Setting class variables

[fileserverdirect]

I haven't posted here in a year or so, so I'm a little rusty with my php. I am currently making a facebook game. The facebook aspect is not relevant here because my php coding is not even outputting the code. The class is meant to do two things: put all user data from the database into variables like $user->$email etc... The second is to output a string not from the database like $user->_fn where "fn" is a string. Here is the user class:

class user
    {
        public function getuser($fbuid)
            {
                $sql="SELECT * FROM users  WHERE fbuid='$fbuid'";
                $result = mysql_query($sql) or die(mysql_error());
                $u=mysql_fetch_array($result);
                if($u)
                    {
                        foreach($u as $title=> $value)
                            {
                                $this->${title} = $value;
                            }
                    }
                else
                    {
                        return FALSE;
                    }
                $this->_en   ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"false\" capitalize=\"true\" linked=\"false\" possessive=\"false\"></fb:name>";
                $this->_enp  ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"false\" capitalize=\"true\" linked=\"false\" possessive=\"true\"></fb:name>";
                $this->_enl  ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"false\" capitalize=\"true\" linked=\"true\" possessive=\"false\"></fb:name>";
                $this->_enpl ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"false\" capitalize=\"true\" linked=\"true\" possessive=\"true\"></fb:name>";
                $this->_fnl  ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"false\" capitalize=\"true\" firstnameonly=\"true\" linked=\"true\"></fb:name>";
                $this->_fnpl ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"false\" capitalize=\"true\" firstnameonly=\"true\" linked=\"true\" possessive=\"true\"></fb:name>";
                $this->_fn    ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"false\" capitalize=\"true\" firstnameonly=\"true\" linked=\"false\"></fb:name>";
                $this->_fnp  ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"false\" capitalize=\"true\" firstnameonly=\"true\" linked=\"false\" possessive=\"true\"></fb:name>";
                /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
                $this->_yen   ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"true\" capitalize=\"true\" linked=\"false\" possessive=\"false\"></fb:name>";
                $this->_yenp  ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"true\" capitalize=\"true\" linked=\"false\" possessive=\"true\"></fb:name>";
                $this->_yenl  ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"true\" capitalize=\"true\" linked=\"true\" possessive=\"false\"></fb:name>";
                $this->_yenpl ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"true\" capitalize=\"true\" linked=\"true\" possessive=\"true\"></fb:name>";
                $this->_yfnl  ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"true\" capitalize=\"true\" firstnameonly=\"true\" linked=\"true\"></fb:name>";
                $this->_yfnpl ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"true\" capitalize=\"true\" firstnameonly=\"true\" linked=\"true\" possessive=\"true\"></fb:name>";
                $this->_yfn   ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"true\" capitalize=\"true\" firstnameonly=\"true\" linked=\"false\"></fb:name>";
                $this->_yfnp  ="<fb:name uid=\"".$this->$fbuid."\" useyou=\"true\" capitalize=\"true\" firstnameonly=\"true\" linked=\"false\" possessive=\"true\"></fb:name>";
                $this->test  ="test";
            }

    }
$user = new user; 

On my library document:

include_once("lib/classes.php");
$db=new database();
$db->connect();
$user->getuser($fb_user); 

I have tested my database connection, and it is valid. The problem is that the page only loads if $fb_user is null. When it's not null say I set $user->getuser("12345678"); the page is just blank. No error messages or anything. Why is it doing this and how can I solve it?