wordpress plugin [widget] - show recent comments with category

index.php

<?php
/*
Plugin Name: Extended Commnets
Plugin URI: https://gist.github.com/gists/3479610
Description: wordpress plugin [widget] - show recent comments with category
Version: 0.1
Author: Tareq Jobayere
Author URI: http://twitter.com/tareq_jobayere
License: i don't know 
*/

class tarex_extended_Comments extends WP_Widget {

	function __construct()
	{	
		$params = array(
			'description' => 'Display recent comments',
			'name'        => 'Extended Comments'	
		);

		parent::__construct('Extended','',$params);

	}


	public function form($instance)
	{
		extract($instance);
		?>
		<p>
		    <label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?></label>
			<input 
				type="text" 
				class="widefat"
				id="<?php  echo $this->get_field_id('title'); ?>" 
				name="<?php echo $this->get_field_name('title'); ?>"
				value="<?php if( isset($title) ) echo esc_attr($title);?>" 
			/>
		</p>

		<p>
			<label for="<?php echo $this->get_field_id('tcount'); ?>"><?php _e('Number of comments to show:'); ?></label>
			<input 
				type="text"
				id="<?php echo $this->get_field_id('tcount'); ?>"
				name="<?php echo $this->get_field_name('tcount'); ?>" 
				value="<?php if( isset($title) ) echo esc_attr($tcount);?>"
				size="3"
			/>

		</p>

		<p>
			<?php  $link_cats = get_terms('category', 'orderby=count&hide_empty=0');  ?>

			<label for="<?php echo $this->get_field_id('category'); ?>"><?php _e( 'Select Category:' ); ?></label>
			
			<select class="widefat" id="<?php echo $this->get_field_id('category'); ?>" name="<?php echo $this->get_field_name('category'); ?>">
				<option value="0"><?php _ex('All', 'links widget'); ?></option>
				<?php
				foreach ( $link_cats as $link_cat ) {
					echo '<option value="' . intval($link_cat->term_id) . '"'
						. ( $link_cat->term_id == $instance['category'] ? ' selected="selected"' : '' )
						. '>' . $link_cat->name . "</option>\n";
				}
				?>
			</select>

		</p>
<?php
	} //end of form


	// showing on the page
	public function widget($args , $instance)
	{

		extract($args);
		extract($instance);

		$title = apply_filters('widget_title', $title);


		// personal checking
		if( empty($title) ){ 
			$title = "Recent Comments";
		}
		if( empty($tcount) ){
			$tcount = 10;
		}
		if( empty($category) ){
		 $category = 1;
		}


		$item = array(
		'status' => 'approve',
		'number' => $tcount,
		'post_status' => 'publish'
		);
		$comments = get_comments($item);


		$output = '';
		$i=0;

		$output.= $before_widget;

			$output .= $before_title . $title . $after_title;

			$output .= '<ul id="recentcomments">';

				foreach ($comments as $comment)
				{
				    $comm_post_id = $comment->comment_post_ID;
				    
				    if (!in_category($category , $comm_post_id))
				        continue;
				    $i++;

				    $commentTime = date('M j,  H:i a',strtotime($comment->comment_date) );

	$CommentTxt = trim( mb_substr( strip_tags( apply_filters( 'comment_text', $comment->comment_content )), 0, 100 )); //100 is length
				
				if( strlen($comment->comment_content) > 100){
					$CommentTxt .= "...";
				}
   		

	   		     $output .= '<li class="recentcomments">';

	   		     $output .= '<a href="'.esc_url( get_comment_link($comment->comment_ID) ).'">'.get_comment_author_link($comment->comment_ID).'</a>';

	   		     $output .= ' on ';

	   		     $output .= '<a href="'.esc_url( get_comment_link($comment->comment_ID) ).'">'.get_the_title($comment->comment_post_ID).' </a>';

	   		    

	   		     $output .= '<br><small>'.$commentTime.'</small>';

	   		     $output .= '<p>'.$CommentTxt.'</p>';


	   		     $output .='</li>';


				    if ($i >= $tcount) break;
				}


			$output .= '</ul>';


		$output.= $after_widget;

		echo $output;

	}// end of widget

}// end of class


add_action('widgets_init', 'ex_Init');

function ex_Init() {

	register_widget('tarex_extended_Comments');
}
?>