Creating default object from empty value through an array - php

Question

I have read multiple threads here about the matter, although none of the solutions seem to be similar to mine. I would have attempted to fix this myself but unable to find anything similar I don't even know where to begin. Why am I getting this error, and what are the proper steps to resolve it?
function handleRequestsave_details()
{
$this->vbulletin->input->clean_array_gpc('p', array('fullname' => TYPE_STR,
'address_1' => TYPE_STR, 'address_2' => TYPE_STR, 'address_city' => TYPE_STR,
'address_state' => TYPE_STR, 'address_zip' => TYPE_STR, 'country' => TYPE_STR,
'phone' => TYPE_STR, 'company' => TYPE_STR));
if ($this->checkDetailsFields('details', $this->vbphrase['memarea_required_fields']))
{
$information = $this->buildInfoArray();
$this->vbulletin->userinfo['ma_info'] = $information;
$this->vbulletin->userinfo['usergroupid'] = $usergrpid;
if ($this->setCustomerNumber($information, $usergrpid))
{
$vbulletin->url = 'members.php?' . $vbulletin->session->vars['sessionurl'] . "do=details";
eval(print_standard_redirect('memarea_saved_details', true, true));
}
}
}
Here are the other functions included in this script, This is not my code it is simply an old product for vBulletin 3.x I am trying to update for my site. this portion throwing the error is when customers enter their billing details to save in their profile.
function checkDetailsFields($requested, $errormessage)
{
if (empty($this->vbulletin->GPC['fullname']) or empty($this->vbulletin->GPC['address_1']) or
empty($this->vbulletin->GPC['address_city']) or empty($this->vbulletin->GPC['address_zip']) or
empty($this->vbulletin->GPC['country']) or empty($this->vbulletin->GPC['phone']))
{
//$GLOBALS['error'] = $errormessage;
eval(standard_error($errormessage));
//$this->handleRequest($requested);
return false;
}
return true;
}
function buildInfoArray()
{
return array('fullname' => $this->vbulletin->GPC['fullname'], 'address_1' => $this->
vbulletin->GPC['address_1'], 'address_2' => $this->vbulletin->GPC['address_2'],
'address_city' => $this->vbulletin->GPC['address_city'], 'address_state' => $this->
vbulletin->GPC['address_state'], 'address_zip' => $this->vbulletin->GPC['address_zip'],
'country' => $this->vbulletin->GPC['country'], 'phone' => $this->vbulletin->GPC['phone'],
'company' => $this->vbulletin->GPC['company']);
}
function setCustomerNumber($ma_info, $usergroup = '', $usevb = true, $userinfo = '')
{
if ($usevb == false)
{
$this->vbulletin->userinfo = &$userinfo;
}
$fcust = $this->fields['custnum'];
$fpass = $this->fields['mpassword'];
$finfo = $this->fields['info'];
$userdm = datamanager_init('User', $this->vbulletin, ERRTYPE_ARRAY);
$userinfo = fetch_userinfo($this->vbulletin->userinfo['userid']);
$userdm->set_existing($userinfo);
if (!$this->vbulletin->userinfo["$fcust"] and !$this->vbulletin->userinfo["$fpass"])
{
$rand = rand($this->vbulletin->options['memarea_numstart'], $this->vbulletin->
options['memarea_numend']);
$num = $this->vbulletin->options['custnum_prefix'] . substr(md5($rand), 0, $this->
vbulletin->options['memarea_custnumleng'] - strlen($this->vbulletin->options['custnum_prefix']));
$userdm->set($fcust, $num);
$pass = substr(md5(time() . $num . $rand . rand(0, 2000)), 0, $this->vbulletin->
options['memarea_custnumleng']);
$userdm->set($fpass, $pass);
$this->sendCustomerInfo($this->vbulletin->userinfo['userid'], $this->vbulletin->
userinfo['username'], $this->vbulletin->userinfo['email'], $num, $pass);
}
if ($usergroup or $usergroup !== '' or $usergroup !== '0')
{
if ($usergroup != $this->vbulletin->userinfo['usergroupid'])
{
$ma_info['oldgroup'] = $this->vbulletin->userinfo['usergroupid'];
$userdm->set('usergroupid', $usergroup);
}
}
if ($ma_info)
{
$ma_info = serialize($ma_info);
$userdm->set($finfo, $ma_info);
}
$userdm->pre_save();
if (count($userdm->errors) == 0)
{
$userdm->save();
return true;
}
else
{
var_dump($userdm->errors);
return false;
}
}