如何获取URL的标题？

Question

if ($link == true) { 
    // Links 
    $link_search = '/\[a\](.*?)\[\/a\]/i'; 

    if (preg_match_all($link_search, $text, $matches)) { 

     foreach ($matches[1] as $match) { 
      $match_decode = urldecode($match); 
      $match_url = $match_decode; 

      if (!preg_match("/http\:\/\//", $match_decode)) { 
       $match_url = 'http://' . $match_url; 
      } 

      $text = str_replace('[a]' . $match . '[/a]', '<a href="' . strip_tags($match_url) . '" target="_blank" rel="nofollow">' . $match_decode . '</a>', $text); 
     } 
    } 
} 

上面的代码显示了发布的链接和点击重定向到链接的时间。我想要显示的目标链接。例如。计算器显示在后，并点击时需要用户http://stackoverflow.com