clearfix ui-widget-content ui-corner-bottom" aria-labelledby="ui-id-1" role="tabpanel" aria-hidden="true" style="display: none;">

                        <div class="wpb_text_column wpb_content_element ">
                            <div class="wpb_wrapper">
                                <p>Lorem ipsum pharetra lorem felis. Aliquam egestas consectetur elementum class aptentea taciti sociosqu ad litora torquent perea conubia nostra lorem consectetur adipiscing elit. Donec vestibulum justo a diam ultricies pellentesque.</p>

                            </div>
                        </div>

                        </div>
                </div>
            </div>


<?php

echo $after_widget;
 }
}
?>








<?php
function category_tabs_widget_regiseter() {

    register_widget( 'Category_Tabs_Widget' );

}
add_action( 'widgets_init', 'category_tabs_widget_regiseter' );
?>