如何在模态上传递php值？ bootstrap 3，

I am new to bootstrap 3 and my coding doesnt seem to pass the php value to a modal? I usually code like this in bootstrap 2++, i decided to add data target also, this is my code:

<a class="btn btn-link"  
   href="#reply<?php echo $product_id; ?>" 
   data-toggle="modal" 
   data-target="#reply<?php echo $product_id; ?>">
       <i class="icon-reply"></i> 
       Reply
</a>

and for the modal:

<a class="btn btn-link"  
    href="#reply<?php echo $product_id; ?>" 
    data-toggle="modal"
    data-target="#reply<?php echo $product_id; ?>">
         <i class="icon-reply"></i> 
         Reply 
</a>

what am i missing?

According to the migration guide from Bootstrap 2 to Bootstrap 3, there were a few non-compatible changes made, specifically to the modal object. It looks like in your case, you need to remove the hide class from your modal in order to work in Bootstrap 3:

[...] you should no longer apply .hide to .modal in your markup.