Wordpress: Widget to display custom post type testimonial

widget.php

<?php

//* START WIDGET 
class Testimonial_Widget extends WP_Widget {


	function __construct() {
		parent::__construct(
			'testimonial_widget', // Base ID
			__('Testimonial Widgets', 'marilynhorowitz'), // Name
			array( 'description' => __( 'Widget to display testimonials', 'marilynhorowitz' ), ) // Args
		);
	}

	//* FRONTEND WIDGET DISPLAY 
	public function widget( $args, $instance ) {
		extract( $args );
		$title = apply_filters('widget_title', $instance['title']);
		$NumberOfTestimonial = $instance['NumberOfTestimonial'];
		echo $before_widget;
		if ( $title ) {
			echo $before_title . $title . $after_title;
		}
		$this->getTestimonials($NumberOfTestimonial);
		echo $after_widget;
	}

	//* BACKEND WIDGET FORM  
	public function form( $instance ) {
		if ($instance) {
			$title = esc_attr($instance['title']);
			$NumberOfTestimonial = esc_attr($instance['NumberOfTestimonial']);
		}
		else {
			$title = '';
			$NumberOfTestimonial = '';
		}
		?>
		<!-- WIDGET FORM -->
		<p>
			<label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title', 'marilynhorowitz'); ?></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>
			<label for="<?php echo $this->get_field_id('NumberOfTestimonial'); ?>"><?php _e('Number of Testimonial:', 'marilynhorowitz'); ?></label>
			<select id="<?php echo $this->get_field_id('NumberOfTestimonial'); ?>"  name="<?php echo $this->get_field_name('NumberOfTestimonial'); ?>">
				<?php for($x=1;$x<=10;$x++): ?>
				<option <?php echo $x == $NumberOfTestimonial ? 'selected="selected"' : '';?> value="<?php echo $x;?>"><?php echo $x; ?></option>
				<?php endfor;?>
			</select>
		</p>
		<!-- END OF WIDGET FORM -->

		<?php
	}

	//* UPDATE THE DATA 
	public function update( $new_instance, $old_instance ) {
		$instance = $old_instance;
		$instance['title'] = strip_tags($new_instance['title']);
		$instance['NumberOfTestimonial'] = strip_tags($new_instance['NumberOfTestimonial']);
		return $instance;
	}

	//* QUERY THE TESTIMONIALS POST TYPE
	function getTestimonials($NumberOfTestimonial) {
		global $post;
		$args = array(
			'post_type' => 'testimonial_type',
			'showposts' => $NumberOfTestimonial,
			);

		$tlistings = new WP_Query( $args );

		if ( $tlistings->have_posts() ) {
			echo '<ul>';

			while ( $tlistings->have_posts() ) {
				$tlistings->the_post();
				echo '<li>';
				echo '<blockquote>' . get_the_excerpt(). '</blockquote>';
				echo '<p>' . get_the_title(). '</p>';
				echo '</li>';
			}
			echo '<ul>';
		}
		else {
			echo '<p>No Testimonial yet</p>';

		}

		//* NOW WE NEED TO RESET WP POST DATA 
		wp_reset_postdata();

	// END OF getTestimonials 
	}
}

//* REGISTER THE WIDGET 
function register_testimonial_widget() {
    register_widget( 'Testimonial_Widget' );
}
add_action( 'widgets_init', 'register_testimonial_widget' );
?>