<?php class Related_Posts extends WP_Widget
{
	public function __construct()
	{
		parent::__construct(
			'related_posts_widget', // Base ID
			'Related Posts', // Name
			array('description' => __('Related Posts Widget', 'qode'),) // Args
		);
	}

	public function widget($args, $instance)
	{
		global $post;
		extract($args);
		$title = apply_filters('widget_title', empty($instance['title']) ? __('Related Posts', 'qode') : $instance['title'], $instance, $this->id_base);
		if (empty($instance['number']) || !$number = absint($instance['number']))
			$number = 10;

		echo $before_widget;
		if (!empty($title))
			echo $before_title . $title . $after_title;
?>

		<?php
		$tags = wp_get_post_tags(get_the_ID());

		if ($tags) {
			$tag_ids = array();
			foreach ($tags as $individual_tag) {
				$tag_ids[] = $individual_tag->term_id;
			}
			$args = array(
				'tag__in' => $tag_ids,
				'post__not_in' => array(get_the_ID()),
				'posts_per_page' => $number // Number of related posts to display.
			);
			$related_query = new WP_Query($args);
			if ($related_query->have_posts()) {
				while ($related_query->have_posts()) : $related_query->the_post();
		?>
					<div class="post no_image">
						<div class="text">
							<a itemprop="url" href="<?php the_permalink() ?>"> <?php the_title(); ?> </a>
						</div>
					</div>
		<?php
				endwhile;
			}
			wp_reset_query();
		}
		?>
	<?php echo $after_widget;
	}

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

	public function form($instance)
	{
		$title = isset($instance['title']) ? esc_attr($instance['title']) : '';
		$number = isset($instance['number']) ? absint($instance['number']) : 5;
	?>
		<p>
			<label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:', 'qode'); ?></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>
			<label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Number of posts:', 'qode'); ?></label>
			<input class="widefat" id="<?php echo $this->get_field_id('number'); ?>" name="<?php echo $this->get_field_name('number'); ?>" type="text" value="<?php echo esc_attr($number); ?>" />
		</p>
<?php
	}
}
add_action('widgets_init', function () {
	register_widget('Related_Posts');
});
?>