<option value=""><?php echo attribute_escape(__('Kategori Seçin')); ?></option> 
             <?php 
                  $categories=  get_categories('hide_empty=0&orderby=name'); 
                  foreach ($categories as $cat) 
                  {
                  $option = '<option value="'.$cat->term_id.'">';
                $option .= $cat->cat_name;
                $option .= ' ('.$cat->category_count.')';
                $option .= '</option>';
                echo $option;
                  }
             ?>
            </select>