<div class="img-div ">
   <?php ...?>
   <img src="<?php echo $weburl . 'uploads/' . $data['id']?>" class="img-responsive choice">
   <?php ... ?>
</div>

<div class="col-md-4 material-set" class="target">
</div>
<div class="col-md-4 material-set" class="target">
</div>

$(document).ready(function(){
    $(".choice").draggable({
        snap: ".target"
    });
});