CodeIgniter Session do not saving Array - arrays

Question

i using CodeIgniter Session with database for save a array with $_FILES, but don't save. I do this (but the array never increment):
The post of form, redirects to himself.
Function to upload e load the page of upload.
public function getUpload($codtemp, $codmessage){
$this->load->library('session');
$this->layout = '';
$data = array();
$data['codmessage'] = $codmessage;
$data['codtemp'] = $codtemp;$tempfiles= $this->session->userdata('tempfiles');
if (isset($_FILES['attachment']))
{
$files = $this->fixGlobalFilesArray($_FILES['attachment']);
foreach($files as $file)
{
$tempfiles[$codtemp][] = $file;
}
$this->session->set_userdata('tempfiles', $tempfiles);
unset($files);
}
$this->parser->parse('attachment_upload', $data);
}
private static function fixGlobalFilesArray($files) {
$ret = array();
if(isset($files['tmp_name']))
{
if (is_array($files['tmp_name']))
{
foreach($files['name'] as $idx => $name)
{
$ret[$idx] = array(
'name' => $name,
'tmp_name' => $files['tmp_name'][$idx],
'size' => $files['size'][$idx],
'type' => $files['type'][$idx],
'error' => $files['error'][$idx]
);
}
}
else
{
$ret = $files;
}
}
else
{
foreach ($files as $key => $value)
{
$ret[$key] = self::fixGlobalFilesArray($value);
}
}
return $ret;
}

Answer 1

Before save the array, serialize the data and after get the data, unserialize. If data is empty, create a array