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How i can add BBcode in this function?:

echo '<div class="phdr"><b>description:</b> ' . functions::checkout($res_down['rus_name']) . '</div>';
    echo '<div class="list1"><form action="index.php?act=edit_about&amp;id=' . $id . '" method="post">
   <small>Maximum of 500 characters</small><br /><textarea name="opis">' . htmlentities($res_down['about'], ENT_QUOTES, 'UTF-8') . '</textarea>';
    echo '<br /><input type="submit" name="submit" value="Send"/></form></div>';
    echo '<div class="phdr"><a href="index.php?act=view&amp;id=' . $id . '">Back</a></div>';