Assign input to multiple values (Formit2resource)

 <label for="pagetitle">
        Question:
        <span class="error">[[+fi.error.pagetitle]]</span>
    </label>
    <input style="width:270px;" id="pagetitle" name="pagetitle:required" type="text" value="[[+fi.pagetitle]]" />
    <br/>

$pagetitle=$doc->get('pagetitle');
$alias = $doc->cleanAlias($pagetitle);
$doc->set('alias',$alias);

$allFormFields = $hook->getValues(); 
foreach ($allFormFields as $field=>$value)
{

   if ($field !== 'spam' && $field !== 'resource_id'){
         $doc->set($field, $value);
    }
}

$pagetitle=$doc->get('pagetitle');
$alias = $doc->cleanAlias($pagetitle);
$doc->set('alias',$alias);

$doc->set('template', '1');
$doc->save();