Recent comments for iStudio theme

istudio-recent-comments.php

<?php
/**
 * Plugin Name: iStudio Recent Comments
 * Version: 1.0
 * Plugin URI: http://gist.github.com/393013
 * Description: Recent comments for iStudio theme
 * Author: Sergey Tikhonov
 * Author URI: http://haqu.net
 */
class WP_Widget_iStudio_Recent_Comments extends WP_Widget {

  function WP_Widget_iStudio_Recent_Comments() {
    $widget_ops = array(
      'classname' => 'widget_istudio_recent_comments',
      'description' => __( 'The most recent comments for iStudio theme' ) );
    $this->WP_Widget('istudio-recent-comments', __('iStudio Recent Comments'), $widget_ops);
    $this->alt_option_name = 'widget_istudio_recent_comments';

    add_action( 'comment_post', array(&$this, 'flush_widget_cache') );
    add_action( 'transition_comment_status', array(&$this, 'flush_widget_cache') );
  }

  function flush_widget_cache() {
    wp_cache_delete('istudio_recent_comments', 'widget');
  }

  function widget( $args, $instance ) {
    global $wpdb, $comments, $comment;

    extract($args, EXTR_SKIP);
    $title = apply_filters('widget_title', empty($instance['title']) ? __('Recent Comments') : $instance['title']);
    if ( !$number = (int) $instance['number'] )
      $number = 5;
    else if ( $number < 1 )
      $number = 1;
    else if ( $number > 15 )
      $number = 15;

    if ( !$comments = wp_cache_get( 'istudio_recent_comments', 'widget' ) ) {
      $comments = $wpdb->get_results("SELECT $wpdb->comments.* FROM $wpdb->comments JOIN $wpdb->posts ON $wpdb->posts.ID = $wpdb->comments.comment_post_ID WHERE comment_approved = '1' AND post_status = 'publish' ORDER BY comment_date_gmt DESC LIMIT 15");
      wp_cache_add( 'istudio_recent_comments', $comments, 'widget' );
    }

    $comments = array_slice( (array) $comments, 0, $number );
?>
    <?php echo $before_widget; ?>
      <?php if ( $title ) echo $before_title . $title . $after_title; ?>
      <ul><?php
      $wpchres = get_option('blog_charset');
      if ( $comments ) : foreach ( (array) $comments as $comment) :
      echo  '<li class="comment">' . sprintf(_x('%1$s: %2$s','widgets'), '<a href="' . esc_url(get_comment_link($comment->comment_ID)) . '">' . get_comment_author() . '</a>', mb_substr($comment->comment_content,0,15,$wpchres) . '&hellip;') . '</li>';
      endforeach; endif;?></ul>
    <?php echo $after_widget; ?>
<?php
  }

  function update( $new_instance, $old_instance ) {
    $instance = $old_instance;
    $instance['title'] = strip_tags($new_instance['title']);
    $instance['number'] = (int) $new_instance['number'];
    $this->flush_widget_cache();

    $alloptions = wp_cache_get( 'alloptions', 'options' );
    if ( isset($alloptions['widget_istudio_recent_comments']) )
      delete_option('widget_istudio_recent_comments');

    return $instance;
  }

  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:'); ?></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('number'); ?>"><?php _e('Number of comments to show:'); ?></label>
    <input id="<?php echo $this->get_field_id('number'); ?>" name="<?php echo $this->get_field_name('number'); ?>" type="text" value="<?php echo $number; ?>" size="3" /><br />
    <small><?php _e('(at most 15)'); ?></small></p>
<?php
  }
}

// Register widget
add_action('widgets_init', create_function('', 'return register_widget("WP_Widget_iStudio_Recent_Comments");'));

?>