コード

[php]
class Get_Topsy_Trackback {
private $counter = 0;
public $response;
public $trackback;

function __construct($permalink){
$topsy = json_decode(file_get_contents("http://otter.topsy.com/trackbacks.json?url=".$permalink));
$this->response = $topsy->response;
}

function get_all_topsy(){
return count($this->response->list);
}

function have_topsy(){
if(isset($this->response->list[$this->counter])){
return true;
}else{
return false;
}
}

function the_topsy(){
$this->trackback = $this->response->list[$this->counter];
$this->counter ++;
}

function get_topsy(){
return $this->trackback;
}

function get_the_content(){
$content = $this->trackback->content;
return preg_replace(‘/(https?:\/\/[a-zA-Z0-9\.\/:%,!#~*@&_-]+)/’,'<a href="\0" title="\0">\0</a>’,$content);
}
function the_content(){
echo "<p>".$this->get_the_content()."</p>";
}

function get_the_author(){
return $this->trackback->author;
}

function get_the_author_nick(){
return $this->get_the_author()->nick;
}
function the_author_nick(){
echo $this->get_the_author_nick();
}

function get_the_author_link(){
return $this->get_the_author()->url;
}
function the_author_link(){
echo $this->get_the_author_link();
}

function the_author(){
echo ‘<a href="’.$this->get_the_author_link().’" class="author">’.$this->get_the_author_nick().'</a>’;
}

function get_the_author_avator(){
return $this->get_the_author()->photo_url;
}
function the_author_avator( $size = 48 ){
echo ‘<img src="’.$this->get_the_author_avator().’" alt="’.$this->get_the_author_nick().’" width="’.$size.’" height="’.$size.’" />’;
}

function get_the_time( $format = "Y-m-d" ){
return date($format,$this->trackback->date);
}
function the_time( $format = "Y-m-d" ){
echo $this->get_the_time( $format );
}

function get_the_permalink(){
return $this->trackback->permalink_url;
}
function the_permalink(){
echo $this->get_the_permalink();
}
}
[/php]

基本的にgetから始まるメソッドはreturnで返し、theから始まるメソッドはechoします。実にWordPressっぽいですよね？

使い方

こんな感じで使います。
[php]
<?php
$topsy = new Get_Topsy_Trackback($URL);
if($topsy->have_topsy()):?>
<p><?php echo $topsy->get_all_topsy();?>回つぶやかれました。</p>
<ul>
<?php while($topsy->have_topsy()):$topsy->the_topsy(); ?>
<li>
<a href="<?php $topsy->the_author_link();?>"><?php $topsy->the_author_avator()?></a>
<div class="content"><?php $topsy->the_author();?><?php $topsy->the_content();?></div>
<div class="meta">Post:<a href="<?php $topsy->the_permalink();?>"><?php $topsy->the_time("Y-m-d");?></a></div>
</li>
<?php endwhile; ?>
</ul>
<?php else:?>
<p>まだだれもつぶやいていない様子です。</p>
<?php endif;?>
[/php]

インスタンス化するときに、URLを引数に入れてあげましょう。WordPressで使うのならばget_permalink(get_the_ID())とかですね。
あとはWordPressっぽいループタグを書いて、WordPressっぽいテンプレートタグを書いてあげればオーケーです。