O si podéis con esto, mejor !
Código PHP:
<div id="custom-fields"
data-customfield-values='<?=json_encode($ad->custom_columns(), JSON_HEX_APOS | JSON_HEX_QUOT)?>'
<?=(Auth::instance()->get_user()->id_role == Model_Role::ROLE_ADMIN OR Auth::instance()->get_user()->id_role == Model_Role::ROLE_MODERATOR) ? 'data-admin-privilege': NULL?>
>
<div id="custom-field-template" class="form-group hidden">
<div class="col-sm-8">
<div data-label></div>
<div data-input></div>
</div>
</div>
</div>
<?endif?>