Unique dashboard for multipleusers

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PHP

CodeIgniter

Hi coders

i have an admin web app in codeigniter that works perfectly but wanted to customize it for each user to have a unique dashboard i.e user A dashboard,
user B dashboard, user C dashboard, etc see below for my code
in my controller folder
Auth.php

public function log(){

if($_POST){
$query = $this->login_model->validate_user();

//-- if valid
if($query){
$data = array();
foreach($query as $row){
$data = array(
'id' => $row->id,
'name' => $row->first_name,
'email' =>$row->email,
'role' =>$row->role,
'is_login' => TRUE
);
$this->session->set_userdata($data);
$url = base_url('admin/dashboard');

}
echo json_encode(array('st'=>1,'url'=> $url)); //--success
}else{
echo json_encode(array('st'=>0)); //-- error
}
}else{
$this->load->view('auth',$data);
}
}

What I have tried:

searching stackoverflow and google