Simple Twitter Widget for WordPress

gt_social_twitter_widget.php

/** 
 * Twitter Widget
 *
 */
class GT_Social_Twitter extends WP_Widget {

	function GT_Social_Twitter(){
		$widget_ops = array( 'classname' => 'twitter', 'description' => _x('A widget for displaying your recent tweets.', 'gt') );
		/* Widget control settings. */
		$control_ops = array( 'width' => 300, 'height' => 350, 'id_base' => 'gt-twitter' );

		parent::WP_Widget( false, _x('Recent Tweets', 'gt'), $widget_ops);
	}
	
	function form( $instance ) {
		$instance = wp_parse_args( (array) $instance, array( 'title' => _x('Most Recent Tweets', 'gt'), 'id'=>'', 'number'=>3, 'btn_text'=> _x('Follow Us', 'gt') )); ?>

		<p><label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e('Title', 'gt'); ?></label><br />
		<input id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php if ( isset($instance['title']) ) echo $instance['title']; ?>" class="widefat" />
		</p>
		<p><label for="<?php echo $this->get_field_id( 'id' ); ?>"><?php _e('Twitter user:', 'gt'); ?></label><br />
		<input id="<?php echo $this->get_field_id( 'id' ); ?>" name="<?php echo $this->get_field_name( 'id' ); ?>" value="<?php if ( isset($instance['id']) ) echo $instance['id']; ?>" class="widefat" />
		</p>
		<p><label for="<?php echo $this->get_field_id( 'number' ); ?>"><?php _e('Number of tweets:', 'gt'); ?></label><br />
		<input id="<?php echo $this->get_field_id( 'number' ); ?>" name="<?php echo $this->get_field_name( 'number' ); ?>" value="<?php if ( isset($instance['number']) ) echo $instance['number']; ?>" class="widefat" />
		</p>
		<p><label for="<?php echo $this->get_field_id( 'btn_text' ); ?>"><?php _e('Button Text:', 'gt'); ?></label><br />
		<input id="<?php echo $this->get_field_id( 'btn_text' ); ?>" name="<?php echo $this->get_field_name( 'btn_text' ); ?>" value="<?php if ( isset($instance['btn_text']) ) echo $instance['btn_text']; ?>" class="widefat" />
		</p>
	<?php
	}
	
	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;

		/* Create widget settings instances. */
		$instance['title'] = strip_tags( $new_instance['title'] );
		$instance['id'] = $new_instance['id'];
		$instance['number'] = $new_instance['number'];
		$instance['btn_text'] = $new_instance['btn_text'];
		return $instance;
	}

	function widget( $args, $instance ) {
		extract( $args );

		$title = apply_filters('widget_title', $instance['title'] );
		$id = str_replace(array('&nbsp;', '@'), '', $instance['id']);
		$btn_text = $instance['btn_text'];
		$number = $instance['number'] ? $instance['number'] : 3;

		/* Widget template */
		echo $before_widget;
	   	if ( $title ) echo $before_title . $title . $after_title;
		
		// Get the feed if it's not cached
		if( false === ($feed = get_transient('gt_twitter_feed')) ){
			$user = $id;
			$result = wp_remote_get("http://api.twitter.com/1/statuses/user_timeline.json?include_rts=1&screen_name=". $user ."&count=" . $number);
			$feed = wp_remote_retrieve_body( $result );
			
			// If the Twitter rate limit hasn't failed, set transients
			if( strpos($feed, '{"error') === false ){
				set_transient('gt_twitter_feed', $feed, 900);
				set_transient('gt_twitter_feed_fallback', $feed, 86400);
			
			// Fallback to an old value.
			}else{
				$feed = get_transient('gt_twitter_feed_fallback');
			}
		}

		if ( $feed ) :
			$tweets = json_decode($feed, true);

			echo '<ol>';
				$tweet_counter = 0;
				foreach($tweets as $tweet):
					$tweet_counter++;
					$pattern = '/\@(\w+)/';
					$replace = '<a rel="external nofollow" href="http://twitter.com/$1">@$1</a>';
					$tweet['text'] = preg_replace($pattern, $replace , $tweet['text']);
					$tweet['text'] = make_clickable($tweet['text']);
					echo '<li>';
						echo '<span class="tweet-content">';
							echo $tweet['text'];
						echo '</span> ';
						echo '<span class="tweet-date"><a rel="external nofollow" href="http://twitter.com/'.$id.'/statuses/'. $tweet['id'].'/">';
						echo 'about ' . human_time_diff( strtotime($tweet['created_at'])) . ' ago';
						//echo date("F j, g:i A",strtotime($tweet['created_at']));
						echo '</a></span>';						
					echo '</li>';	
				endforeach;
			echo '</ol>';
			echo "<a href='http://twitter.com/$id' rel='external nofollow' class='btn-blue right'>$btn_text</a>";
		else:
			echo '<p>Error requesting the latest tweets. Please try again later.</p>';
		endif;

	echo $after_widget;
	}
}


/* Register widgets */
function gt_register_widgets() {
	register_widget( 'GT_Social_Twitter' );
}

/* Load widget with widget_init function */
add_action( 'widgets_init', 'gt_register_widgets' );