Extend with Share Helper

[eluser]Ludovic-r[/eluser]
Hi!

I have 2 question that I can't resolve myself :

First, I try to create a custom CMS with codeigniter with a social part and I use the Share Helper (http://codeigniter.com/wiki/Share-helper/). In the view I have this :

Code:

<?
// in Controller
$url    = 'http://www.myurl.com';
$text    = 'My text';
$image    = 'http://www.myurl.com/myimage.jpg';
?>

<!-- this is View -->
<p>
    <a >$url, 'text'=>$text))?&gt;">Share to Twitter</a>
    <a >$url, 'text'=>$text))?&gt;">Share to Facebook</a>
    <a >$url, 'image'=>$image, 'text'=>$text))?&gt;">Share to Google Buzz</a>
</p>
<p>
    &lt;?=share_button('twitter',    array('url'=>$url, 'text'=>$text, 'type'=>'iframe'))?&gt;
    &lt;?=share_button('facebook',    array('url'=>$url, 'text'=>$text))?&gt;
    &lt;?=share_button('buzz',        array('url'=>$url, 'image'=>$image, 'text'=>$text))?&gt;
</p>

The problem is that I can't put a variable in the $url parameter (like $url = base_url().$post_title because when I click to share on Twitter it said that the url in $url variable is incorrect. Do you have some ideas to share about this ?

The second thing is that I would like to add some social services to this Helper (like stumbleupon, tumblr, digg) Do you have any ideas or issues to do that?

Your help will be very appreciated!