array (size=2) 0 => object(stdClass)[40] public 'role' => string '2' (length=1) 1 => object(stdClass)[41] public 'role' => string '5' (length=1)

DB TABLE
id user_id role
1  4       2
2  4       5

//get logged user roles
public function user_roles($id){
    $userDB  = $this->quickDB();
    $userdata = $userDB->query("SELECT role
                            FROM role_assignment
                            WHERE user_id = $id
                            ")->result();
    $userDB->close();
    return ($userdata);
}

public function user_roles()
{
    $roles=$this->Master_model->user_roles('4');

    if (in_array("1", $roles))
    {
        echo "Admin<br>";
    }
    if (in_array("2", $roles))
    {
        echo "Teacher<br>";
    }
    if (in_array("5", $roles))
    {
        echo "Academic<br>";
    }
}

$userdata = $userDB->query("SELECT role
                        FROM role_assignment
                        WHERE user_id = $id
                        ")->result_array();

$user_roles = array();
foreach ($userdata as $val) {
    $user_roles[] = $val['role'];
}
return $user_roles;