Object In Object

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Hi,
Is this a good way ?
<?

class main{
    var $mysql;
    var $user;
    function main(){
        $this->mysql=new mysql();
        $this->user=new user();
    }
}

class Mysql
{
    function x(){ return "Some Query Result for ";}
}
class  user
{
    var $username;
    function user(){$this->username="Guest";}
}
/* Other subclasses */
class Data extends main{
    function getText(){
        echo $this->mysql->x();
        echo $this->user->username;
    }
}

$class=new main();
$data=new  Data();
$data->getText();

?>

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